Q_Id int64 337 49.3M | CreationDate stringlengths 23 23 | Users Score int64 -42 1.15k | Other int64 0 1 | Python Basics and Environment int64 0 1 | System Administration and DevOps int64 0 1 | Tags stringlengths 6 105 | A_Id int64 518 72.5M | AnswerCount int64 1 64 | is_accepted bool 2
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10,885,537 | 2012-06-04T17:34:00.000 | 5 | 0 | 1 | 0 | python,python-3.x,python-2.7 | 10,885,580 | 3 | false | 0 | 0 | Python 3.x's input is python 2.x's raw_input. The function has just been renamed since the old 2.x input was broken by design and therefore eliminated in 3.x. | 2 | 24 | 0 | I have tried a lot to run raw_input("") on the python console but that gives an error. Moreover I watch some videos that might have been made on old python. so input("") is the only method and why raw_input("") is discarded in the new version is there any reason ? | raw_input("") has been eliminated from python 3.2 | 0.321513 | 0 | 0 | 68,511 |
10,885,984 | 2012-06-04T18:07:00.000 | 2 | 0 | 0 | 0 | python,image-processing,python-imaging-library,rgb,pixel | 10,886,261 | 6 | false | 0 | 0 | As a basic optimization, it may save a little time if you create 3 lookup tables, one each for R, G, and B, to map the input value (0-255) to the output value (0-255). Looking up an array entry is probably faster than multiplying by a decimal value and rounding the result to an integer. Not sure how much faster.
Of cou... | 2 | 2 | 1 | I have an image that is created by using a bayer filter and the colors are slightly off. I need to multiply RG and B of each pixel by a certain factor ( a different factor for R, G and B each) to get the correct color. I am using the python imaging library and of course writing in python. is there any way to do this... | Multiply each pixel in an image by a factor | 0.066568 | 0 | 0 | 12,396 |
10,885,984 | 2012-06-04T18:07:00.000 | 0 | 0 | 0 | 0 | python,image-processing,python-imaging-library,rgb,pixel | 64,900,468 | 6 | false | 0 | 0 | If the type is numpy.ndarray just img = np.uint8(img*factor) | 2 | 2 | 1 | I have an image that is created by using a bayer filter and the colors are slightly off. I need to multiply RG and B of each pixel by a certain factor ( a different factor for R, G and B each) to get the correct color. I am using the python imaging library and of course writing in python. is there any way to do this... | Multiply each pixel in an image by a factor | 0 | 0 | 0 | 12,396 |
10,886,946 | 2012-06-04T19:16:00.000 | 2 | 0 | 1 | 0 | python,ipython | 35,548,911 | 6 | false | 0 | 0 | One of the useful answers was lost in the comments, so wanted to restate it along with adding a reference for another useful IPython magic function.
First to restate what @EOL said, one way to solve OP's problem is to turn off auto-indentation by first running %autoindent and doing the paste (not needed if you are usin... | 2 | 101 | 0 | I want to copy already indented Python code / whole functions and classes into IPython. Everytime I try the indentation is screwed up and I get following error message:
IndentationError: unindent does not match any outer indentation level (<ipython-input-23-354f8c8be51b>, line 12)
If you want to paste code into IPython... | How does IPython's magic %paste work? | 0.066568 | 0 | 0 | 69,070 |
10,886,946 | 2012-06-04T19:16:00.000 | 144 | 0 | 1 | 0 | python,ipython | 10,886,947 | 6 | true | 0 | 0 | You can't copy to IPython directly. This are the steps:
Copy the lines you want to copy into IPython into the clipboard
Enter %paste into IPython
Press enter
Profit! | 2 | 101 | 0 | I want to copy already indented Python code / whole functions and classes into IPython. Everytime I try the indentation is screwed up and I get following error message:
IndentationError: unindent does not match any outer indentation level (<ipython-input-23-354f8c8be51b>, line 12)
If you want to paste code into IPython... | How does IPython's magic %paste work? | 1.2 | 0 | 0 | 69,070 |
10,887,836 | 2012-06-04T20:23:00.000 | 1 | 0 | 0 | 1 | python,windows,performance,opencv | 12,700,150 | 2 | false | 0 | 0 | I had same issue and I found out that this is caused by prolonged exposure. It may be the case that Windows drivers increased exposure to increase brightness of picture. Try to point your camera to light source or manually set decreased exposure | 1 | 1 | 1 | I have build a simple webcam recorder on linux which works quite well.
I get ~25fps video and good audio.
I am porting the recorder on windows (win7) and while it works, it is unusable.
The QueryFrame function takes something more than 350ms, i.e 2.5fps.
The code is in python but the problem really seems to be the lib... | QueryFrame very slow on Windows | 0.099668 | 0 | 0 | 565 |
10,889,378 | 2012-06-04T22:39:00.000 | 8 | 0 | 1 | 0 | python | 10,889,432 | 2 | false | 0 | 0 | No, Python is not statically typed.
In static typing names are bound to both a type and an object (or value), in Python names are only bound to objects. At any time you can reassign a name to an object of a different type, which you cannot do in statically typed languages.
I'm not sure what you mean by needing declari... | 1 | 1 | 0 | I know Python is dynamic typed, duck typed and is also strong. In some cases, we have to make sure it is declare as a list or a dictionary beforehand in order to use them... so can I say Python is also statically typed language? | Is Python static typed? | 1 | 0 | 0 | 143 |
10,891,589 | 2012-06-05T04:32:00.000 | 1 | 0 | 1 | 0 | python,memory,large-data | 10,892,021 | 2 | true | 0 | 0 | Working with large datasets isn't necessarily going to cause memory complications. As long as you use sound approaches when you view and manipulate your data, you can typically make frugal use of memory.
There are two concepts you need to consider as you're building the models that process your data.
What is the smal... | 1 | 4 | 0 | I am working on a long running Python program (a part of it is a Flask API, and the other realtime data fetcher).
Both my long running processes iterate, quite often (the API one might even do so hundreds of times a second) over large data sets (second by second observations of certain economic series, for example 1-5M... | Iterating over a large data set in long running Python process - memory issues? | 1.2 | 0 | 0 | 2,438 |
10,893,554 | 2012-06-05T07:52:00.000 | 1 | 0 | 0 | 1 | python | 13,256,718 | 1 | false | 0 | 0 | Use logging.handlers.TimedRotatingFileHandler(filename, when='H', interval=1) | 1 | 0 | 0 | I have a function that makes calls to a logger almost every second, however, I only want to log information an hour before the logfile rotates. | TimedRotatingFileHandler: Log only when detected time to rotate | 0.197375 | 0 | 0 | 239 |
10,896,895 | 2012-06-05T11:59:00.000 | 0 | 0 | 0 | 0 | python,jython,grinder | 10,921,272 | 1 | false | 0 | 0 | More detail would be helpful. What information does a thread need before it can construct a valid pause request? Could the thread that sends the play request write this information into some module-level data structure? Then the thread that is doing the pause could read this information and build a valid request. | 1 | 0 | 0 | I want to create a script in which if a http request is being executed e.g, I have played a voicefile using a http operation Play() defined in my code.
In the mean time when the file is getting played , i want Pause() Operation to be called which can pause the file being played.
The problem I am facing is that, As th... | Multiple Threads doing different operations in a single Grinder Script | 0 | 0 | 1 | 219 |
10,897,239 | 2012-06-05T12:23:00.000 | 1 | 0 | 1 | 0 | python,linux | 10,897,423 | 1 | false | 0 | 0 | I used an editor that does code rollups and understood Python syntax, then I looked for rollups that are in unexpected locations. I don't remember if Kate does that. It's not obvious that there is an issue, but it makes it easier when you are looking for an issue. | 1 | 6 | 0 | (Warning: Potential flame-war starter. This is however not my goal, the point here is not to discuss the design choices of Python, but to know how to make the best out of it).
Is there a program, script, method (Unix-based, ideally), to display "virtual" brackets around blocs of code in Python, and to keep them where t... | Virtual brackets in Python | 0.197375 | 0 | 0 | 262 |
10,898,319 | 2012-06-05T13:33:00.000 | 0 | 0 | 1 | 0 | python,execute,shellexecute | 10,900,752 | 2 | false | 0 | 0 | put the line in a class then just call that class. This is what I would do rather than commenting out the lines.. | 2 | 1 | 0 | I have a simulation in python which I have run, but half way to the end I got an error. I have already fixed the error. Now I want to execute the same file, but beginning in the line of the error. How can I do that? Execfile, as far as I looked doesn't do that... | How do I execute a python file beginning in a specific code line? | 0 | 0 | 0 | 1,595 |
10,898,319 | 2012-06-05T13:33:00.000 | 5 | 0 | 1 | 0 | python,execute,shellexecute | 10,898,354 | 2 | true | 0 | 0 | You don't.
The easiest solution would be to comment out all the intervening lines, or put them inside an if False: block.
You could also simply save the appropriate portion of the code into a new file and run that instead.
Any of these operations should be trivial in most editors. | 2 | 1 | 0 | I have a simulation in python which I have run, but half way to the end I got an error. I have already fixed the error. Now I want to execute the same file, but beginning in the line of the error. How can I do that? Execfile, as far as I looked doesn't do that... | How do I execute a python file beginning in a specific code line? | 1.2 | 0 | 0 | 1,595 |
10,898,846 | 2012-06-05T14:05:00.000 | 5 | 0 | 0 | 0 | python,packet,icmp,scapy,ttl | 10,902,783 | 1 | true | 0 | 0 | What you're saying is essentially you can only test for so many unreachable hosts in a given span of time. One possible reason: many routers rate-limit ICMP messages.
It is much better to test for a ping success to a host before doing something else; this way you have positive confirmation of reachability. The downsi... | 1 | 6 | 0 | I'm using Scapy to replay some dumped packets in which I change the TTL value. I've been getting very odd results even with TTL=1.
When I run my test hours apart from each other, I can get from roughly 40% to 95% of packets replied to with an ICMP time-exceeded message. Then I can recursively replay unanswered packe... | not getting all ICMP time-exceeded messages: why? | 1.2 | 0 | 0 | 1,531 |
10,899,192 | 2012-06-05T14:26:00.000 | 0 | 0 | 0 | 0 | javascript,python,html,automation | 10,899,256 | 3 | false | 1 | 0 | I think it will be easier for you get program like autoit. | 1 | 2 | 0 | Every Monday at Work, I have the task of printing out Account analysis (portfolio analysis) and Account Positions for over 50 accounts. So i go to the page, click "account analysis", enter the account name, click "format this page for printing", Print the output (excluding company disclosures), then I go back to the ac... | Automating HTTP navigation and HTML printing using Python | 0 | 0 | 1 | 773 |
10,900,319 | 2012-06-05T15:34:00.000 | 0 | 0 | 0 | 0 | python,sqlite,web | 10,900,387 | 2 | false | 0 | 0 | I suggest you look in the log of your server to find out what caused the 500 error. | 1 | 0 | 0 | Using CGI scripts, I can run single Python files on my server and then use their output on my website.
However, I have a more complicated program on my computer that I would like to run on the server. It involves several modules I have written myself, and the SQLITE3 module built in Python. The program involves readin... | Importing Python files into each other on a web server | 0 | 1 | 0 | 88 |
10,900,852 | 2012-06-05T16:09:00.000 | 0 | 0 | 0 | 0 | python,random,seed | 10,901,418 | 6 | false | 0 | 0 | First: define similarity. Next: code a similarity test. Then: check for similarity.
With only a vague description of similarity it is hard to check for it. | 3 | 12 | 1 | I'm using sequential seeds (1,2,3,4,...) for generation of random numbers in a simulation. Does the fact that the seeds are near each other make the generated pseudo-random numbers similar as well?
I think it doesn't change anything, but I'm using python
Edit: I have done some tests and the numbers don't look similar. ... | May near seeds in random number generation give similar random numbers? | 0 | 0 | 0 | 2,871 |
10,900,852 | 2012-06-05T16:09:00.000 | 0 | 0 | 0 | 0 | python,random,seed | 10,904,377 | 6 | false | 0 | 0 | What kind of simulation are you doing?
For simulation purposes your argument is valid (depending on the type of simulation) but if you implement it in an environment other than simulation, then it could be easily hacked if it requires that there are security concerns of the environment based on the generated random nu... | 3 | 12 | 1 | I'm using sequential seeds (1,2,3,4,...) for generation of random numbers in a simulation. Does the fact that the seeds are near each other make the generated pseudo-random numbers similar as well?
I think it doesn't change anything, but I'm using python
Edit: I have done some tests and the numbers don't look similar. ... | May near seeds in random number generation give similar random numbers? | 0 | 0 | 0 | 2,871 |
10,900,852 | 2012-06-05T16:09:00.000 | 0 | 0 | 0 | 0 | python,random,seed | 10,905,149 | 6 | false | 0 | 0 | To quote the documentation from the random module:
General notes on the underlying Mersenne Twister core generator:
The period is 2**19937-1.
It is one of the most extensively tested generators in existence.
I'd be more worried about my code being broken than my RNG not being random enough. In general, your gut fe... | 3 | 12 | 1 | I'm using sequential seeds (1,2,3,4,...) for generation of random numbers in a simulation. Does the fact that the seeds are near each other make the generated pseudo-random numbers similar as well?
I think it doesn't change anything, but I'm using python
Edit: I have done some tests and the numbers don't look similar. ... | May near seeds in random number generation give similar random numbers? | 0 | 0 | 0 | 2,871 |
10,901,161 | 2012-06-05T16:29:00.000 | 9 | 0 | 1 | 0 | python | 10,901,272 | 4 | false | 0 | 0 | Python 3.3 included an optimization for Unicode strings that reduced their memory consumption. That might translate into faster code if more of it fits into cache.
Really the only way to know is to benchmark your most critical code in both and see what the difference is. | 2 | 35 | 0 | I've looked around for answers and much seems to be old or outdated. Has Python 3 been updated yet so that it's decently faster than Python 2.7 or am I still better off sticking with my workable code? | Python 2.7 or Python 3 (for speed)? | 1 | 0 | 0 | 38,853 |
10,901,161 | 2012-06-05T16:29:00.000 | 5 | 0 | 1 | 0 | python | 10,901,390 | 4 | false | 0 | 0 | The necessity of Libraries for your applications will determine whether Python3 or Pyhton2 is better. | 2 | 35 | 0 | I've looked around for answers and much seems to be old or outdated. Has Python 3 been updated yet so that it's decently faster than Python 2.7 or am I still better off sticking with my workable code? | Python 2.7 or Python 3 (for speed)? | 0.244919 | 0 | 0 | 38,853 |
10,902,671 | 2012-06-05T18:21:00.000 | 7 | 0 | 1 | 0 | python,cocoa,py2app,scripting-bridge | 10,903,455 | 1 | true | 0 | 0 | The short version: PyObjC is the way you call Mac OS X APIs, Scripting Bridge is the way you talk to other apps' scripting interfaces. In more detail:
PyObjC is a bridge between the Python language and the Objective C runtime (and the set of Cocoa wrappers built trivially on top of that bridge, and some nice convenienc... | 1 | 6 | 0 | I am just starting to learn about integrating Python and Mac OS apps. (I want to call some methods from Cocoa to Python.) I've ran into these terminologies -- Scripting Bridge, PyObjC, and py2app. What's the difference? Is PyObjC an example of a scripting bridge? And when does py2app come into play? | Scripting Bridge vs PyObjC vs py2app | 1.2 | 0 | 0 | 1,241 |
10,904,721 | 2012-06-05T20:49:00.000 | 11 | 1 | 1 | 1 | python,operating-system | 10,905,302 | 4 | false | 0 | 0 | I suggest you find a good textbook on operating system design, and study that. I'm pretty sure you won't find such a book with Python source code; C is more likely. (You might find an older textbook that uses Pascal instead of C, but it's really not that different.)
Once you have studied operating systems design enou... | 1 | 38 | 0 | Is it possible to make a minimalistic operating system using Python?
I really don't want to get into low-level code like assembly, so I want to use a simple language like Perl, Python. But how? | Is it possible to create an operating system using Python? | 1 | 0 | 0 | 76,823 |
10,906,198 | 2012-06-05T23:01:00.000 | 0 | 1 | 0 | 1 | python,exe,dmg | 10,906,453 | 1 | false | 1 | 0 | If you mean specifically with Python, as I gather from tagging that in your question, it won't simply run the same way as Java will, because there's no equivalent Virtual Machine.
If the user has a Python interpreter on their system, they they can simply run the .py file.
If they do not, you can bundle the interpreter ... | 1 | 0 | 0 | Newbie question I am finding it hard to get my head around.
If I wanted to use one of the many tool out their like rsync lsync or s3cmd how can you build these into a program for none computer savvy people to use.
Ie I am comfortable opening terminal and running s3cmd which Is developed in python how would I go about d... | Compiling and running code as dmg or exe | 0 | 0 | 0 | 1,925 |
10,906,477 | 2012-06-05T23:41:00.000 | 2 | 0 | 0 | 0 | python,pyramid | 10,907,158 | 1 | false | 1 | 0 | Pyramid has nothing to do with it. The global needs to handle whatever mechanism the WSGI server is using to serve your application.
For instance, most servers use a separate thread per request, so your global variable needs to be threadsafe. gunicorn and gevent are served using greenlets, which is a different mechanic... | 1 | 2 | 0 | It looks like this is what e.g. MongoEngine does. The goal is to have model files be able to access the db without having to explicitly pass around the context. | In Pyramid, is it safe to have a python global variable that stores the db connection? | 0.379949 | 1 | 0 | 877 |
10,908,715 | 2012-06-06T05:42:00.000 | 1 | 0 | 0 | 0 | python,bots,google-finance | 10,908,773 | 1 | false | 1 | 0 | well, you finally reached a quite challenging realm. decode the captcha.
there do exist OCR approaches to decode simple captcha into code. not seems to work for google captcha.
I heard there are some companies provide manual captcha decoding services, you can try to use some. ^_^ LOL
ok, to be serious, if google don'... | 1 | 1 | 0 | I wrote a script that retrieves stock data on google finance and prints it out, nice and simple. It always worked, but since this morning I only get a page that tells me that I'm probably an automated script instead of the stock data. Of course, being a script, I can't pass the captcha. What can I do? | Google Finance recognizes my Python script as a bot and blocks it | 0.197375 | 0 | 1 | 1,173 |
10,909,812 | 2012-06-06T07:20:00.000 | 0 | 0 | 0 | 0 | python,plone | 10,913,922 | 3 | false | 1 | 0 | If you're running out of other ideas, you can copy them in using WebDAV access. (Be aware, though, to pack the database afterwards: while Plone4 has blob support, I think files uploaded via WebDAV leave a stale copy in the database.) | 1 | 1 | 0 | I want to implement DMS for the existing files on my File system. How do I import such existing files / images into my Plone DMS. I don't wish to use Products.Reflecto as I am unable to add any version control/ edit the uploaded files, images in it. | How to migrate large data from any file system to a plone site plone 4.1? | 0 | 0 | 0 | 280 |
10,910,246 | 2012-06-06T07:55:00.000 | 0 | 0 | 0 | 0 | python,sql,string,mysql-python | 10,910,268 | 2 | false | 0 | 0 | No, other than the string can contain newlines. | 1 | 1 | 0 | is there a difference if i use """..""" in the sql of cusror.execute. Even if there is any slight difference please tell | What is the use of """...""" in python instead of "..." or '...', especially in MySQLdb cursor.execute | 0 | 1 | 0 | 125 |
10,910,591 | 2012-06-06T08:21:00.000 | 2 | 0 | 0 | 1 | google-app-engine,python-2.7 | 10,910,709 | 2 | false | 1 | 0 | Put a main file in the top-level directory and import all your handlers there, then reference them via that file | 1 | 3 | 0 | I am trying to migrate my app and everything worked fine until I changed in app.yaml
from threadsafe: false to threadsafe: true.
The error I was receiving was:
threadsafe cannot be enabled with CGI handler: a/b/xyz.app
After some googling I found:
Only scripts in the top-level directory work as handlers, so if you hav... | Migrating GAE app from python 2.5 to 2.7 | 0.197375 | 0 | 0 | 335 |
10,911,789 | 2012-06-06T09:46:00.000 | 6 | 1 | 0 | 0 | java,python,osgi | 10,928,722 | 1 | false | 0 | 0 | The purpose of OSGi is to write (reusable) active modules that can discover each other at runtime so that these modules can decide to collaborate. The primary mechanism is the service registry that acts as a simple broker for objects.
A similar mechanism exists in JavaScript with the exports global variable. Unlike th... | 1 | 4 | 0 | While trying to understand what problem does OSGI solve in the java ecosystem ,i find myself wondering if there is such a problem in python as well ? if yes how it is solved , if no why ? | is there a requirement in python similar to what osgi tries to solve in java ? | 1 | 0 | 0 | 908 |
10,911,878 | 2012-06-06T09:52:00.000 | 1 | 0 | 0 | 0 | python,twitter-bootstrap,flask | 10,926,171 | 1 | false | 1 | 0 | To re-use a chunk of HTML, you can use Jinja's {% include %} tag. If that's too limiting, Jinja macros are also well suited. You can define your macros in a separate file and import them with {% import "path/to/macros.html" as my_macros %}.
Flask-Assets can help with the organisation of your assets.
As for using Bluepr... | 1 | 5 | 0 | I have a page (located at /games/compare/) and it's a mini image comparison game. Users are shown two images and asked to pick between them in response to a question. This page can get images from the database, render a template with javascript and css inside and communicate back to the database using AJAX.
Now what if... | Embed Flask page in another without code duplication? | 0.197375 | 0 | 0 | 909 |
10,912,706 | 2012-06-06T10:48:00.000 | 4 | 0 | 0 | 0 | python,django,image,internationalization | 10,912,731 | 5 | false | 1 | 0 | You could pass a language parameter to your page template and use it as part of your media file URL.
This would require you to host all media files for, e.g., English in a folder SITE_MEDIA/english, while other, e.g., Japanese images would be available from SITE_MEDIA/japanese.
Inside your page templates, you could the... | 1 | 3 | 0 | How would I implement different images from static folder based on language?
For example, when visiting the main site the layout will load in english but when changed to japanese the logo and images attached to the layout will change based on the requested language. please help..... | Internationalizing images in django | 0.158649 | 0 | 0 | 1,446 |
10,914,740 | 2012-06-06T13:01:00.000 | 2 | 0 | 0 | 1 | python,internet-explorer,real-time,twisted,server-sent-events | 10,949,657 | 1 | true | 1 | 0 | Answering my own question is a little weird. But I just found the answer. I had to go with long polling. looks like, I have to write a framework which falls-back to long polling when server sent events are not supported. Answering just in case anyone comes for reference in future. | 1 | 2 | 0 | I am working on a project that requires real time update. So, long ago, I decided to go with using Twisted SSE Handler (cyclone.sse). The project is at an end. And all the pub/sub stuff is good on all the browsers except Internet Explorer. IE doesn't support SSE. How do I get pub-sub working on IE without change of cod... | Twisted Server Sent Events accessing using Internet Explorer | 1.2 | 0 | 0 | 431 |
10,918,002 | 2012-06-06T16:10:00.000 | 0 | 0 | 0 | 0 | python,django,django-forms,monkeypatching | 11,048,847 | 2 | true | 1 | 0 | The solution here was to copy the package to my application folder and patch it locally. | 2 | 1 | 0 | I have an app included into INSTALLED_APPS that needs to be monkey-patched.
The problem is that I don't explicitly import modules from this app (django-allauth).
Is there any way to get some access at the point when Django imports an application
and monkey patch one of it's internal forms?
Which in my case would be so... | Monkey patch form in INSTALLED_APPS | 1.2 | 0 | 0 | 259 |
10,918,002 | 2012-06-06T16:10:00.000 | -1 | 0 | 0 | 0 | python,django,django-forms,monkeypatching | 10,918,221 | 2 | false | 1 | 0 | import ipdb; ipdb.set_trace() in the __init__ of the module. And write the char "w" to see the trace | 2 | 1 | 0 | I have an app included into INSTALLED_APPS that needs to be monkey-patched.
The problem is that I don't explicitly import modules from this app (django-allauth).
Is there any way to get some access at the point when Django imports an application
and monkey patch one of it's internal forms?
Which in my case would be so... | Monkey patch form in INSTALLED_APPS | -0.099668 | 0 | 0 | 259 |
10,918,905 | 2012-06-06T17:11:00.000 | 1 | 0 | 0 | 1 | python,django,cron,celery | 10,918,986 | 2 | true | 1 | 0 | In my personal opinion, i would learn how to use cron. This won't take more than 5 to 10 minutes, and it's an essential tool when working on a Linux server.
What you could do is set up a cronjob that requests one page of your django instance every minute, and have the django script figure out what time it is and what n... | 1 | 3 | 0 | I'd like to run periodic tasks on my django project, but I don't want all the complexity of celery/django-celery (with celerybeat) bundled in my project.
I'd like, also, to store the config with the times and which command to run within my SCM.
My production machine is running Ubuntu 10.04.
While I could learn and use ... | Cron-like scheduler, something between cron and celery | 1.2 | 0 | 0 | 1,859 |
10,919,301 | 2012-06-06T17:40:00.000 | 3 | 0 | 0 | 1 | python,github,jenkins | 10,919,450 | 2 | false | 1 | 0 | The solution is quite simple: make cleaner commits (fix typos before committing, only commit changes that belong together, not for too small edits). It's a bit odd that you don't take the time to fix typos (by running/testing locally) but wish to reduce the number of commits by some other means. | 2 | 1 | 0 | I have a standard-ish setup. Call it three servers - www, app and db, all fed from fabric scripts, and the whole on github.
I have a local laptop with the repo clone. I change a file locally, and push it to github then deploy using jenkins - which pulls from github and does its business. The problem here is I can pu... | As part of development, I am committing to github and pulling down and executing elsewhere. It feels wrong | 0.291313 | 0 | 0 | 97 |
10,919,301 | 2012-06-06T17:40:00.000 | 0 | 0 | 0 | 1 | python,github,jenkins | 10,920,164 | 2 | true | 1 | 0 | The solution is to not use github / jenkins to deploy to the servers.
The servers should be seen as part of the 'local' deployment (local being pre-commit)
So use the fab files directly, from my laptop.
That was harder because of pre processing occuring on jenkins but that is replicable.
So, I shall take Jeff Atwoods a... | 2 | 1 | 0 | I have a standard-ish setup. Call it three servers - www, app and db, all fed from fabric scripts, and the whole on github.
I have a local laptop with the repo clone. I change a file locally, and push it to github then deploy using jenkins - which pulls from github and does its business. The problem here is I can pu... | As part of development, I am committing to github and pulling down and executing elsewhere. It feels wrong | 1.2 | 0 | 0 | 97 |
10,920,199 | 2012-06-06T18:43:00.000 | 0 | 0 | 0 | 0 | python,metrics,recommendation-engine,personalization,cosine-similarity | 10,955,138 | 2 | false | 0 | 0 | Recommender systems in the land of research generally work on a scale of 1 - 5. It's quite nice to get such an explicit signal from a user. However I'd imagine the reality is that most users of your system would never actually give a rating, in which case you have nothing to work with.
Therefore I'd track page views b... | 2 | 0 | 1 | I'm looking to implement an item-based news recommendation system. There are several ways I want to track a user's interest in a news item; they include: rating (1-5), favorite, click-through, and time spent on news item.
My question: what are some good methods to use these different metrics for the recommendation syst... | Recommendation system - using different metrics | 0 | 0 | 0 | 614 |
10,920,199 | 2012-06-06T18:43:00.000 | 0 | 0 | 0 | 0 | python,metrics,recommendation-engine,personalization,cosine-similarity | 10,956,591 | 2 | false | 0 | 0 | For recommendation system, there are two problems:
how to quantify the user's interest in a certain item based on the numbers you collected
how to use the quantified interest data to recommend new items to the user
I guess you are more interested in the first problem.
To solve the first problem, you need either linea... | 2 | 0 | 1 | I'm looking to implement an item-based news recommendation system. There are several ways I want to track a user's interest in a news item; they include: rating (1-5), favorite, click-through, and time spent on news item.
My question: what are some good methods to use these different metrics for the recommendation syst... | Recommendation system - using different metrics | 0 | 0 | 0 | 614 |
10,920,423 | 2012-06-06T18:58:00.000 | 5 | 0 | 0 | 0 | python,django,mercurial,pyc | 10,920,888 | 4 | false | 1 | 0 | Usually you are safe, because *.pyc are regenerated if the corresponding *.py changes its content.
It is problematic if you delete a *.py file and you are still importing from it in another file. In this case you are importing from the *.pyc file if it is existing. But this will be a bug in your code and is not really ... | 2 | 7 | 0 | Just started to use Mercurial. Wow, nice application. I moved my database file out of the code directory, but I was wondering about the .pyc files. I didn't include them on the initial commit. The documentation about the .hgignore file includes an example to exclude *.pyc, so I think I'm on the right track.
I am wonde... | What to do with pyc files when Django or python is used with Mercurial? | 0.244919 | 1 | 0 | 8,119 |
10,920,423 | 2012-06-06T18:58:00.000 | 0 | 0 | 0 | 0 | python,django,mercurial,pyc | 10,920,511 | 4 | false | 1 | 0 | Sure if you have a .pyc file from an older version of the same module python will use that. Many times I have wondered why my program wasn't reflecting the changes I made, and realized it was because I had old pyc files.
If this means that .pyc are not reflecting your current version then yes you will have to delete a... | 2 | 7 | 0 | Just started to use Mercurial. Wow, nice application. I moved my database file out of the code directory, but I was wondering about the .pyc files. I didn't include them on the initial commit. The documentation about the .hgignore file includes an example to exclude *.pyc, so I think I'm on the right track.
I am wonde... | What to do with pyc files when Django or python is used with Mercurial? | 0 | 1 | 0 | 8,119 |
10,920,488 | 2012-06-06T19:03:00.000 | 1 | 0 | 1 | 0 | python,duplicate-removal | 10,920,591 | 3 | false | 0 | 0 | use fslint or some similar software. Fslint is able to for example give you a list of the different files and hardlink the copies together, or delete the duplicates. One option is also to just use a diff-like program to diff the directories if their internal structure is the same. | 3 | 2 | 0 | I have a directory of files that contain files of records. I just got access to a new directory that has the same records but additional files as well, but the additional files are buried deep inside other folders and i cant find them.
So my solution would be to have a python program run and delete all files that are ... | Search multiple directories, delete duplicate files | 0.066568 | 0 | 0 | 447 |
10,920,488 | 2012-06-06T19:03:00.000 | 0 | 0 | 1 | 0 | python,duplicate-removal | 10,922,803 | 3 | false | 0 | 0 | Do they duplicate files in both directories have the same name/path? If I understand correctly you want to find the duplicate filenames rather than file contents? If so, a 'synchronised' call to os.walk in both trees might be helpful. | 3 | 2 | 0 | I have a directory of files that contain files of records. I just got access to a new directory that has the same records but additional files as well, but the additional files are buried deep inside other folders and i cant find them.
So my solution would be to have a python program run and delete all files that are ... | Search multiple directories, delete duplicate files | 0 | 0 | 0 | 447 |
10,920,488 | 2012-06-06T19:03:00.000 | 1 | 0 | 1 | 0 | python,duplicate-removal | 10,920,575 | 3 | false | 0 | 0 | Possible approach:
Create a set of MD5 hashes from your original folder.
Recursively MD5 hash the files in your new folder, deleting any files that generate hashes already present in your set.
Caveat to the above is that there is a chance two different files can generate the same hash. How different are the files? | 3 | 2 | 0 | I have a directory of files that contain files of records. I just got access to a new directory that has the same records but additional files as well, but the additional files are buried deep inside other folders and i cant find them.
So my solution would be to have a python program run and delete all files that are ... | Search multiple directories, delete duplicate files | 0.066568 | 0 | 0 | 447 |
10,921,655 | 2012-06-06T20:22:00.000 | 0 | 0 | 1 | 0 | python,enthought | 10,921,702 | 2 | false | 0 | 0 | The problem is that you don't have the library scipy installed, which is a totally different library of epdfree.
you can install it from apt-get in linux I guess, or going to their website
www.scipy.org | 2 | 0 | 1 | I am trying to install epdfree on two virtually identical machines: Linux 2.6.18-308.1.1.el5, CentOS release 5.8., 64-bit machines. (BTW, I'm a bit new to python.)
After the install on one machine, I run python and try to import scipy. Everything goes fine.
On the other machine, I follow all the same steps as far as ... | trouble with installing epdfree | 0 | 0 | 0 | 242 |
10,921,655 | 2012-06-06T20:22:00.000 | 1 | 0 | 1 | 0 | python,enthought | 10,922,030 | 2 | true | 0 | 0 | Well, turns out there was one difference. File permissions were being set differently on the two machines. I installed epdfree as su on both machines. On the second machine, everything was locked out when I tried to run it without going under "su". Now my next task is to find out why the permissions were set differ... | 2 | 0 | 1 | I am trying to install epdfree on two virtually identical machines: Linux 2.6.18-308.1.1.el5, CentOS release 5.8., 64-bit machines. (BTW, I'm a bit new to python.)
After the install on one machine, I run python and try to import scipy. Everything goes fine.
On the other machine, I follow all the same steps as far as ... | trouble with installing epdfree | 1.2 | 0 | 0 | 242 |
10,922,394 | 2012-06-06T21:13:00.000 | 0 | 0 | 0 | 0 | python,sqlite,copy | 10,922,927 | 1 | false | 0 | 0 | You did a .backup on the source system, but you don't mention doing a .restore on the target system. Please clarify.
You don't mention what versions of the sqlite3 executable you have on the source and target systems.
You don't mention how you transferred the .bak file from the source to the target.
Was the source db b... | 1 | 0 | 0 | I have a sqlite3 database that I created from Python (2.7) on a local machine, and am trying to copy it to a remote location. I ran "sqlite3 posts.db .backup posts.db.bak" to create a copy (I can use the original and this new copy just fine). But when I move the copied file to the remote location, suddenly every comman... | How to safely move an SQLite3 database? | 0 | 1 | 0 | 624 |
10,922,849 | 2012-06-06T21:53:00.000 | 0 | 0 | 1 | 0 | python,arrays,numpy | 10,922,884 | 3 | false | 0 | 0 | What you are doing sounds fine for the object arrays, that's really the only way to get an average. As for the average of all the elements in A, just add each average as you iterate through the list, and then divide by the total number of objects in A | 1 | 0 | 0 | Python question.
I have a list (A) of numpy object arrays (B). I'd like to get the mean of one of the object variables for all the objects in the B array. Right now, I'm just parsing through the B array, summing the variable and dividing it by the number of objects in B. Is there a better or more pythonic way to do th... | Mean of object variables in a python array | 0 | 0 | 0 | 674 |
10,924,309 | 2012-06-07T00:51:00.000 | 3 | 1 | 0 | 1 | python,linux,service | 10,924,388 | 2 | false | 0 | 0 | The cron job is probably a good approach in general, as the shell approach requires manual intervention to start it.
A couple of suggestions:
You could use a lock file to ensure that the cron job only ever starts one instance of the python script - often problems occur when using cron for larger jobs because it start... | 1 | 2 | 0 | I have a small python script that creates a graph of data pulled from MySQL. I'm trying to figure out a way to run the script in the background all time on a regular basis. I've tried a number of things:
A Cron Job that runs the script
A loop timer
Using the & command to run the script in the background
These all hav... | How can I run my python script in the background on a schedule? | 0.291313 | 0 | 0 | 7,997 |
10,928,948 | 2012-06-07T09:16:00.000 | 2 | 0 | 1 | 0 | python,tox | 10,928,950 | 1 | true | 0 | 0 | Use TERM=dumb on the command line if you want to disable the colors but don't know about changing the colors. | 1 | 0 | 0 | When using tox by default it will output colours to the terminal which is actually fine if you using a white background terminal but hard to see with a dark terminal. Is there any tricks to disable colours in tox without hacking the code directly? | How to disable or change colors from tox output | 1.2 | 0 | 0 | 682 |
10,929,285 | 2012-06-07T09:39:00.000 | 0 | 0 | 0 | 0 | python,qt,checkbox,combobox,pyqt | 10,930,835 | 1 | true | 0 | 1 | You can do this using the model->view framework, but it means implementing a custom model to support checkable data.
You create a custom model by subclassing QAbstractItemModel. This presents an API to the QComboBox for accessing the underlying data. Off the top of my head I think you'll need to implement the flags met... | 1 | 0 | 0 | I'm new to PyQt and I have to work on an application which use it. For the moment, I don't have any problem, but I'm stuck on something. I have to create a "ComboBox with its items checkable, like a CheckBox". This ComboBox should contain many image format, like "jpg", "exr" or "tga", and I will have to pick up the tex... | How to simply create a list of CheckBox which has a dropdown list like a ComboBox with PyQt? | 1.2 | 0 | 0 | 1,527 |
10,930,459 | 2012-06-07T11:00:00.000 | 1 | 0 | 0 | 0 | python,mysql,django | 10,935,789 | 2 | false | 1 | 0 | You could use a middleware with a process_view method and a try / except wrapping your call.
Or you could decorate your views and wrap the call there.
Or you could use class based views with a base class that has a method decorator on its dispatch method, or an overriden.dispatch.
Really, you have plenty of solutions.... | 1 | 1 | 0 | I have a desktop application that send POST requests to a server where a django app store the results. DB server and web server are not on the same machine and it happens that sometimes the connectivity is lost for a very short time but results in a connection error on some requests:
OperationalError: (2003, "Can't co... | Django: how to properly handle a database connection error | 0.099668 | 1 | 0 | 2,536 |
10,931,481 | 2012-06-07T12:08:00.000 | -1 | 0 | 1 | 0 | python,pyopengl | 10,932,247 | 2 | false | 0 | 0 | You need to download and install the 32 bit version of python 2.7 .
you can have both 32 and 64 bit python on you sys at the same time, with no ill-effects.
When you see a python library that is 32 bit, in my experience, you need 32 bit python. to my knowledge, 32 bit libraries will not work with 64 bit python install... | 1 | 1 | 0 | I'm a new to Python.
I have installed Python 2.7 64 bit on Win7 64 bit machine. Now I want to install PyOpenGL but there is only win32 version available. When I'm trying to install PyOpenGL is says "No Python installation found in registry"
How do I proceed form here now? | Python 2.7 64 bit and PyOpenGL-3.0.1.win32 installation | -0.099668 | 0 | 0 | 5,355 |
10,931,889 | 2012-06-07T12:34:00.000 | 1 | 0 | 0 | 0 | python,mongodb,mongoalchemy,nosql | 10,932,004 | 4 | false | 1 | 0 | What I would do with mongodb would be to embed the user id into the comments (which are part of the structure of the "post" document).
Three simple hints for better performances:
1) Make sure to ensure an index on the user_id
2) Use comment pagination method to avoid querying 200 times the database
3) Caching is your f... | 1 | 3 | 0 | I cant find "best" solution for very simple problem(or not very)
Have classical set of data: posts that attached to users, comments that attached to post and to user.
Now i can't decide how to build scheme/classes
On way is to store user_id inside comments and inside.
But what happens when i have 200 comments on page?
... | MongoDB: Embedded users into comments | 0.049958 | 1 | 0 | 919 |
10,937,081 | 2012-06-07T17:48:00.000 | 2 | 0 | 0 | 0 | python,sungridengine,drmaa | 14,248,534 | 1 | false | 0 | 0 | From an DRMAA API point of view, there is no better way. The API simply reflects what you are able to do in a shell script with the default command-line tools.
The problem lies in the implementation strategy of your particular DRMAA library, since SGE offers better ways than constant polling to get job status updates.Y... | 1 | 0 | 0 | I wanted to ask about "wait" feature in drmaa API I am using through Python. Does it do constant qstat's ( if we are running it on SGE) to check whether a program has finished execution.
Our admin want us to avoid any constant qstat's as it slows down the performance due to extra load on scheduler.
In general wat woul... | efficient way to wait for job completion : python and drmaa | 0.379949 | 0 | 0 | 844 |
10,937,861 | 2012-06-07T18:39:00.000 | 1 | 0 | 0 | 0 | python,dropbox | 10,937,959 | 2 | true | 0 | 0 | If the script is gonna run every 10 minutes, EC2 etc. won't do you any good since they are priced based on 15-minute time slices (and the server will always be used).
The cheapest solution is a small VPS, which can be found for as little as 5$ / month from some providers. Install dropbox & python and you're good to go. | 1 | 0 | 0 | I wrote a python script which downloads data via the Yahoo! Finance API and puts it into a file. After that, it uploads the file to Dropbox. The script does that every 10 minutes.
How can I implement this at a minimal cost with a server? I don't want to let my computer run 24/7.
Thank you in advance! | How to run a python script and upload the generated to dropbox on a server? | 1.2 | 0 | 1 | 729 |
10,938,360 | 2012-06-07T19:12:00.000 | 39 | 0 | 0 | 0 | python,flask,wsgi,gunicorn | 10,943,523 | 4 | false | 1 | 0 | Flask will process one request per thread at the same time. If you have 2 processes with 4 threads each, that's 8 concurrent requests.
Flask doesn't spawn or manage threads or processes. That's the responsability of the WSGI gateway (eg. gunicorn). | 2 | 184 | 0 | I'm building an app with Flask, but I don't know much about WSGI and it's HTTP base, Werkzeug. When I start serving a Flask application with gunicorn and 4 worker processes, does this mean that I can handle 4 concurrent requests?
I do mean concurrent requests, and not requests per second or anything else. | How many concurrent requests does a single Flask process receive? | 1 | 0 | 0 | 143,304 |
10,938,360 | 2012-06-07T19:12:00.000 | 9 | 0 | 0 | 0 | python,flask,wsgi,gunicorn | 10,942,272 | 4 | false | 1 | 0 | No- you can definitely handle more than that.
Its important to remember that deep deep down, assuming you are running a single core machine, the CPU really only runs one instruction* at a time.
Namely, the CPU can only execute a very limited set of instructions, and it can't execute more than one instruction per cloc... | 2 | 184 | 0 | I'm building an app with Flask, but I don't know much about WSGI and it's HTTP base, Werkzeug. When I start serving a Flask application with gunicorn and 4 worker processes, does this mean that I can handle 4 concurrent requests?
I do mean concurrent requests, and not requests per second or anything else. | How many concurrent requests does a single Flask process receive? | 1 | 0 | 0 | 143,304 |
10,939,138 | 2012-06-07T20:11:00.000 | 0 | 0 | 1 | 0 | python,xml,json,standards,dsl | 46,526,632 | 3 | false | 0 | 0 | In the end, I implemented a simple interpreter in Python, using S-expressions. Parsers are easy to find online (about half a page of code) and implementing functions for the language can be made simple by use of function decorators. | 1 | 1 | 0 | XML is a good file format for storing documents: content with metadata. JSON is a good file format for storing data.
Is there an analogous file format standard which is good at encoding operations? In other words, is there a standard file format which would be good for encoding small light-weight domain-specific lang... | Domain Specific Language, Standard File Format | 0 | 0 | 1 | 615 |
10,940,349 | 2012-06-07T21:47:00.000 | 1 | 0 | 1 | 0 | c#,python,multithreading,dll,activex | 10,952,585 | 2 | false | 0 | 0 | I haven't worked with Phyton, but for C# I would suggest creating a helper class that contains the ActiveX as a static public property. Have the main thread create the ActiveX and then from there all threads access it as needed. | 1 | 1 | 0 | I have an ActiveX (COM) DLL that makes windows system calls (such as ReadFile() and WriteFile()). My GUIs (in Python or C#) create an instance of the DLL in the main GUI thread. However, in order to make calls to it from threads, a new instance of the DLL must be created in each thread, regardless of using C# or Python... | ActiveX DLL called from thread | 0.099668 | 0 | 0 | 1,250 |
10,941,830 | 2012-06-08T00:51:00.000 | 2 | 0 | 1 | 0 | python,python-3.x | 10,943,105 | 4 | false | 0 | 0 | I put an import pdb;pdb.set_trace() in the relevant place, and once in the debugger I use dir(), .__dict__ and pp, or any other forms of inspection necessary. | 1 | 1 | 0 | I am a noob to Python.
I constantly find myself looking at a piece of code and trying to work out what is inside a data structure such as for example a dictionary. In fact the first thing I am trying to work out is "what sort of data structure is this?" and THEN I try to work out how to see what is inside it. I look ... | How do the Python masters recognise and examine contents of Python 3 data structures? | 0.099668 | 0 | 0 | 237 |
10,942,469 | 2012-06-08T02:44:00.000 | 0 | 0 | 0 | 0 | python,firebug,web-scraping | 10,942,524 | 2 | false | 1 | 0 | If the answer's not in the source code (possibly obfuscated, encoded, etc), then it was probably retrieved after the page loaded with an XmlHTTPRequest. You can use the 'network' panel in Firebug to see what other pieces of data the page loaded, and what requests it made to load them.
(You may have to enable the netwo... | 1 | 0 | 0 | I am trying to scrape a website, but the thing that I want to get is not in the source code. But it does appear when i use firebug. Is there a way to scrape from the firebug code as opposed to the source code? | Scraping a website in python with firebug? | 0 | 0 | 1 | 1,907 |
10,948,636 | 2012-06-08T12:12:00.000 | 1 | 0 | 0 | 0 | python | 10,950,787 | 1 | true | 1 | 0 | In general your application is using wsgi compliant framework and you shouldn't be afraid of multi-threaded / single-threaded server side. It's meant to work transparent and has to react same way despite of what kind of server is it, as long as it is wsgi compliant.
Every code block before bottle.run() will be run only... | 1 | 1 | 0 | I am developing an application with the bottlepy framework. I am using the standard library WSGIRefServer() to run a development server. It is a single threaded server.
Now when going into production, I will want to move to a multi-threaded production server, and there are many choices. Let's say I choose CherryPy.
Now... | Python: moving from dev server to production server | 1.2 | 0 | 0 | 307 |
10,953,060 | 2012-06-08T17:01:00.000 | 2 | 0 | 0 | 0 | python,sockets | 37,355,354 | 2 | false | 0 | 0 | Python supports os.writev() as well as sendmsg(). These functions are atomic, so are equivalent of calling write() and send() respectively with concatenated buffer.
There is TCP_CORK. You may say kernel not to send partial frames until un-corked.
Using either technique, you may have control over partial TCP frames. | 1 | 4 | 0 | In POSIX C we can use writev to write multiple arrays at once to a file descriptor. This is useful when you have to concatenate multiple buffers in order to form a single message to send through a socket (think of a HTTP header and body, for instance). This way I don't need to call send twice, once for the header and o... | Scatter/gather socket write in Python | 0.197375 | 0 | 1 | 708 |
10,954,677 | 2012-06-08T19:05:00.000 | 2 | 0 | 0 | 1 | python,google-app-engine,pipeline | 10,957,940 | 1 | true | 0 | 0 | There's no official way at the moment. You could probably prepend a task to the MapReduce pipeline to compute and cache the list (in the datastore or blobstore, whichever is most appropriate, plus a copy in memcache). Then have your mapper and/or reducer function do a lazy initialization of a global variable that holds... | 1 | 3 | 0 | I've begun creating a MapReduce job with the new Google App Engine Pipeline API, and I've run into a situation where I'd like every worker to have a copy of the same list during runtime.
One option would be to use memcache, but I'm worried that the size of this list might eventually be greater than what I can set with ... | Can I keep state across GAE Pipeline API workers? | 1.2 | 0 | 0 | 123 |
10,954,687 | 2012-06-08T19:06:00.000 | 3 | 0 | 1 | 0 | python,string | 10,954,728 | 2 | false | 0 | 0 | It depends on the representation of the object being printed; if the string to print contains the \" character, then a single quote will be used; if the string contains the \' character, then a double quote will be used. | 1 | 3 | 0 | I have a list I want to pretty print that contains empty lists as well as lists with string members. the problem is that lists that contains strings are printed with double quotes:
>>>str(['a'])
"['a']"
But an empty list is printed with single quotes:
>>> str([])
'[]'
Is there a way to always force printing str... | Print empty string with double quotes instead of single quotes in Python | 0.291313 | 0 | 0 | 4,892 |
10,955,150 | 2012-06-08T19:45:00.000 | 0 | 0 | 1 | 0 | python,multithreading,multiprocessing,gil | 10,956,679 | 2 | false | 0 | 0 | How is the GIL even relevant here? What are you expecting to get out of it?
You can spawn n threads and have them all perform blocking I/O, without a GIL.
And if you want to "manage" the threads—e.g., join the all so you know when you're done—you still need to do that explicitly; the GIL doesn't help. | 1 | 0 | 0 | Note: My education on this topic is lacking, so I may be making some naive assumptions.
Assume you have a function performing blocking I/O. You need to run this function n times.
If you were to simply spawn n threads (using the threading module) and start them at the same time, would it work to simply use the GIL to ma... | Using the GIL as a thread pool | 0 | 0 | 0 | 226 |
10,956,175 | 2012-06-08T21:20:00.000 | 2 | 0 | 1 | 0 | python,ubuntu,file-io | 10,956,213 | 3 | false | 0 | 0 | When files get too large, addressing becomes an issue. Typically you get 32 bits which translates to a maximum size of about 4 gb. | 2 | 5 | 0 | I am writing to a file using python. The script suddenly stops running and throws an 'IOError: [Errno 27] File too large'
Is there a limit on the size of the file that you are allowed to create using a program?
Has anyone else faced this issue?
The file size was close to 4.3Gb(it is a bit big) when it stopped. | File too Large python | 0.132549 | 0 | 0 | 10,844 |
10,956,175 | 2012-06-08T21:20:00.000 | 4 | 0 | 1 | 0 | python,ubuntu,file-io | 45,533,860 | 3 | false | 0 | 0 | I also got this error when I had too many files in one directory. I had 64435 files in a directory, each with 10 digits + '.json' in their names, and any subsequent attempts to write new files to the directory threw errors (e.g.) OSError: [Errno 27] File too large: 'ngrams/0/0/0/0000029503.json' | 2 | 5 | 0 | I am writing to a file using python. The script suddenly stops running and throws an 'IOError: [Errno 27] File too large'
Is there a limit on the size of the file that you are allowed to create using a program?
Has anyone else faced this issue?
The file size was close to 4.3Gb(it is a bit big) when it stopped. | File too Large python | 0.26052 | 0 | 0 | 10,844 |
10,956,683 | 2012-06-08T22:21:00.000 | 0 | 0 | 0 | 0 | python,ruby-on-rails,server-side | 33,303,096 | 2 | false | 1 | 0 | Are you sure your database is well maintained and efficient (good indexes, normalised, clean etc)
Or can you not make use of messaging queues, so you keep your rails crud app, then the jobs are just added to a queue. Python scripts on the backend (or different machine) read from the queue, process then insert back into... | 1 | 0 | 0 | I am a data scientist and database veteran but a total rookie in web development and have just finished developing my first Ruby On Rails app. This app accepts data from users submitting data to my frontend webpage and returns stats on the data submitted. Some users have been submitting way too much data - its getting ... | Ruby on Rails frontend and server side processing in Python or Java.. HOW, What, Huh? | 0 | 0 | 0 | 694 |
10,957,467 | 2012-06-09T00:34:00.000 | 1 | 0 | 1 | 0 | python,list,comparison | 10,957,519 | 2 | false | 0 | 0 | The most straightforward way: Create an object of each one, with your comparison function as __cmp__ (python 2.x) or define __lt__ and __eq__ (python 3.x). Stash each one in a list named list_. Find the least valued one using min(list_).
An optimization that might help, if practical: If you can come up with a way of ... | 1 | 1 | 0 | I have a function that takes as parameters 2 objects: a and b
The function checks (with a very long algorithm) which one of these objects is better.
If a is better it returns -1, if b is better it returns 1, if they tied it returns 0
My problem is:
I have 21 of these objects in a list.
I need to find out, using the fun... | Python, using a comparison function for finding the best object | 0.099668 | 0 | 0 | 103 |
10,957,877 | 2012-06-09T02:16:00.000 | 7 | 0 | 0 | 0 | python,database,flat-file | 10,957,953 | 2 | false | 0 | 0 | Assuming by 'database' you mean 'relational database' - even the embedded databases like SQLite come with some overhead compared to a plain text file. But, sometimes that overhead is worth it compared to rolling your own.
The biggest question you need to ask is whether you are storing relational data - whether things ... | 1 | 14 | 0 | I am making a little add-on for a game, and it needs to store information on a player:
username
ip-address
location in game
a list of alternate user names that have came from that ip or alternate ip addresses that come from that user name
I read an article a while ago that said that unless I am storing a large amount... | When is it appropriate to use a database , in Python | 1 | 1 | 0 | 5,782 |
10,959,051 | 2012-06-09T06:54:00.000 | 0 | 0 | 0 | 0 | python,django,performance,jquery,dajaxice | 10,959,121 | 1 | false | 1 | 0 | In my experience the main load in the web application laying on databases. Not on frameworks or templates engines. | 1 | 0 | 0 | If this question has already been answered by someone on this site, please point me there.
Is it a good option to use Dajaxice for a high-traffic website, assuming millions of hits per day? Has anybody faced performance issues in terms of load-times for web pages with multiple AJAX calls to server?
What are the alterna... | Dajaxice performance measures for high-traffic site | 0 | 0 | 0 | 218 |
10,959,227 | 2012-06-09T07:27:00.000 | 0 | 0 | 1 | 0 | python | 10,959,279 | 3 | false | 0 | 0 | A word is full-width if its characters are full-width. You need to look up the unicode specification and see which character ranges are full-width, then check each character against that. | 1 | 0 | 0 | Recently I've been dealing with texts with mixed languages, including Chinese, English, and even some emoticons.
I've been searching for this issue quite a lot, but the only thing I can find is "to replace full-width characters with half-width characters" rather than telling you how to determine whether the character i... | How to distinguish whether a word is half-width or full-width? | 0 | 0 | 0 | 1,957 |
10,960,085 | 2012-06-09T10:05:00.000 | 1 | 0 | 1 | 0 | python,functional-programming,list-comprehension | 10,960,143 | 5 | false | 0 | 0 | I'm sure that others will be able to explain it better than I will but functional programming just has mostly to do with how you think of the flow of the program and whether or not you can pass around functions as objects to compute on. For example in javascript when you provide a function to be executed when an even ... | 1 | 7 | 0 | In my Python learning book, when I read about List Comprehension, the author has a small note explaining:
Python’s list comprehension is an example of the language’s support for
functional programming concepts.
I have go on wikipedia to read about functional programming. But I hard to imagine because I don't see an... | Python: List Comprehension and Functional Programming | 0.039979 | 0 | 0 | 3,589 |
10,960,672 | 2012-06-09T11:39:00.000 | 4 | 0 | 0 | 0 | python | 10,960,826 | 1 | true | 0 | 0 | Unless you entirely control the system, I think you'd be better off abandoning this particular pursuit. Modern filesystems or mediums (e.g. SSD wear-leveling) can result in data being retained physically on-disk even if you overwrite them in-place.
Best practice in my book is to fill the disk with random data, then ex... | 1 | 0 | 0 | I'm going to make a kind of remover that erase files never recoverable.
I don't know the algorithm but I think it is possible to get exact file memory address and
write something like 'null' at there. So I'm searching at os module and others,
but don't know how to do that...Is there a function or the otherway?
Or what ... | How can I get the exact memory address on HDD of an file? | 1.2 | 0 | 0 | 130 |
10,962,076 | 2012-06-09T15:08:00.000 | 10 | 0 | 1 | 1 | python,concurrency,wsgi,tornado | 10,962,103 | 2 | false | 0 | 0 | If you are truly going to be dealing with multiple simultaneous requests that are compute-bound, and you want to do it in Python, then you need a multi-process server, not multi-threaded. CPython has Global Interpreter Lock (GIL) that prevents more than one thread from executing python bytecode at the same time.
Most... | 1 | 11 | 0 | I understand tornado is a single threaded and non-Blocking server, hence requests are handled sequentially (except when using event driven approach for IO operation).
Is there a way to process multiple requests parallel in tornado for normal(non-IO) execution. I can't fork multiple process since I need a common memory ... | Is concurrency possible in tornado? | 1 | 0 | 0 | 5,472 |
10,962,393 | 2012-06-09T15:52:00.000 | 7 | 0 | 1 | 0 | python,garbage-collection,cpython | 10,962,487 | 3 | false | 0 | 0 | How does Python detect & free circular memory references before making use of the gc module?
Python's garbage collector (not actually the gc module, which is just the Python interface to the garbage collector) does this. So, Python doesn't detect and free circular memory references before making use of the garbage col... | 1 | 43 | 0 | I'm trying to understand how Python's garbage collector detects circular references. When I look at the documentation, all I see is a statement that circular references are detected, except when the objects involved have a __del__ method.
If this happens, my understanding (possibly faulty) is that the gc module acts a... | How does Python's Garbage Collector Detect Circular References? | 1 | 0 | 0 | 14,083 |
10,967,849 | 2012-06-10T10:08:00.000 | 17 | 0 | 1 | 0 | python | 10,967,855 | 4 | true | 0 | 0 | Properties are more flexible than attributes, since you can define functions that describe what is supposed to happen when setting, getting or deleting them. If you don't need this additional flexibility, use attributes – they are easier to declare and faster.
In languages like Java, it is usually recommended to alway... | 3 | 8 | 0 | Just a quick question, I'm having a little difficulty understanding where to use properties vs. where use to plain old attributes. The distinction to me is a bit blurry. Any resources on the subject would be superb, thank you! | When to use attributes vs. when to use properties in python? | 1.2 | 0 | 0 | 1,363 |
10,967,849 | 2012-06-10T10:08:00.000 | 0 | 0 | 1 | 0 | python | 10,968,354 | 4 | false | 0 | 0 | In addition to what Daniel Roseman said, I often use properties when I'm wrapping something i.e. when I don't store the information myself but wrapped object does. Then properties make excellent accessors. | 3 | 8 | 0 | Just a quick question, I'm having a little difficulty understanding where to use properties vs. where use to plain old attributes. The distinction to me is a bit blurry. Any resources on the subject would be superb, thank you! | When to use attributes vs. when to use properties in python? | 0 | 0 | 0 | 1,363 |
10,967,849 | 2012-06-10T10:08:00.000 | 14 | 0 | 1 | 0 | python | 10,967,861 | 4 | false | 0 | 0 | The point is that the syntax is interchangeable. Always start with attributes. If you find you need additional calculations when accessing an attribute, replace it with a property. | 3 | 8 | 0 | Just a quick question, I'm having a little difficulty understanding where to use properties vs. where use to plain old attributes. The distinction to me is a bit blurry. Any resources on the subject would be superb, thank you! | When to use attributes vs. when to use properties in python? | 1 | 0 | 0 | 1,363 |
10,968,439 | 2012-06-10T11:51:00.000 | 9 | 0 | 0 | 1 | python,google-app-engine,gql,app-engine-ndb | 10,974,037 | 2 | false | 1 | 0 | This depends on lots of things like the size of the entities and the number of values that need to look up in the index, so it's best to benchmark it for your specific application. Also beware that if you find that on a sunny day it takes e.g. 10 seconds to load all your items, that probably means that some small frac... | 2 | 5 | 0 | I am looking around in order to get an answer what is the max limit of results I can have from a GQL query on Ndb on Google AppEngine. I am using an implementation with cursors but it will be much faster if I retrieve them all at once. | What is the Google Appengine Ndb GQL query max limit? | 1 | 1 | 0 | 1,106 |
10,968,439 | 2012-06-10T11:51:00.000 | 7 | 0 | 0 | 1 | python,google-app-engine,gql,app-engine-ndb | 10,969,575 | 2 | true | 1 | 0 | Basically you don't have the old limit of 1000 entities per query anymore, but consider using a reasonable limit, because you can hit the time out error and it's better to get them in batches so users won't wait during load time. | 2 | 5 | 0 | I am looking around in order to get an answer what is the max limit of results I can have from a GQL query on Ndb on Google AppEngine. I am using an implementation with cursors but it will be much faster if I retrieve them all at once. | What is the Google Appengine Ndb GQL query max limit? | 1.2 | 1 | 0 | 1,106 |
10,968,541 | 2012-06-10T12:07:00.000 | 0 | 1 | 1 | 0 | python,imap | 12,879,530 | 5 | true | 0 | 0 | To answer your question: What you're looking for doesn't exist in the wild AFAIK.
Short of that, have you considered calling context.io from Python? | 1 | 4 | 0 | Is there a high-level IMAP library for Python?
With high-level I mean, that I do not want a library where I can issue basic IMAP commands (like Python's own imaplib). What I want, is library that cares about most of the IMAP details and gives me a more generic interface with objects for folders/mailboxes and messages. ... | High-Level IMAP library for Python | 1.2 | 0 | 0 | 3,078 |
10,970,042 | 2012-06-10T15:43:00.000 | -1 | 1 | 1 | 0 | python | 23,380,402 | 5 | false | 0 | 0 | It's simpler than one may think. The following is for pc2 9.2.3-2565
Add language as follows (python here as an example):
Display Name: Python
Compile Cmd Line: touch OK
Executable Filename: OK
Program Execution Command Line: python {:mainfile}
python3.3 or python3.4 will work too.
pc2 could be easier, of course, but ... | 1 | 0 | 0 | I will be running a programming competition for high school students in the near future, and was originally going to use PC^2 (Programming Contest Control System) for the automated judging of the solutions. This software is commonly used in the ACM's International Collegiate Programming Contest regionals as well as the... | PC^2 equivalent compatible with Python | -0.039979 | 0 | 0 | 1,041 |
10,970,310 | 2012-06-10T16:28:00.000 | 4 | 0 | 0 | 1 | python,hadoop,amazon-web-services,amazon-emr | 10,970,649 | 1 | true | 0 | 0 | If you want to signal error, return a non-zero code from your python script. You can write any logging to stderr and hadoop will capture that in the task logs. You can also send status to the reporter and counters by prefixing the stderr lines with reporter:status:<msg> or reporter:counter:<group>,<name>,<increment> | 1 | 3 | 0 | What is the best practice for reporting exceptions in Hadoop streaming with Python scripts?
I mean: let's say I have a mapper script that can't understand its input, how do I signal Hadoop to terminate the job & report an error message?
Do I use logging and finish off with sys.exit? | Hadoop streaming: reporting error | 1.2 | 0 | 0 | 1,374 |
10,972,821 | 2012-06-10T22:25:00.000 | 0 | 0 | 0 | 0 | python,pygtk | 10,973,513 | 1 | true | 0 | 1 | So, I understand now: it turns out that when items are reordered in IconView, gtk.ListStore.reorder or something similar is called. What that means is that all I needed to do was to use gtk.ListStore.get_iter() or gtk.ListStore.get_iter_first() and all the problems are solved.
How trivial! All I needed to do was eat ... | 1 | 0 | 0 | Using PyGtk's IconView, I can set the icons to be reorderable by calling gtk.IconView.set_reorderable(True). My question is what is the best way to retrieve the new order? That is, how should I access a property of each of the elements in the new order? An iterator of sorts?
I am using gtk.ListStore to store the dat... | Reordering in IconView (PyGtk) | 1.2 | 0 | 0 | 135 |
10,973,432 | 2012-06-11T00:21:00.000 | 1 | 0 | 0 | 1 | python,google-app-engine,web-applications | 10,973,713 | 1 | false | 1 | 0 | You'd use the datastore to create a union as an entity class, with a description and a name. If your image is small you can store it in your entity, if it's large, you may store it in the blobstore and store a link to it inside your entity.
You can use the python User API for authentication. You don't really need any... | 1 | 0 | 0 | First than all, I don't even know if this is a session related question. But I could not think a better way to describe it in the title.
I'm developing a web application for registered users so they can create and manage trade unions.
A user can create several unions. Each union can store an image, a description and a ... | How to do this kind of session related task in App Engine Python? | 0.197375 | 0 | 0 | 42 |
10,978,425 | 2012-06-11T10:29:00.000 | 4 | 0 | 1 | 0 | python,regex,twitter | 10,978,445 | 2 | false | 0 | 0 | Just remove the anchor ^ and $ and you will be good to go.
In case you don't want to match empty string from "Example @ nothing", you may want to specify "1 or more qualifier" + instead of *. i.e. @([a-zA-Z0-9_]+)[:;, ]
Restricting to 1-15 character username can be done by replacing * with {1,15}, i.e. @([a-zA-Z0-9_]{1... | 1 | 1 | 0 | How do I match words that begin with @ and ends with ;, ., :, or ?
The words can have any alphanumeric characters and may consist of underscores.
I have come up with ^@([a-zA-Z0-9_])*[:;, ]$ which seems to work for single word sentences alone. | Matching @user with regex | 0.379949 | 0 | 0 | 213 |
10,979,667 | 2012-06-11T11:59:00.000 | 202 | 0 | 1 | 0 | python,ipython,jupyter | 10,986,483 | 12 | true | 0 | 0 | CTRL - ML toggles line numbers in the CodeMirror area. See the QuickHelp for other keyboard shortcuts.
In more details CTRL - M (or ESC) bring you to command mode, then pressing the L keys should toggle the visibility of current cell line numbers. In more recent notebook versions Shift-L should toggle for all cells.
I... | 6 | 176 | 0 | Error reports from most language kernels running in IPython/Jupyter Notebooks indicate the line on which the error occurred; but (at least by default) no line numbers are indicated in Notebooks.
Is it possibile to add the line numbers to IPython/Jupyter Notebooks? | Showing line numbers in IPython/Jupyter Notebooks | 1.2 | 0 | 0 | 185,903 |
10,979,667 | 2012-06-11T11:59:00.000 | 7 | 0 | 1 | 0 | python,ipython,jupyter | 36,500,917 | 12 | false | 0 | 0 | For me, ctrl + m is used to save the webpage as png, so it does not work properly. But I find another way.
On the toolbar, there is a bottom named open the command paletee, you can click it and type in the line, and you can see the toggle cell line number here. | 6 | 176 | 0 | Error reports from most language kernels running in IPython/Jupyter Notebooks indicate the line on which the error occurred; but (at least by default) no line numbers are indicated in Notebooks.
Is it possibile to add the line numbers to IPython/Jupyter Notebooks? | Showing line numbers in IPython/Jupyter Notebooks | 1 | 0 | 0 | 185,903 |
10,979,667 | 2012-06-11T11:59:00.000 | 9 | 0 | 1 | 0 | python,ipython,jupyter | 42,519,445 | 12 | false | 0 | 0 | Here is how to know active shortcut (depending on your OS and notebook version, it might change)
Help > Keyboard Shortcuts > toggle line numbers
On OSX running ipython3 it was ESC L | 6 | 176 | 0 | Error reports from most language kernels running in IPython/Jupyter Notebooks indicate the line on which the error occurred; but (at least by default) no line numbers are indicated in Notebooks.
Is it possibile to add the line numbers to IPython/Jupyter Notebooks? | Showing line numbers in IPython/Jupyter Notebooks | 1 | 0 | 0 | 185,903 |
10,979,667 | 2012-06-11T11:59:00.000 | 6 | 0 | 1 | 0 | python,ipython,jupyter | 59,373,156 | 12 | false | 0 | 0 | Adding to ronnefeldt's accepted answer: Shift L toggles line numbers in all cells. This works in JupyterLab 1.0.0 and in Jupyter Notebooks. | 6 | 176 | 0 | Error reports from most language kernels running in IPython/Jupyter Notebooks indicate the line on which the error occurred; but (at least by default) no line numbers are indicated in Notebooks.
Is it possibile to add the line numbers to IPython/Jupyter Notebooks? | Showing line numbers in IPython/Jupyter Notebooks | 1 | 0 | 0 | 185,903 |
10,979,667 | 2012-06-11T11:59:00.000 | 1 | 0 | 1 | 0 | python,ipython,jupyter | 45,615,365 | 12 | false | 0 | 0 | You can also find Toggle Line Numbers under View on the top toolbar of the Jupyter notebook in your browser.
This adds/removes the lines numbers in all notebook cells.
For me, Esc+l only added/removed the line numbers of the active cell. | 6 | 176 | 0 | Error reports from most language kernels running in IPython/Jupyter Notebooks indicate the line on which the error occurred; but (at least by default) no line numbers are indicated in Notebooks.
Is it possibile to add the line numbers to IPython/Jupyter Notebooks? | Showing line numbers in IPython/Jupyter Notebooks | 0.016665 | 0 | 0 | 185,903 |
10,979,667 | 2012-06-11T11:59:00.000 | -3 | 0 | 1 | 0 | python,ipython,jupyter | 41,928,934 | 12 | false | 0 | 0 | 1.press esc to enter the command mode
2.perss l(it L in lowcase) to show the line number | 6 | 176 | 0 | Error reports from most language kernels running in IPython/Jupyter Notebooks indicate the line on which the error occurred; but (at least by default) no line numbers are indicated in Notebooks.
Is it possibile to add the line numbers to IPython/Jupyter Notebooks? | Showing line numbers in IPython/Jupyter Notebooks | -0.049958 | 0 | 0 | 185,903 |
10,979,918 | 2012-06-11T12:15:00.000 | 1 | 0 | 1 | 1 | python,upgrade,pythonpath,system-variable | 10,979,970 | 2 | false | 0 | 0 | I know you say you've updated %PATH%. However, from the description of the symptoms it is almost certain that c:\Python27 still appears on the %PATH% instead of (or before) c:\Python32.
To diagnose, start cmd.exe and type set. Then locate PATH and see what Python directories it contains and in what order. | 2 | 1 | 0 | I have installed a new version of Python, so I want to make sure when Python is invoked that version is first in my path. So, now on my 'C' drive I have "Python27" and "Python32" (old and new version, respectively).
When I type "python" in the command line I get "Python 2.7". Using control panel I have changed the "pa... | How to make newest version of Python the default or first in path | 0.099668 | 0 | 0 | 109 |
10,979,918 | 2012-06-11T12:15:00.000 | 1 | 0 | 1 | 1 | python,upgrade,pythonpath,system-variable | 10,980,880 | 2 | false | 0 | 0 | Personally, I put the dirs to all installed Python versions in %PATH%, but changed the executable names for all but the 'default' version. E.g., I have a C:\Python26\Python.exe, C:\Python27\Python27.exe and a C:\Python32\Python32.exe. This way I can easily start any version from the command line. | 2 | 1 | 0 | I have installed a new version of Python, so I want to make sure when Python is invoked that version is first in my path. So, now on my 'C' drive I have "Python27" and "Python32" (old and new version, respectively).
When I type "python" in the command line I get "Python 2.7". Using control panel I have changed the "pa... | How to make newest version of Python the default or first in path | 0.099668 | 0 | 0 | 109 |
10,983,139 | 2012-06-11T15:28:00.000 | 2 | 0 | 1 | 0 | python,multithreading | 10,991,579 | 3 | false | 0 | 0 | A fairly simple answer that occurred to me after posting this is to simply break up the timer into multiple sub-timers, e.g. having 10 6-second timers instead where each one starts the next one in a chain. That way, if I get suspended, I only lose one of the timers and still get most of the wait before timing out.
This... | 1 | 3 | 0 | I have some Python code which uses threading.Timer to implement a 60-second timeout for an operation.
The problem is that this code runs in a job-control environment where it may get pre-empted by a higher priority job. In this case it will be sent SIGSTOP, and then some time later, SIGCONT. I need a way to somehow not... | How to handle timeouts when a process receives SIGSTOP and SIGCONT? | 0.132549 | 0 | 0 | 428 |
10,984,263 | 2012-06-11T16:46:00.000 | 5 | 0 | 0 | 0 | python,wxpython | 10,984,306 | 2 | true | 0 | 1 | The & character is a special symbol for those kinds of buttons. It defines what key you press to use a keyboard shortcut.
&x - [Alt]+[x] hotkey shortcut. You can escape it by using a second: && -> '&' char | 1 | 3 | 0 | When I use wx python to create a button with a file name as the button label, I lose the & character that is inside of the file names.
If a file were named: hello&goodbye.txt, the button would read: hellogoodbye.txt
I have no idea where the & character goes and would love a little help here. | Python '&' Character is missing | 1.2 | 0 | 0 | 203 |
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