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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1,559,372 | 2009-10-13T10:25:00.000 | 17 | 1 | 1 | 0 | python,setuptools,distutils,pip | 1,559,521 | 2 | false | 0 | 0 | There are two completely opposing camps: one in favor of system-provided packages, and one in favor of separate installation. I'm personally in the "system packages" camp. I'll provide arguments from each side below.
Pro system packages: system packager already cares about dependency, and compliance with overall system... | 1 | 11 | 0 | Usually I tend to install things via the package manager, for unixy stuff. However, when I programmed a lot of perl, I would use CPAN, newer versions and all that.
In general, I used to install system stuff via package manager, and language stuff via it's own package manager ( gem/easy_install|pip/cpan)
Now using pyth... | Which is the most pythonic: installing python modules via a package manager ( macports, apt) or via pip/easy_install/setuptools | 1 | 0 | 0 | 1,252 |
1,560,245 | 2009-10-13T13:26:00.000 | 1 | 0 | 1 | 0 | python,api,collections,equality | 1,569,134 | 2 | true | 0 | 0 | Take a look at "collections.py". The latest version (from version control) implements an OrderedDict with an __eq__. There's also an __eq__ in sets.py | 1 | 6 | 0 | I'm working on a collection class that I want to create an __eq__ method for. It's turning out to be more nuanced than I thought it would be and I've noticed several intricacies as far as how the built-in collection classes work.
What would really help me the most is a good example. Are there any pure Python implemen... | What is a good example of an __eq__ method for a collection class? | 1.2 | 0 | 0 | 8,480 |
1,561,104 | 2009-10-13T15:44:00.000 | 1 | 0 | 0 | 0 | python,pygame,pitch | 1,561,314 | 1 | true | 0 | 1 | Well, it depends on how you're doing your sounds: I'm not sure if this is possible with pygame, but SDL (which pygame is based off of) lets you have a callback to retrieve data for the sound buffer, and it's possible to change the frequency of the sine wave (or whatever) to get different tones in the callback, given th... | 1 | 1 | 0 | Is there a way to do this? Also, I need this to work with pygame, since I want audio in my game. I'm asking this because I didn't see any tone change function in pygame.. Anyone knows?
Update:
I need to do something like the noise of a car accelerating. I don't really know if it is timbre or tone. | Playing sounds with python and changing their tone during playback? | 1.2 | 0 | 0 | 1,240 |
1,562,483 | 2009-10-13T19:39:00.000 | 7 | 0 | 0 | 0 | macos,wxpython,osx-snow-leopard,py2app | 1,583,793 | 1 | false | 0 | 1 | I solved this by doing a clean Snow Leopard install, and installing python from Python.org, then the corresponding wxPython. py2app I built from source. | 1 | 4 | 0 | After upgrading to Snow Leopard, I'm having trouble building my application. It looks like py2app is building and copying over wxPython, but when I run from the buld app, it can't find wx. | py2app dropping wxpython (Snow Leopard) | 1 | 0 | 0 | 997 |
1,563,088 | 2009-10-13T21:43:00.000 | 1 | 0 | 0 | 0 | python,database,django,url,content-management-system | 1,563,359 | 2 | false | 1 | 0 | Your question is a little bit twisted, but I think what you're asking for is something similar to how django.contrib.flatpages handles this. Basically it uses middleware to catch the 404 error and then looks to see if any of the flatpages have a URL field that matches.
We did this on one site where all of the URLs were... | 1 | 1 | 0 | I've produced a few Django sites but up until now I have been mapping individual views and URLs in urls.py.
Now I've tried to create a small custom CMS but I'm having trouble with the URLs. I have a database table (SQLite3) which contains code for the pages like a column for header, one for right menu, one for content.... | URLs stored in database for Django site | 0.099668 | 1 | 0 | 3,215 |
1,563,165 | 2009-10-13T21:58:00.000 | 11 | 0 | 0 | 0 | python,google-app-engine,xpath,beautifulsoup,mechanize | 1,563,177 | 5 | false | 1 | 0 | Beautiful Soup. | 2 | 2 | 0 | I currently have some Ruby code used to scrape some websites. I was using Ruby because at the time I was using Ruby on Rails for a site, and it just made sense.
Now I'm trying to port this over to Google App Engine, and keep getting stuck.
I've ported Python Mechanize to work with Google App Engine, but it doesn't sup... | What pure Python library should I use to scrape a website? | 1 | 0 | 1 | 1,959 |
1,563,165 | 2009-10-13T21:58:00.000 | 6 | 0 | 0 | 0 | python,google-app-engine,xpath,beautifulsoup,mechanize | 1,563,301 | 5 | false | 1 | 0 | lxml -- 100x better than elementtree | 2 | 2 | 0 | I currently have some Ruby code used to scrape some websites. I was using Ruby because at the time I was using Ruby on Rails for a site, and it just made sense.
Now I'm trying to port this over to Google App Engine, and keep getting stuck.
I've ported Python Mechanize to work with Google App Engine, but it doesn't sup... | What pure Python library should I use to scrape a website? | 1 | 0 | 1 | 1,959 |
1,563,967 | 2009-10-14T02:31:00.000 | 1 | 0 | 0 | 0 | python,sql,postgresql,psycopg2 | 1,564,226 | 5 | false | 0 | 0 | Quoting parameters manually in general is a bad idea. What if there is a mistake in escaping rules? What if escape doesn't match used version of DB? What if you just forget to escape some parameter or erroneously assumed it can't contain data requiring escaping? That all may cause SQL injection vulnerability. Also, DB ... | 3 | 17 | 0 | I need to generate a list of insert statements (for postgresql) from html files, is there a library available for python to help me properly escape and quote the names/values? in PHP i use PDO to do the escaping and quoting, is there any equivalent library for python?
Edit: I need to generate a file with sql statements... | Generate SQL statements with python | 0.039979 | 1 | 0 | 50,856 |
1,563,967 | 2009-10-14T02:31:00.000 | 2 | 0 | 0 | 0 | python,sql,postgresql,psycopg2 | 1,563,981 | 5 | false | 0 | 0 | For robustness, I recommend using prepared statements to send user-entered values, no matter what language you use. :-) | 3 | 17 | 0 | I need to generate a list of insert statements (for postgresql) from html files, is there a library available for python to help me properly escape and quote the names/values? in PHP i use PDO to do the escaping and quoting, is there any equivalent library for python?
Edit: I need to generate a file with sql statements... | Generate SQL statements with python | 0.07983 | 1 | 0 | 50,856 |
1,563,967 | 2009-10-14T02:31:00.000 | 13 | 0 | 0 | 0 | python,sql,postgresql,psycopg2 | 1,564,224 | 5 | false | 0 | 0 | SQLAlchemy provides a robust expression language for generating SQL from Python.
Like every other well-designed abstraction layer, however, the queries it generates insert data through bind variables rather than through attempting to mix the query language and the data being inserted into a single string. This approach... | 3 | 17 | 0 | I need to generate a list of insert statements (for postgresql) from html files, is there a library available for python to help me properly escape and quote the names/values? in PHP i use PDO to do the escaping and quoting, is there any equivalent library for python?
Edit: I need to generate a file with sql statements... | Generate SQL statements with python | 1 | 1 | 0 | 50,856 |
1,564,237 | 2009-10-14T04:27:00.000 | 1 | 1 | 0 | 0 | python,gmail,imap,pop3,imaplib | 1,564,294 | 6 | false | 0 | 0 | Nobody uses POP because typically they want the extra functionality of IMAP, such as tracking message state. When that functionality is only getting in your way and needs workarounds, I think using POP's your best bet!-) | 1 | 4 | 0 | Right now its a gmail box but sooner or later I want it to scale.
I want to sync a copy of a live personal mailbox (inbox and outbox) somewhere else, but I don't want to affect the unread state of any unread messages.
what type of access will make this easiest? I can't find any information if IMAP will affect the read... | get email unread content, without affecting unread state | 0.033321 | 0 | 0 | 5,515 |
1,564,414 | 2009-10-14T05:30:00.000 | 3 | 0 | 1 | 0 | python | 1,564,429 | 6 | false | 0 | 0 | Look into Python's concept called sequence slicing! | 1 | 0 | 0 | How to extract substrings from a string at specified positions
For e.g.: ‘ABCDEFGHIJKLM’. I have To extract the substring from 3 to 6 and 8 to 10.
Required output: DEFG, IJK
Thanks in advance. | Extracting substrings at specified positions | 0.099668 | 0 | 0 | 226 |
1,566,266 | 2009-10-14T13:34:00.000 | 3 | 0 | 1 | 0 | python | 1,566,316 | 12 | false | 0 | 0 | Ok, personal opinion here, but Append and Prepend imply precise positions in a set.
Push and Pop are really concepts that can be applied to either end of a set... Just as long as you're consistent... For some reason, to me, Push() seems like it should apply to the front of a set... | 5 | 295 | 0 | Does anyone know why Python's list.append function is not called list.push given that there's already a list.pop that removes and returns the last element (that indexed at -1) and list.append semantic is consistent with that use? | Why do python lists have pop() but not push() | 0.049958 | 0 | 0 | 259,387 |
1,566,266 | 2009-10-14T13:34:00.000 | 10 | 0 | 1 | 0 | python | 1,566,294 | 12 | false | 0 | 0 | Because "append" intuitively means "add at the end of the list". If it was called "push", then it would be unclear whether we're adding stuff at the tail or at head of the list. | 5 | 295 | 0 | Does anyone know why Python's list.append function is not called list.push given that there's already a list.pop that removes and returns the last element (that indexed at -1) and list.append semantic is consistent with that use? | Why do python lists have pop() but not push() | 1 | 0 | 0 | 259,387 |
1,566,266 | 2009-10-14T13:34:00.000 | 10 | 0 | 1 | 0 | python | 1,566,287 | 12 | false | 0 | 0 | Because it appends an element to a list? Push is usually used when referring to stacks. | 5 | 295 | 0 | Does anyone know why Python's list.append function is not called list.push given that there's already a list.pop that removes and returns the last element (that indexed at -1) and list.append semantic is consistent with that use? | Why do python lists have pop() but not push() | 1 | 0 | 0 | 259,387 |
1,566,266 | 2009-10-14T13:34:00.000 | 0 | 0 | 1 | 0 | python | 1,566,293 | 12 | false | 0 | 0 | Probably because the original version of Python (CPython) was written in C, not C++.
The idea that a list is formed by pushing things onto the back of something is probably not as well-known as the thought of appending them. | 5 | 295 | 0 | Does anyone know why Python's list.append function is not called list.push given that there's already a list.pop that removes and returns the last element (that indexed at -1) and list.append semantic is consistent with that use? | Why do python lists have pop() but not push() | 0 | 0 | 0 | 259,387 |
1,566,266 | 2009-10-14T13:34:00.000 | -2 | 0 | 1 | 0 | python | 4,752,493 | 12 | false | 0 | 0 | Push and Pop make sense in terms of the metaphor of a stack of plates or trays in a cafeteria or buffet, specifically the ones in type of holder that has a spring underneath so the top plate is (more or less... in theory) in the same place no matter how many plates are under it.
If you remove a tray, the weight on th... | 5 | 295 | 0 | Does anyone know why Python's list.append function is not called list.push given that there's already a list.pop that removes and returns the last element (that indexed at -1) and list.append semantic is consistent with that use? | Why do python lists have pop() but not push() | -0.033321 | 0 | 0 | 259,387 |
1,566,411 | 2009-10-14T14:00:00.000 | 0 | 0 | 1 | 0 | python,jython | 1,566,484 | 3 | false | 0 | 0 | I would expect that the developers will be working towards compatability with 3.0 at this point. Since they released 2.5 in june I'd hope for a 3.0 version no earlier than Jan.-Mar. 2010, but given their slow release cycle, it could be a while. | 3 | 4 | 0 | I have a large infrastructure that is written in Python 2.6, and I recently took a stab at porting to 3.1 (was much smoother than I expected) despite the lack of backwards compatibility.
I eventually want to integrate some of this Python code with a lot of Java based code that we have, and was thinking about giving Jyt... | Should I keep my Python code at 2.x or migrate to 3.x if I plan to eventually use Jython? | 0 | 0 | 0 | 237 |
1,566,411 | 2009-10-14T14:00:00.000 | 5 | 0 | 1 | 0 | python,jython | 1,566,453 | 3 | true | 0 | 0 | Jython will not support Python 3.x in the near future. For your code, I recommend to keep it in 2.x form, such that 3.x support becomes available by merely running 2to3 (i.e. with no further source changes). IOW, port to 3.x in a way so that the code remains compatible with 2.x. | 3 | 4 | 0 | I have a large infrastructure that is written in Python 2.6, and I recently took a stab at porting to 3.1 (was much smoother than I expected) despite the lack of backwards compatibility.
I eventually want to integrate some of this Python code with a lot of Java based code that we have, and was thinking about giving Jyt... | Should I keep my Python code at 2.x or migrate to 3.x if I plan to eventually use Jython? | 1.2 | 0 | 0 | 237 |
1,566,411 | 2009-10-14T14:00:00.000 | 0 | 0 | 1 | 0 | python,jython | 1,567,742 | 3 | false | 0 | 0 | With time 2.x will be surpassed by the new features of his 3.x. If you wish to programming in Python in the future then "the sooner = the better" | 3 | 4 | 0 | I have a large infrastructure that is written in Python 2.6, and I recently took a stab at porting to 3.1 (was much smoother than I expected) despite the lack of backwards compatibility.
I eventually want to integrate some of this Python code with a lot of Java based code that we have, and was thinking about giving Jyt... | Should I keep my Python code at 2.x or migrate to 3.x if I plan to eventually use Jython? | 0 | 0 | 0 | 237 |
1,569,049 | 2009-10-14T21:15:00.000 | 3 | 0 | 1 | 0 | python,exception,assert | 1,569,618 | 8 | false | 0 | 0 | To see if try has any overhead I tried this experiment
here is myassert.py
def myassert(e):
raise e
def f1(): #this is the control for the experiment
cond=True
def f2():
cond=True
try:
assert cond, "Message"
except AssertionError, e:
raise Exception(e.args)
def... | 2 | 51 | 0 | Can I make assert throw an exception that I choose instead of AssertionError?
UPDATE:
I'll explain my motivation: Up to now, I've had assertion-style tests that raised my own exceptions; For example, when you created a Node object with certain arguments, it would check if the arguments were good for creating a node, an... | Making Python's `assert` throw an exception that I choose | 0.07486 | 0 | 0 | 49,170 |
1,569,049 | 2009-10-14T21:15:00.000 | 12 | 0 | 1 | 0 | python,exception,assert | 1,569,579 | 8 | false | 0 | 0 | Never use an assertion for logic! Only for optional testing checks. Remember, if Python is running with optimizations turned on, asserts aren't even compiled into the bytecode. If you're doing this, you obviously care about the exception being raised and if you care, then you're using asserts wrong in the first place. | 2 | 51 | 0 | Can I make assert throw an exception that I choose instead of AssertionError?
UPDATE:
I'll explain my motivation: Up to now, I've had assertion-style tests that raised my own exceptions; For example, when you created a Node object with certain arguments, it would check if the arguments were good for creating a node, an... | Making Python's `assert` throw an exception that I choose | 1 | 0 | 0 | 49,170 |
1,570,401 | 2009-10-15T05:13:00.000 | 1 | 0 | 0 | 1 | python,linux,usergroups | 1,571,882 | 4 | false | 0 | 0 | There are no library calls for creating a group. This is because there's really no such thing as creating a group. A GID is simply a number assigned to a process or a file. All these numbers exist already - there is nothing you need to do to start using a GID. With the appropriate privileges, you can call chown(2) to s... | 3 | 6 | 0 | I want to create a user group using python on CentOS system. When I say 'using python' I mean I don't want to do something like os.system and give the unix command to create a new group. I would like to know if there is any python module that deals with this.
Searching on the net did not reveal much about what I want, ... | Create a user-group in linux using python | 0.049958 | 0 | 0 | 6,393 |
1,570,401 | 2009-10-15T05:13:00.000 | 5 | 0 | 0 | 1 | python,linux,usergroups | 1,570,429 | 4 | false | 0 | 0 | I think you should use the commandline programs from your program, a lot of care has gone into making sure that they don't break the groups file if something goes wrong.
However the file format is quite straight forward to write something yourself if you choose to go that way | 3 | 6 | 0 | I want to create a user group using python on CentOS system. When I say 'using python' I mean I don't want to do something like os.system and give the unix command to create a new group. I would like to know if there is any python module that deals with this.
Searching on the net did not reveal much about what I want, ... | Create a user-group in linux using python | 0.244919 | 0 | 0 | 6,393 |
1,570,401 | 2009-10-15T05:13:00.000 | 11 | 0 | 0 | 1 | python,linux,usergroups | 1,570,448 | 4 | true | 0 | 0 | I don't know of a python module to do it, but the /etc/group and /etc/gshadow format is pretty standard, so if you wanted you could just open the files, parse their current contents and then add the new group if necessary.
Before you go doing this, consider:
What happens if you try to add a group that already exists o... | 3 | 6 | 0 | I want to create a user group using python on CentOS system. When I say 'using python' I mean I don't want to do something like os.system and give the unix command to create a new group. I would like to know if there is any python module that deals with this.
Searching on the net did not reveal much about what I want, ... | Create a user-group in linux using python | 1.2 | 0 | 0 | 6,393 |
1,571,598 | 2009-10-15T10:50:00.000 | 1 | 1 | 0 | 0 | python,xml-rpc | 1,608,160 | 2 | false | 0 | 0 | I don't think you have a library specific problem. When using any library or framework you typically want to trap all errors, log them somewhere, and throw up "Oops, we're having problems. You may want to contact us at x@x.com with error number 100 and tell us what you did." So wrap your failable entry points in try... | 1 | 1 | 0 | Standard libraries (xmlrpclib+SimpleXMLRPCServer in Python 2 and xmlrpc.server in Python 3) report all errors (including usage errors) as python exceptions which is not suitable for public services: exception strings are often not easy understandable without python knowledge and might expose some sensitive information.... | XML-RPC server with better error reporting | 0.099668 | 0 | 1 | 1,435 |
1,572,661 | 2009-10-15T14:16:00.000 | 1 | 0 | 0 | 0 | python,zope,zenoss | 1,578,608 | 1 | true | 1 | 0 | The problem turned out to be that none of the template changes I made actually had any impact on the final page output. The changes were picked up, they just didn't matter. | 1 | 0 | 0 | I'm writing a ZenPack for Zenoss which includes a new DataSource. The DataSource has a ToOne relationship with another persistent object and I'm trying to construct the user interface to allow a user to specify the value of this relationship. I've given the DataSource a factory_type_information attribute with an "imm... | How can I make Zenoss recognize skin changes? | 1.2 | 0 | 0 | 433 |
1,572,691 | 2009-10-15T14:23:00.000 | 6 | 0 | 0 | 0 | python,python-imaging-library | 1,573,679 | 4 | false | 0 | 1 | You might consider a rather different approach to your image... build it out of tiles of a fixed size. That way, as you need to expand, you just add new image tiles. When you have completed all of your computation, you can determine the final size of the image, create a blank image of that size, and paste the tiles i... | 1 | 26 | 0 | I am probably looking for the wrong thing in the handbook, but I am looking to take an image object and expand it without resizing (stretching/squishing) the original image.
Toy example: imagine a blue rectangle, 200 x 100, then I perform some operation and I have a new image object, 400 x 300, consisting of a white ... | In Python, Python Image Library 1.1.6, how can I expand the canvas without resizing? | 1 | 0 | 0 | 13,934 |
1,573,166 | 2009-10-15T15:35:00.000 | 2 | 0 | 0 | 0 | python,database,zenoss | 7,033,005 | 2 | false | 1 | 0 | I am working on this very problem this week with Zenoss 3.1.
Caveat-
If you make a bad zenpack - no wait - when you make a bad one, it can get stuck in Zope's db, and there is no way to get it out AFAIK. So-
First use the GUI to make a complete backup of a clean Zenoss site.
Later you will need to restore using zenrest... | 1 | 2 | 0 | ZenPack development seems to involve the creation of a variety of persistent state. There are model classes which represent explicitly persistent state. There are skins which are associated with model objects. There are organizers and instances of persistent classes (data sources, graphs, etc).
Considering that duri... | What is the typical workflow for development of a Zenoss ZenPack? | 0.197375 | 0 | 0 | 1,306 |
1,575,966 | 2009-10-16T01:03:00.000 | 4 | 1 | 0 | 1 | python,unit-testing,twisted | 1,580,776 | 4 | false | 0 | 0 | As others mentioned, you should be using Trial for unit tests in Twisted.
You also should be unit testing from the bottom up - that's what the "unit" in unit testing implies. Test your data and logic before you test your interface. For a HTTP interface, you should be calling processGET, processPOST, etc with a mock r... | 1 | 19 | 0 | I'm writing unit tests for a portion of an application that runs as an HTTP server. The approach I have been trying to take is to import the module that contains the HTTP server, start it. Then, the unit tests will use urllib2 to connect, send data, and check the response.
Our HTTP server is using Twisted. One probl... | Python - Twisted and Unit Tests | 0.197375 | 0 | 0 | 5,134 |
1,575,985 | 2009-10-16T01:10:00.000 | 3 | 0 | 1 | 0 | python,multiprocessing | 1,576,115 | 2 | true | 0 | 0 | I don't really see a "style" argument to be made here, either way -- both multiprocessing in CPython 2.6, and threading in (e.g.) the current versions of Jython and IronPython, let you code in extremely similar ways (and styles;-). So, I'd choose on the basis of very "hard-nosed" considerations -- what is performance ... | 1 | 1 | 0 | This is more a style question. For CPU bound processes that really benefit for having multiple cores, do you typically use the multiprocessing module or use threads with an interpreter that doesn't have the GIL? I've used the multiprocessing library only lightly, but also have no experience with anything besides CPyt... | Python on multiprocessor machines: multiprocessing or a non-GIL interpreter | 1.2 | 0 | 0 | 792 |
1,576,459 | 2009-10-16T06:39:00.000 | 0 | 0 | 1 | 0 | python,html,diff,prettify | 1,576,663 | 7 | false | 0 | 0 | try first of all clean up both of HTML by lxml.html, and the check the difference by difflib | 1 | 33 | 0 | I have two chunks of text that I would like to compare and see which words/lines have been added/removed/modified in Python (similar to a Wiki's Diff Output).
I have tried difflib.HtmlDiff but it's output is less than pretty.
Is there a way in Python (or external library) that would generate clean looking HTML of the... | Generate pretty diff html in Python | 0 | 0 | 0 | 36,654 |
1,576,737 | 2009-10-16T08:07:00.000 | 0 | 1 | 1 | 0 | c++,python,swig,gil | 1,576,959 | 3 | false | 0 | 1 | You can use the same API call as for C. No difference. Include "python.h" and call the appoproate function.
Also, see if SWIG doesn't have a typemap or something to indicate that the GIL shuold not be held for a specific function. | 1 | 7 | 0 | I've got a library written in C++ which I wrap using SWIG and use in python. Generally there is one class with few methods. The problem is that calling these methods may be time consuming - they may hang my application (GIL is not released when calling these methods). So my question is:
What is the simplest way to rel... | Releasing Python GIL while in C++ code | 0 | 0 | 0 | 3,393 |
1,576,784 | 2009-10-16T08:21:00.000 | 1 | 1 | 0 | 0 | python,svn | 1,593,977 | 2 | true | 0 | 0 | Got it! I missed the export in my post-commit hook script!
It should have been:
export PYTHONPATH=/usr/local/lib/svn-python
Problem solved :) | 1 | 1 | 0 | I am experiencing issues with my SVN post-commit hook and the fact that it is executed with an empty environment. Everything was working fine till about two weeks ago when my systems administrator upgraded a few things on the server.
My post-commit hook executes a Python script that uses a SVN module to email informat... | SVN hook environment issues with Python script | 1.2 | 0 | 0 | 419 |
1,577,175 | 2009-10-16T09:53:00.000 | 4 | 0 | 0 | 0 | python,user-interface,cross-platform | 1,577,197 | 4 | false | 0 | 1 | You might want to check out wxPython. It's a mature project and should work on Windows
and Linux (Gnome). | 1 | 4 | 0 | I need to create a desktop app that will work with Windows and Gnome(Ubuntu). I would like to use Python to do this. The GUI part of the app will be a single form with a message area and a couple of buttons.
The list of GUI's for Python seems overwhelming. I am looking for something simple if possible, the main requ... | Python GUI Library for Windows/Gnome | 0.197375 | 0 | 0 | 895 |
1,578,010 | 2009-10-16T13:21:00.000 | 1 | 0 | 1 | 0 | compilation,ironpython | 4,176,979 | 5 | false | 0 | 0 | Yes I have found it too difficult to compile an exe so I have switched back to using standard Python. They should give a good tutorial on it on the IronPython site | 1 | 18 | 0 | I already attempted using py2exe (not compatible with ipy) and PYC (out of date). Can anyone point me in the direction of a good compiler? | Ironpython 2.6 .py -> .exe | 0.039979 | 0 | 0 | 22,377 |
1,579,744 | 2009-10-16T18:48:00.000 | 6 | 0 | 1 | 0 | python,arrays,types,tuples | 1,579,821 | 5 | false | 0 | 0 | How do you decide which data type to use? Easy:
You look at which are available and choose the one that does what you want. And if there isn't one, you make one.
In this case a dict is a pretty obvious solution. | 3 | 3 | 0 | I'm working through some tutorials on Python and am at a position where I am trying to decide what data type/structure to use in a certain situation.
I'm not clear on the differences between arrays, lists, dictionaries and tuples.
How do you decide which one is appropriate - my current understanding doesn't let me dist... | How do I know what data type to use in Python? | 1 | 0 | 0 | 345 |
1,579,744 | 2009-10-16T18:48:00.000 | 0 | 0 | 1 | 0 | python,arrays,types,tuples | 1,579,758 | 5 | false | 0 | 0 | Do you really require speed/efficiency? Then go with a pure and simple dict. | 3 | 3 | 0 | I'm working through some tutorials on Python and am at a position where I am trying to decide what data type/structure to use in a certain situation.
I'm not clear on the differences between arrays, lists, dictionaries and tuples.
How do you decide which one is appropriate - my current understanding doesn't let me dist... | How do I know what data type to use in Python? | 0 | 0 | 0 | 345 |
1,579,744 | 2009-10-16T18:48:00.000 | 0 | 0 | 1 | 0 | python,arrays,types,tuples | 1,580,736 | 5 | false | 0 | 0 | Personal:
I mostly work with lists and dictionaries.
It seems that this satisfies most cases.
Sometimes:
Tuples can be helpful--if you want to pair/match elements. Besides that, I don't really use it.
However:
I write high-level scripts that don't need to drill down into the core "efficiency" where every byte and every... | 3 | 3 | 0 | I'm working through some tutorials on Python and am at a position where I am trying to decide what data type/structure to use in a certain situation.
I'm not clear on the differences between arrays, lists, dictionaries and tuples.
How do you decide which one is appropriate - my current understanding doesn't let me dist... | How do I know what data type to use in Python? | 0 | 0 | 0 | 345 |
1,579,919 | 2009-10-16T19:21:00.000 | 3 | 0 | 1 | 0 | python,arrays,list | 1,579,927 | 6 | false | 0 | 0 | Have you considered using a lightweight database like SQLite? | 1 | 6 | 0 | I want to create an object in python that is a collection of around 200,000,000 true/false values. So that I can most effectively change or recall any given true/false value, so that I can quickly determine if any given number, like 123,456,000 is true or false or change its value.
Is the best way to do this a list? or... | Extremely large Boolean list in Python | 0.099668 | 0 | 0 | 6,140 |
1,581,087 | 2009-10-17T00:50:00.000 | 0 | 0 | 0 | 0 | python,tcp,network-programming,network-protocols,raw-sockets | 1,581,097 | 5 | false | 0 | 0 | I know this isn't directly Python related but if you are looking to do heavy network processing, you should consider Erlang instead of Python. Just a suggestion really... you can always take a shot a doing this with Twisted... if you feel adventurous (and have lots of time on your side) ;-) | 1 | 8 | 0 | Is there a python library which implements a standalone TCP stack?
I can't use the usual python socket library because I'm receiving a stream of packets over a socket (they are being tunneled to me over this socket). When I receive a TCP SYN packet addressed to a particular port, I'd like to accept the connection (sen... | Python TCP stack implementation | 0 | 0 | 1 | 8,496 |
1,581,782 | 2009-10-17T09:04:00.000 | 0 | 0 | 0 | 0 | c#,python,windows,cross-platform,vlc | 1,582,934 | 2 | false | 0 | 1 | This is a bit OOT, but in Windows 7, shaking the active window will hide others to reveal the desktop (and so will clicking/hovering the rightmost taskbar button). Instead of hiding/moving vlc, you could just temporarily reveal the whole desktop. Shaking the active window again brings everything back. | 1 | 2 | 0 | I'm sure others have run into this problem too...
I often watch videos in a small VLC window while working on other tasks, but no matter where the window is placed, I eventually need to access something in the GUI behind it, and have to manually reposition the video window first.
This could be solved by having the VLC ... | Reposition a VLC window programmatically | 0 | 0 | 0 | 565 |
1,581,895 | 2009-10-17T10:21:00.000 | 1 | 0 | 1 | 0 | python,multithreading,queue | 1,581,902 | 13 | false | 0 | 0 | The way I solved this (actually I did this in Scala, not Python) was to use both a Set and a Queue, only adding links to the queue (and set) if they did not already exist in the set.
Both the set and queue were encapsulated in a single thread, exposing only a queue-like interface to the consumer threads.
Edit: someone ... | 5 | 17 | 0 | I'm writing a simple crawler in Python using the threading and Queue modules. I fetch a page, check links and put them into a queue, when a certain thread has finished processing page, it grabs the next one from the queue. I'm using an array for the pages I've already visited to filter the links I add to the queue, but... | How check if a task is already in python Queue? | 0.015383 | 0 | 1 | 12,544 |
1,581,895 | 2009-10-17T10:21:00.000 | 1 | 0 | 1 | 0 | python,multithreading,queue | 1,581,903 | 13 | false | 0 | 0 | SQLite is so simple to use and would fit perfectly... just a suggestion. | 5 | 17 | 0 | I'm writing a simple crawler in Python using the threading and Queue modules. I fetch a page, check links and put them into a queue, when a certain thread has finished processing page, it grabs the next one from the queue. I'm using an array for the pages I've already visited to filter the links I add to the queue, but... | How check if a task is already in python Queue? | 0.015383 | 0 | 1 | 12,544 |
1,581,895 | 2009-10-17T10:21:00.000 | -3 | 0 | 1 | 0 | python,multithreading,queue | 1,581,908 | 13 | false | 0 | 0 | Also, instead of a set you might try using a dictionary. Operations on sets tend to get rather slow when they're big, whereas a dictionary lookup is nice and quick.
My 2c. | 5 | 17 | 0 | I'm writing a simple crawler in Python using the threading and Queue modules. I fetch a page, check links and put them into a queue, when a certain thread has finished processing page, it grabs the next one from the queue. I'm using an array for the pages I've already visited to filter the links I add to the queue, but... | How check if a task is already in python Queue? | -0.046121 | 0 | 1 | 12,544 |
1,581,895 | 2009-10-17T10:21:00.000 | 1 | 0 | 1 | 0 | python,multithreading,queue | 1,581,920 | 13 | false | 0 | 0 | Why only use the array (ideally, a dictionary would be even better) to filter things you've already visited? Add things to your array/dictionary as soon as you queue them up, and only add them to the queue if they're not already in the array/dict. Then you have 3 simple separate things:
Links not yet seen (neither in ... | 5 | 17 | 0 | I'm writing a simple crawler in Python using the threading and Queue modules. I fetch a page, check links and put them into a queue, when a certain thread has finished processing page, it grabs the next one from the queue. I'm using an array for the pages I've already visited to filter the links I add to the queue, but... | How check if a task is already in python Queue? | 0.015383 | 0 | 1 | 12,544 |
1,581,895 | 2009-10-17T10:21:00.000 | 0 | 0 | 1 | 0 | python,multithreading,queue | 1,582,421 | 13 | false | 0 | 0 | instead of "array of pages already visited" make an "array of pages already added to the queue" | 5 | 17 | 0 | I'm writing a simple crawler in Python using the threading and Queue modules. I fetch a page, check links and put them into a queue, when a certain thread has finished processing page, it grabs the next one from the queue. I'm using an array for the pages I've already visited to filter the links I add to the queue, but... | How check if a task is already in python Queue? | 0 | 0 | 1 | 12,544 |
1,582,105 | 2009-10-17T12:33:00.000 | 0 | 1 | 0 | 0 | python,c,cython | 4,445,452 | 7 | false | 0 | 1 | Cython does not support threads well at all. It holds the GIL (Global Intrepreter Lock) the entire time! This makes your code thread-safe by (virtually) disabling concurrent execution. So I wouldn't use it for general purpose development. | 4 | 20 | 0 | I know a bunch of scripting languages, (python, ruby, lua, php) but I don't know any compiled languages like C/C++ , I wanted to try and speed up some python code using cython, which is essentially a python -> C compiler, aimed at creating C extensions for python. Basically you code in a stricter version of python whic... | Noob-Ready Cython Tutorials | 0 | 0 | 0 | 8,650 |
1,582,105 | 2009-10-17T12:33:00.000 | 0 | 1 | 0 | 0 | python,c,cython | 2,582,450 | 7 | false | 0 | 1 | About all the C that you really need to know is:
C types are much faster than Python types (adding to C ints or doubles can be done in a single clock cycle) but less safe (they are not arbitrarily sized and may silently overflow).
C function (cdef) calls are much faster than Python (def) function calls (but are less f... | 4 | 20 | 0 | I know a bunch of scripting languages, (python, ruby, lua, php) but I don't know any compiled languages like C/C++ , I wanted to try and speed up some python code using cython, which is essentially a python -> C compiler, aimed at creating C extensions for python. Basically you code in a stricter version of python whic... | Noob-Ready Cython Tutorials | 0 | 0 | 0 | 8,650 |
1,582,105 | 2009-10-17T12:33:00.000 | 1 | 1 | 0 | 0 | python,c,cython | 11,103,468 | 7 | false | 0 | 1 | You can do a lot of very useful things with Cython if you can answer the following C quiz...
(1) What is a double? What is an int?
(2) What does the word "compile" mean?
(3) What is a header (.h) file?
To answer these questions you don't need to read a whole C book! ...maybe chapter 1.
Once you can pass that quiz, try ... | 4 | 20 | 0 | I know a bunch of scripting languages, (python, ruby, lua, php) but I don't know any compiled languages like C/C++ , I wanted to try and speed up some python code using cython, which is essentially a python -> C compiler, aimed at creating C extensions for python. Basically you code in a stricter version of python whic... | Noob-Ready Cython Tutorials | 0.028564 | 0 | 0 | 8,650 |
1,582,105 | 2009-10-17T12:33:00.000 | 1 | 1 | 0 | 0 | python,c,cython | 10,643,399 | 7 | false | 0 | 1 | Cython does support concurrency (you can use native POSIX threads with c, that can be compiled in extent ion module) , you just need to be careful enough to not to modify any python objects when GIL is released and keep in mind the interpreter itself is not thread safe. You can also use multiprocessing with python to ... | 4 | 20 | 0 | I know a bunch of scripting languages, (python, ruby, lua, php) but I don't know any compiled languages like C/C++ , I wanted to try and speed up some python code using cython, which is essentially a python -> C compiler, aimed at creating C extensions for python. Basically you code in a stricter version of python whic... | Noob-Ready Cython Tutorials | 0.028564 | 0 | 0 | 8,650 |
1,582,708 | 2009-10-17T17:19:00.000 | 7 | 0 | 0 | 0 | python,ajax,django,timeout | 1,582,971 | 3 | true | 1 | 0 | Ajax doesn't require any particular technology on the server side. All you need is to return a response in some form that some Javascript on the client side can understand. JSON is an excellent choice here, as it's easy to create in Python (there's a json library in 2.6, and Django has django.utils.simplejson for other... | 1 | 5 | 0 | I've been programming Python a while, but DJango and web programming in general is new to me.
I have a very long operation performed in a Python view. Since the local() function in my view takes so long to return, there's an HTTP timeout. Fair enough, I understand that part.
What's the best way to give an HTTPresponse ... | Long, slow operation in Django view causes timeout. Any way for Python to speak AJAX instead? | 1.2 | 0 | 0 | 3,585 |
1,582,718 | 2009-10-17T17:24:00.000 | 3 | 1 | 0 | 0 | python,c,refactoring,profiling | 1,582,864 | 4 | false | 0 | 0 | There are lots of different ways that people approach development.
Sometimes people follow your three steps and discover that the slow bits are due to the external environment, therefore rewriting Python into C does not address the problem. That type of slowness can sometimes be solved on the system side, and sometime... | 3 | 4 | 0 | A popular software development pattern seems to be:
Thrash out the logic and algorithms in Python.
Profile to find out where the slow bits are.
Replace those with C.
Ship code that is the best trade-off between high-level and speedy.
I say popular simply because I've seen people talk about it as being a great idea.
B... | Best practice for the Python-then-profile-then-C design pattern? | 0.148885 | 0 | 0 | 279 |
1,582,718 | 2009-10-17T17:24:00.000 | 0 | 1 | 0 | 0 | python,c,refactoring,profiling | 1,582,784 | 4 | false | 0 | 0 | Step 3 is wrong. In the modern world, more than half the time "the slow bits" are I/O or network bound, or limited by some other resource outside the process. Rewriting them in anything is only going to introduce bugs. | 3 | 4 | 0 | A popular software development pattern seems to be:
Thrash out the logic and algorithms in Python.
Profile to find out where the slow bits are.
Replace those with C.
Ship code that is the best trade-off between high-level and speedy.
I say popular simply because I've seen people talk about it as being a great idea.
B... | Best practice for the Python-then-profile-then-C design pattern? | 0 | 0 | 0 | 279 |
1,582,718 | 2009-10-17T17:24:00.000 | 2 | 1 | 0 | 0 | python,c,refactoring,profiling | 1,583,268 | 4 | false | 0 | 0 | I also thought that way when I started using Python
I've done step 3 twice (that I can recall) in 12 years. Not often enough to call it a design pattern. Usually it's enough to wrap an existing C library. Usually someone else has already written the wrapper. | 3 | 4 | 0 | A popular software development pattern seems to be:
Thrash out the logic and algorithms in Python.
Profile to find out where the slow bits are.
Replace those with C.
Ship code that is the best trade-off between high-level and speedy.
I say popular simply because I've seen people talk about it as being a great idea.
B... | Best practice for the Python-then-profile-then-C design pattern? | 0.099668 | 0 | 0 | 279 |
1,583,284 | 2009-10-17T21:32:00.000 | 0 | 0 | 0 | 0 | python,audio,pygame | 1,583,298 | 3 | false | 1 | 1 | I think setting the separate channel volume is the only way. Pygame doesn't seem to have any notion of world space or positioning for sounds. | 1 | 2 | 0 | Is there a way to do panning or 3d sound in Pygame? The only way I've found to control sound playback is to set the volume for both the left and right channels. | positioning sound with pygame? | 0 | 0 | 0 | 2,176 |
1,583,350 | 2009-10-17T22:11:00.000 | 5 | 0 | 0 | 0 | python,sqlite,python-db-api | 1,583,379 | 2 | false | 0 | 0 | No, it's not the only way. Alternatively, you can also fetch one row, iterate over it, and inspect the individual column Python objects and types. Unless the value is None (in which case the SQL field is NULL), this should give you a fairly precise indication what the database column type was.
sqlite3 only uses sqlite3... | 1 | 5 | 0 | When using the sqlite3 module in python, all elements of cursor.description except the column names are set to None, so this tuple cannot be used to find the column types for a query result (unlike other DB-API compliant modules). Is the only way to get the types of the columns to use pragma table_info(table_name).fetc... | sqlite3 and cursor.description | 0.462117 | 1 | 0 | 3,955 |
1,585,181 | 2009-10-18T15:35:00.000 | 3 | 0 | 1 | 0 | python,multithreading,gil | 1,585,641 | 3 | false | 0 | 0 | Perhaps the confusion comes about because most people assume Python has one interpreter per process. I recall reading that the support for multiple interpreters via the C API was largely untested and hardly ever used. (And when I gave it a go, didn't work properly.) | 2 | 12 | 0 | I often see people talking that the GIL is per Python Interpreter (even here on stackoverflow).
But what I see in the source code it seems to be that the GIL is a global variable and therefore there is one GIL for all Interpreters in each python process. I know they did this because there is no interpreter object passe... | Is the Python GIL really per interpreter? | 0.197375 | 0 | 0 | 1,279 |
1,585,181 | 2009-10-18T15:35:00.000 | 12 | 0 | 1 | 0 | python,multithreading,gil | 1,585,939 | 3 | true | 0 | 0 | The GIL is indeed per-process, not per-interpreter. This is unchanged in 3.x. | 2 | 12 | 0 | I often see people talking that the GIL is per Python Interpreter (even here on stackoverflow).
But what I see in the source code it seems to be that the GIL is a global variable and therefore there is one GIL for all Interpreters in each python process. I know they did this because there is no interpreter object passe... | Is the Python GIL really per interpreter? | 1.2 | 0 | 0 | 1,279 |
1,585,756 | 2009-10-18T19:12:00.000 | 3 | 0 | 1 | 0 | python,import,python-3.x | 1,586,005 | 3 | true | 0 | 0 | You can use -m flag of the python interpreter to run modules in sub-packages (or even packages in 3.1.). | 2 | 7 | 0 | I've recently ported my Python project to run on Python 3.1. For that I had to adopt the policy of relative imports within the submodules and subpackages of my project. I've don’t that and now the project itself works, but I noticed I can't execute any of the subpackages or submodules in it. If I try, I get "builtins.V... | Python: Do relative imports mean you can't execute a subpackage by itself? | 1.2 | 0 | 0 | 1,966 |
1,585,756 | 2009-10-18T19:12:00.000 | 4 | 0 | 1 | 0 | python,import,python-3.x | 1,585,801 | 3 | false | 0 | 0 | Yes, it's normal. If you want to execute a module that is also a part of a package (in itself a strange thing to do) you need to have absolute imports. When you execute the module it is not, from the interpreters point of view, a part of a package, but the __main__ module. So it wouldn't know where the relative package... | 2 | 7 | 0 | I've recently ported my Python project to run on Python 3.1. For that I had to adopt the policy of relative imports within the submodules and subpackages of my project. I've don’t that and now the project itself works, but I noticed I can't execute any of the subpackages or submodules in it. If I try, I get "builtins.V... | Python: Do relative imports mean you can't execute a subpackage by itself? | 0.26052 | 0 | 0 | 1,966 |
1,586,008 | 2009-10-18T20:56:00.000 | 0 | 0 | 0 | 0 | php,python,ruby-on-rails,database | 1,586,035 | 4 | false | 1 | 0 | It would be great if code written for one platform would work on every other without any modification whatsoever, but this is usually not the case and probably never will be. What the current frameworks do is about all anyone can. | 3 | 2 | 0 | I start feeling old fashioned when I see all these SQL generating database abstraction layers and all those ORMs out there, although I am far from being old. I understand the need for them, but their use spreads to places they normally don't belong to.
I firmly believe that using database abstraction layers for SQL gen... | PHP, Python, Ruby application with multiple RDBMS | 0 | 1 | 0 | 369 |
1,586,008 | 2009-10-18T20:56:00.000 | 2 | 0 | 0 | 0 | php,python,ruby-on-rails,database | 1,586,105 | 4 | false | 1 | 0 | If you want to leverage the bells and whistles of various RDBMSes, you can certainly do it. Just apply standard OO Principles. Figure out what kind of API your persistence layer will need to provide.
You'll end up writing a set of isomorphic persistence adapter classes. From the perspective of your model code (whi... | 3 | 2 | 0 | I start feeling old fashioned when I see all these SQL generating database abstraction layers and all those ORMs out there, although I am far from being old. I understand the need for them, but their use spreads to places they normally don't belong to.
I firmly believe that using database abstraction layers for SQL gen... | PHP, Python, Ruby application with multiple RDBMS | 0.099668 | 1 | 0 | 369 |
1,586,008 | 2009-10-18T20:56:00.000 | 2 | 0 | 0 | 0 | php,python,ruby-on-rails,database | 1,587,887 | 4 | true | 1 | 0 | You cannot eat a cake and have it, choose on of the following options.
Use your database abstraction layer whenever you can and in the rare cases when you have a need for a hand-made query (eg. performance reasons) stick to the lowest common denominator and don't use stored procedures or any proprietary extensions tha... | 3 | 2 | 0 | I start feeling old fashioned when I see all these SQL generating database abstraction layers and all those ORMs out there, although I am far from being old. I understand the need for them, but their use spreads to places they normally don't belong to.
I firmly believe that using database abstraction layers for SQL gen... | PHP, Python, Ruby application with multiple RDBMS | 1.2 | 1 | 0 | 369 |
1,587,776 | 2009-10-19T09:42:00.000 | 1 | 1 | 1 | 0 | python,testing,dependencies,circular-dependency | 1,588,192 | 3 | false | 0 | 0 | "We want to test LibA using LibT, but because LibT depends on LibA, we'd rather it to use a stable version of LibA, while testing LibT "
It doesn't make sense to use T + A to test A. What does make sense is the following.
LibA is really two things mashed together: A1 and A2.
T depends on A1.
What's really happening i... | 1 | 5 | 0 | We've got a python library that we're developing. During development, I'd like to use some parts of that library in testing the newer versions of it. That is, use the stable code in order to test the development code. Is there any way of doing this in python?
Edit: To be more specific, we've got a library (LibA) that h... | Using different versions of a python library in the same process | 0.066568 | 0 | 0 | 680 |
1,587,902 | 2009-10-19T10:13:00.000 | -1 | 0 | 0 | 0 | python,diff,webpage,snapshot | 1,588,461 | 4 | false | 1 | 0 | just take snapshots of the files with MD5 or SHA1...if the values differ the next time you check, then they are modified. | 1 | 6 | 0 | I have snapshots of multiple webpages taken at 2 times. What is a reliable method to determine which webpages have been modified?
I can't rely on something like an RSS feed, and I need to ignore minor noise like date text.
Ideally I am looking for a Python solution, but an intuitive algorithm would also be great.
Than... | how to determine if webpage has been modified | -0.049958 | 0 | 1 | 2,946 |
1,587,991 | 2009-10-19T10:42:00.000 | 2 | 1 | 1 | 0 | python | 1,588,007 | 2 | true | 0 | 0 | This is what Apache is for.
Create a directory that will have the reports.
Configure Apache to serve files from that directory.
If the report exists, redirect to a URL that Apache will serve.
Otherwise, the report doesn't exist, so create it. Then redirect to a URL that Apache will serve.
There's no "hashing". You h... | 1 | 1 | 0 | I have a web server that is dynamically creating various reports in several formats (pdf and doc files). The files require a fair amount of CPU to generate, and it is fairly common to have situations where two people are creating the same report with the same input.
Inputs:
raw data input as a string (equations, numbe... | Caching system for dynamically created files? | 1.2 | 0 | 0 | 141 |
1,588,708 | 2009-10-19T13:36:00.000 | 2 | 0 | 0 | 1 | python,google-app-engine,couchdb | 1,588,748 | 3 | false | 1 | 0 | Consider the situation where you have many entity types but few instances of each entity. In this case you will have many tables each with a few records so a relational approach is not suitable. | 2 | 3 | 0 | I'm looking at using CouchDB for one project and the GAE app engine datastore in the other. For relational stuff I tend to use postgres, although I much prefer an ORM.
Anyway, what use cases suit non relational datastores best? | What are the use cases for non relational datastores? | 0.132549 | 1 | 0 | 587 |
1,588,708 | 2009-10-19T13:36:00.000 | 0 | 0 | 0 | 1 | python,google-app-engine,couchdb | 1,589,186 | 3 | false | 1 | 0 | In some cases that are simply nice. ZODB is a Python-only object database, that is so well-integrated with Python that you can simply forget that it's there. You don't have to bother about it, most of the time. | 2 | 3 | 0 | I'm looking at using CouchDB for one project and the GAE app engine datastore in the other. For relational stuff I tend to use postgres, although I much prefer an ORM.
Anyway, what use cases suit non relational datastores best? | What are the use cases for non relational datastores? | 0 | 1 | 0 | 587 |
1,589,150 | 2009-10-19T14:54:00.000 | 0 | 0 | 0 | 0 | python,xml-rpc | 1,590,010 | 3 | false | 0 | 0 | There are several choices:
Use single-process-single-thread server like SimpleXMLRPCServer to process requests subsequently.
Use threading.Lock() in threaded server.
You some external locking mechanism (like lockfile module or GET_LOCK() function in mysql) in multiprocess server. | 2 | 7 | 0 | I'm looking for a way to prevent multiple hosts from issuing simultaneous commands to a Python XMLRPC listener. The listener is responsible for running scripts to perform tasks on that system that would fail if multiple users tried to issue these commands at the same time. Is there a way I can block all incoming reques... | Python XMLRPC with concurrent requests | 0 | 0 | 1 | 5,976 |
1,589,150 | 2009-10-19T14:54:00.000 | 0 | 0 | 0 | 0 | python,xml-rpc | 1,589,181 | 3 | false | 0 | 0 | Can you have another communication channel? If yes, then have a "call me back when it is my turn" protocol running between the server and the clients.
In other words, each client would register its intention to issue requests to the server and the said server would "callback" the next-up client when it is ready. | 2 | 7 | 0 | I'm looking for a way to prevent multiple hosts from issuing simultaneous commands to a Python XMLRPC listener. The listener is responsible for running scripts to perform tasks on that system that would fail if multiple users tried to issue these commands at the same time. Is there a way I can block all incoming reques... | Python XMLRPC with concurrent requests | 0 | 0 | 1 | 5,976 |
1,589,743 | 2009-10-19T16:33:00.000 | 0 | 0 | 0 | 1 | python,google-app-engine | 4,219,064 | 5 | false | 1 | 0 | If you develop with web2py your code will run GAE other architectures wihtout changes using any of the 10 supported relational databases. The compatibility layer covers database api (including blobs and listproperty), email, and fetching). | 1 | 6 | 0 | I'm planning an application running on Google App Engine. The only worry I would have is portability. Or just the option to have the app run on a local, private cluster.
I expected an option for Google App Engine applications to run on other systems, a compatibility layer, to spring up. I could imagine a GAE compatibl... | Google App Engine compatibility layer | 0 | 0 | 0 | 702 |
1,590,474 | 2009-10-19T19:03:00.000 | 1 | 0 | 0 | 1 | python,windows-xp,scheduled-tasks | 1,591,169 | 7 | false | 0 | 0 | At the risk of not answering your question, can I suggest that if what you have to run is important or even critical then Windows task-Scheduler is not the way to run it.
There are so many awful flows when using the task-scheduler. Lets just start with the obvious ones:
There is no logging. There is no way to investig... | 4 | 1 | 0 | I have a Scheduled Task on a WinXP SP2 machine that is set up to run a python script:
Daily
Start time: 12:03 AM
Schedule task daily: every 1 day
Start date: some time in the past
Repeat task: every 5 minutes
Until: Duration 24 hours
Basically, i want the script to run every five minutes, for ever.
My problem is the ta... | Scheduled tasks in Win32 | 0.028564 | 0 | 0 | 3,296 |
1,590,474 | 2009-10-19T19:03:00.000 | 1 | 0 | 0 | 1 | python,windows-xp,scheduled-tasks | 1,590,518 | 7 | false | 0 | 0 | On the first pane (labeled "Task") do you have "Run only if logged on" unchecked and "Enabled (scheduled task runs at specified time" checked?
I've run python jobs via Windows scheduled task with settings very similar to what you show. | 4 | 1 | 0 | I have a Scheduled Task on a WinXP SP2 machine that is set up to run a python script:
Daily
Start time: 12:03 AM
Schedule task daily: every 1 day
Start date: some time in the past
Repeat task: every 5 minutes
Until: Duration 24 hours
Basically, i want the script to run every five minutes, for ever.
My problem is the ta... | Scheduled tasks in Win32 | 0.028564 | 0 | 0 | 3,296 |
1,590,474 | 2009-10-19T19:03:00.000 | 1 | 0 | 0 | 1 | python,windows-xp,scheduled-tasks | 1,590,558 | 7 | false | 0 | 0 | Also, for the past year or so I've seen a common bug where Scheduled Tasks on Server 2003 or XP do not run if either of the following checkboxes are on:
"Don't start the task if the computer is running on batteries"
"Stop the task if battery mode begins"
It seems that Windows gets a little confused if you have a batt... | 4 | 1 | 0 | I have a Scheduled Task on a WinXP SP2 machine that is set up to run a python script:
Daily
Start time: 12:03 AM
Schedule task daily: every 1 day
Start date: some time in the past
Repeat task: every 5 minutes
Until: Duration 24 hours
Basically, i want the script to run every five minutes, for ever.
My problem is the ta... | Scheduled tasks in Win32 | 0.028564 | 0 | 0 | 3,296 |
1,590,474 | 2009-10-19T19:03:00.000 | 1 | 0 | 0 | 1 | python,windows-xp,scheduled-tasks | 1,590,873 | 7 | false | 0 | 0 | Until: Duration 24 hours
That shuts it off at the end of the first day.
Remove that, see if it keeps going. It should, and you shouldn't need to install Python in the process. :) | 4 | 1 | 0 | I have a Scheduled Task on a WinXP SP2 machine that is set up to run a python script:
Daily
Start time: 12:03 AM
Schedule task daily: every 1 day
Start date: some time in the past
Repeat task: every 5 minutes
Until: Duration 24 hours
Basically, i want the script to run every five minutes, for ever.
My problem is the ta... | Scheduled tasks in Win32 | 0.028564 | 0 | 0 | 3,296 |
1,591,555 | 2009-10-19T22:47:00.000 | 1 | 1 | 1 | 0 | php,python,multithreading | 1,591,593 | 3 | false | 0 | 0 | If you are on a sane operating system then shared libraries should only be loaded once and shared among all processes using them. Memory for data structures and connection handles will obviously be duplicated, but the overhead of stopping and starting the systems may be greater than keeping things up while idle. If y... | 2 | 3 | 0 | Right now I'm running 50 PHP (in CLI mode) individual workers (processes) per machine that are waiting to receive their workload (job). For example, the job of resizing an image. In workload they receive the image (binary data) and the desired size. The worker does it's work and returns the resized image back. Then it ... | From PHP workers to Python threads | 0.066568 | 0 | 0 | 958 |
1,591,555 | 2009-10-19T22:47:00.000 | 4 | 1 | 1 | 0 | php,python,multithreading | 1,591,616 | 3 | true | 0 | 0 | Most probably - yes. But don't assume you have to do multithreading. Have a look at the multiprocessing module. It already has an implementation of a Pool included, which is what you could use. And it basically solves the GIL problem (multithreading can run only 1 "standard python code" at any time - that's a very simp... | 2 | 3 | 0 | Right now I'm running 50 PHP (in CLI mode) individual workers (processes) per machine that are waiting to receive their workload (job). For example, the job of resizing an image. In workload they receive the image (binary data) and the desired size. The worker does it's work and returns the resized image back. Then it ... | From PHP workers to Python threads | 1.2 | 0 | 0 | 958 |
1,591,579 | 2009-10-19T22:52:00.000 | 2 | 0 | 0 | 0 | python,xml,io | 1,591,732 | 9 | false | 0 | 0 | To make this process more robust, you could consider using the SAX parser (that way you don't have to hold the whole file in memory), read & write till the end of tree and then start appending. | 1 | 49 | 0 | I have an XML document that I would like to update after it already contains data.
I thought about opening the XML file in "a" (append) mode. The problem is that the new data will be written after the root closing tag.
How can I delete the last line of a file, then start writing data from that point, and then close the... | How to update/modify an XML file in python? | 0.044415 | 0 | 1 | 153,237 |
1,591,762 | 2009-10-19T23:51:00.000 | 1 | 0 | 1 | 0 | python | 1,592,512 | 3 | false | 0 | 0 | You haven't made it completely clear what you need. It sounds like itertools should have what you need. Perhaps what you wish is an itertools.combinations of the itertools.product of the lists in your big list.
@fortran: you can't have a set of sets. You can have a set of frozensets, but depending on what it really me... | 2 | 2 | 1 | I have a list. It contains x lists, each with y elements.
I want to pair each element with all the other elements, just once, (a,b = b,a)
EDIT: this has been criticized as being too vague.So I'll describe the history.
My function produces random equations and using genetic techniques, mutates and crossbreeds them, sele... | How to make all combinations of the elements in an array? | 0.066568 | 0 | 0 | 598 |
1,591,762 | 2009-10-19T23:51:00.000 | 0 | 0 | 1 | 0 | python | 1,591,802 | 3 | false | 0 | 0 | First of all, please don't refer to this as an "array". You are using a list of lists. In Python, an array is a different type of data structure, provided by the array module.
Also, your application sounds suspiciously like a matrix. If you are really doing matrix manipulations, you should investigate the Numpy packag... | 2 | 2 | 1 | I have a list. It contains x lists, each with y elements.
I want to pair each element with all the other elements, just once, (a,b = b,a)
EDIT: this has been criticized as being too vague.So I'll describe the history.
My function produces random equations and using genetic techniques, mutates and crossbreeds them, sele... | How to make all combinations of the elements in an array? | 0 | 0 | 0 | 598 |
1,593,019 | 2009-10-20T07:40:00.000 | 12 | 1 | 1 | 1 | python,unix,shell,benchmarking | 5,544,739 | 12 | false | 0 | 0 | I usually do a quick time ./script.py to see how long it takes. That does not show you the memory though, at least not as a default. You can use /usr/bin/time -v ./script.py to get a lot of information, including memory usage. | 1 | 105 | 0 | Usually I use shell command time. My purpose is to test if data is small, medium, large or very large set, how much time and memory usage will be.
Any tools for Linux or just Python to do this? | Is there any simple way to benchmark Python script? | 1 | 0 | 0 | 101,454 |
1,593,483 | 2009-10-20T09:33:00.000 | 2 | 0 | 0 | 1 | python,google-app-engine | 1,593,985 | 2 | true | 1 | 0 | You should generally be doing everything within some sort of RequestHandler or the equivalent in your non-WebApp framework. However, if you really insist on being stuck in the early 1990s and writing plain CGI scripts, the environment variables SERVER_NAME and PATH_INFO may be what you want; see a CGI reference for mo... | 1 | 1 | 0 | So, within a webapp.RequestHandler subclass I would use self.request.uri to get the request URI. But, I can't access this outside of a RequestHandler and so no go. Any ideas?
I'm running Python and I'm new at it as well as GAE. | Get the request uri outside of a RequestHandler in Google App Engine (Python) | 1.2 | 0 | 1 | 786 |
1,594,604 | 2009-10-20T13:27:00.000 | 3 | 0 | 0 | 0 | python,performance,optimization,file-io | 1,594,704 | 7 | false | 0 | 0 | If you are I/O bound, the best way I have found to optimize is to read or write the entire file into/out of memory at once, then operate out of RAM from there on.
With extensive testing I found that my runtime eded up bound not by the amount of data I read from/wrote to disk, but by the number of I/O operations I used ... | 5 | 3 | 1 | I have a python program that does something like this:
Read a row from a csv file.
Do some transformations on it.
Break it up into the actual rows as they would be written to the database.
Write those rows to individual csv files.
Go back to step 1 unless the file has been totally read.
Run SQL*Loader and load those f... | How should I optimize this filesystem I/O bound program? | 0.085505 | 1 | 0 | 2,504 |
1,594,604 | 2009-10-20T13:27:00.000 | 1 | 0 | 0 | 0 | python,performance,optimization,file-io | 1,595,358 | 7 | false | 0 | 0 | Use buffered writes for step 4.
Write a simple function that simply appends the output onto a string, checks the string length, and only writes when you have enough which should be some multiple of 4k bytes. I would say start with 32k buffers and time it.
You would have one buffer per file, so that most "writes" won't ... | 5 | 3 | 1 | I have a python program that does something like this:
Read a row from a csv file.
Do some transformations on it.
Break it up into the actual rows as they would be written to the database.
Write those rows to individual csv files.
Go back to step 1 unless the file has been totally read.
Run SQL*Loader and load those f... | How should I optimize this filesystem I/O bound program? | 0.028564 | 1 | 0 | 2,504 |
1,594,604 | 2009-10-20T13:27:00.000 | 3 | 0 | 0 | 0 | python,performance,optimization,file-io | 1,595,626 | 7 | true | 0 | 0 | Python already does IO buffering and the OS should handle both prefetching the input file and delaying writes until it needs the RAM for something else or just gets uneasy about having dirty data in RAM for too long. Unless you force the OS to write them immediately, like closing the file after each write or opening t... | 5 | 3 | 1 | I have a python program that does something like this:
Read a row from a csv file.
Do some transformations on it.
Break it up into the actual rows as they would be written to the database.
Write those rows to individual csv files.
Go back to step 1 unless the file has been totally read.
Run SQL*Loader and load those f... | How should I optimize this filesystem I/O bound program? | 1.2 | 1 | 0 | 2,504 |
1,594,604 | 2009-10-20T13:27:00.000 | 2 | 0 | 0 | 0 | python,performance,optimization,file-io | 1,597,062 | 7 | false | 0 | 0 | Can you use a ramdisk for step 4? Low millions sounds doable if the rows are less than a couple of kB or so. | 5 | 3 | 1 | I have a python program that does something like this:
Read a row from a csv file.
Do some transformations on it.
Break it up into the actual rows as they would be written to the database.
Write those rows to individual csv files.
Go back to step 1 unless the file has been totally read.
Run SQL*Loader and load those f... | How should I optimize this filesystem I/O bound program? | 0.057081 | 1 | 0 | 2,504 |
1,594,604 | 2009-10-20T13:27:00.000 | 1 | 0 | 0 | 0 | python,performance,optimization,file-io | 1,597,281 | 7 | false | 0 | 0 | Isn't it possible to collect a few thousand rows in ram, then go directly to the database server and execute them?
This would remove the save to and load from the disk that step 4 entails.
If the database server is transactional, this is also a safe way to do it - just have the database begin before your first row and... | 5 | 3 | 1 | I have a python program that does something like this:
Read a row from a csv file.
Do some transformations on it.
Break it up into the actual rows as they would be written to the database.
Write those rows to individual csv files.
Go back to step 1 unless the file has been totally read.
Run SQL*Loader and load those f... | How should I optimize this filesystem I/O bound program? | 0.028564 | 1 | 0 | 2,504 |
1,594,827 | 2009-10-20T14:01:00.000 | 15 | 0 | 1 | 0 | python,build,distutils | 1,594,902 | 4 | true | 0 | 0 | For pre-deletion, just delete it with distutils.dir_util.remove_tree before calling setup.
For post-delete, I assume you only want to post-delete after selected commands. Subclass the respective command, override its run method (to invoke remove_tree after calling the base run), and pass the new command into the cmdcla... | 1 | 63 | 0 | How could I make my setup.py pre-delete and post-delete the build directory? | Cleaning build directory in setup.py | 1.2 | 0 | 0 | 61,211 |
1,596,911 | 2009-10-20T19:52:00.000 | 2 | 0 | 0 | 0 | python,html,django,ms-word | 1,597,120 | 6 | false | 1 | 0 | It depends how much formatting and images you're dealing with. I do one of a couple things:
Google Docs: Probably the closest you'll get to the original formatting and usable HTML.
Markdown: Abandon formatting. Paste it into a plain text editor, run it through Markdown and fix the rest by hand. | 2 | 13 | 0 | Every now and then I receive a Word Document that I have to display as a web page. I'm currently using Django's flatpages to achieve this by grabbing the html content generated by MS Word. The generated html is quite messy. Is there a better way that can generate very simple html to solve this issue using Python? | How do you convert a Word Document into very simple html in Python? | 0.066568 | 0 | 0 | 26,350 |
1,596,911 | 2009-10-20T19:52:00.000 | 2 | 0 | 0 | 0 | python,html,django,ms-word | 8,174,432 | 6 | false | 1 | 0 | Word 2010 has the ability to "save as filtered web page". This will eliminate the overwhelming majority of the HTML that Word inserts. | 2 | 13 | 0 | Every now and then I receive a Word Document that I have to display as a web page. I'm currently using Django's flatpages to achieve this by grabbing the html content generated by MS Word. The generated html is quite messy. Is there a better way that can generate very simple html to solve this issue using Python? | How do you convert a Word Document into very simple html in Python? | 0.066568 | 0 | 0 | 26,350 |
1,597,093 | 2009-10-20T20:27:00.000 | 0 | 0 | 1 | 0 | python,proxy,download,multithreading,harvest | 1,597,142 | 3 | false | 0 | 1 | Is this something you can't just do by passing a URL to newly spawned threads and calling urllib2.urlopen in each one, or is there a more specific requirement? | 1 | 0 | 0 | What would be the best library for multithreaded harvesting/downloading with multiple proxy support? I've looked at Tkinter, it looks good but there are so many, does anyone have a specific recommendation? Many thanks! | Multithreaded Downloading Through Proxies In Python | 0 | 0 | 0 | 940 |
1,597,833 | 2009-10-20T23:18:00.000 | 6 | 0 | 0 | 0 | python,bots | 1,597,878 | 4 | false | 0 | 0 | It doesn't have to be Python, I've seen it done in PHP and Perl, and you can probably do it in many other languages.
The general approach is:
1) You give your app a URL and it makes an HTTP request to that URL. I think I have seen this done with php/wget. Probably many other ways to do it.
2) Scan the HTTP response for... | 1 | 17 | 0 | I simply want to create an automatic script that can run (preferably) on a web-server, and simply 'clicks' on an object of a web page. I am new to Python or whatever language this would be used for so I thought I would go here to ask where to start! This may seem like I want the script to scam advertisements or do some... | Where do I start with a web bot? | 1 | 0 | 1 | 23,157 |
1,598,445 | 2009-10-21T02:32:00.000 | 0 | 0 | 1 | 0 | python,visual-studio,visual-studio-2008,ironpython | 39,940,667 | 3 | false | 0 | 0 | Only the print command is able to read such functions properly in python . so, a tab command can be used along with the print command. To get a space when one uses a tab function. | 3 | 3 | 0 | I have some IronPython scripts that are embedded in a C# project, and it would be convenient to be able to edit them in the VS editor. VS evidently knows about Python because it provides syntax coloring for it. Unfortunately however the editor uses tab characters for indentation, whereas I want spaces. Is there a setti... | How to use tabs-as-spaces in Python in Visual Studio 2008? | 0 | 0 | 0 | 1,336 |
1,598,445 | 2009-10-21T02:32:00.000 | 5 | 0 | 1 | 0 | python,visual-studio,visual-studio-2008,ironpython | 1,598,477 | 3 | true | 0 | 0 | Here is one way to do it, probably not the best. On the Tools -> Text Editor -> File extension part of the Options menu add a .py extension, and set an type of editor. You don't get a python editor type, but you can pick one of the ones you use less often (for me this would be VB.net), and then make sure that the tab s... | 3 | 3 | 0 | I have some IronPython scripts that are embedded in a C# project, and it would be convenient to be able to edit them in the VS editor. VS evidently knows about Python because it provides syntax coloring for it. Unfortunately however the editor uses tab characters for indentation, whereas I want spaces. Is there a setti... | How to use tabs-as-spaces in Python in Visual Studio 2008? | 1.2 | 0 | 0 | 1,336 |
1,598,445 | 2009-10-21T02:32:00.000 | 0 | 0 | 1 | 0 | python,visual-studio,visual-studio-2008,ironpython | 1,598,460 | 3 | false | 0 | 0 | Tools -> Options -> Text Editor -> Choose Language ( you might need to choose All Languages )
Click on Tabs and set it how you want it.
Edit: Looks like you can add your own file types in the same area and set Tab setting specifically for them. | 3 | 3 | 0 | I have some IronPython scripts that are embedded in a C# project, and it would be convenient to be able to edit them in the VS editor. VS evidently knows about Python because it provides syntax coloring for it. Unfortunately however the editor uses tab characters for indentation, whereas I want spaces. Is there a setti... | How to use tabs-as-spaces in Python in Visual Studio 2008? | 0 | 0 | 0 | 1,336 |
1,599,060 | 2009-10-21T06:34:00.000 | 7 | 0 | 1 | 0 | python,datetime,timestamp,utc | 1,715,510 | 2 | false | 0 | 0 | Actually, ntplib computes this offset accounting for round-trip delay.
It's available through the "offset" attribute of the NTP response. Therefore the result should not very wildly. | 1 | 13 | 0 | I wrote a desktop application and was using datetime.datetime.utcnow() for timestamping, however I've recently noticed that some people using the application get wildly different results than I do when we run the program at the same time. Is there any way to get the UTC time locally without using urllib to fetch it fr... | How can I get an accurate UTC time with Python? | 1 | 0 | 0 | 12,794 |
1,599,962 | 2009-10-21T10:29:00.000 | 26 | 0 | 1 | 0 | python | 1,599,973 | 1 | true | 0 | 0 | You are looking for sys.excepthook:
sys.excepthook(type, value, traceback)
This function prints out a given traceback and exception to sys.stderr.
When an exception is raised and uncaught, the interpreter calls sys.excepthook with three arguments, the exception class, exception instance, and a traceback object. In an ... | 1 | 19 | 0 | For an uncaught exception, Python by default prints a stack trace, the exception itself, and terminates. Is anybody aware of a way to tailor this behaviour on the program level (other than establishing my own global, catch-all exception handler), so that the stack trace is omitted? I would like to toggle in my app whet... | Configuring Python's default exception handling | 1.2 | 0 | 0 | 3,327 |
1,601,308 | 2009-10-21T14:43:00.000 | 1 | 1 | 0 | 0 | python,unit-testing,sqlite | 1,601,338 | 5 | false | 0 | 0 | Use some sort of database configuration and configure which database to use, and configure the in-memory database during unit tests. | 2 | 1 | 0 | I'm using a config file to get the info for my database. It always gets the hostname and then figures out what database options to use from this config file. I want to be able to tell if I'm inside a unittest here and use the in memory sqlite database instead. Is there a way to tell at that point whether I'm inside ... | Is there a way to tell whether a function is getting executed in a unittest? | 0.039979 | 0 | 0 | 108 |
1,601,308 | 2009-10-21T14:43:00.000 | 0 | 1 | 0 | 0 | python,unit-testing,sqlite | 1,601,336 | 5 | false | 0 | 0 | This is kind of brute force but it works. Have an environmental variable UNIT_TEST that your code checks, and set it inside your unit test driver. | 2 | 1 | 0 | I'm using a config file to get the info for my database. It always gets the hostname and then figures out what database options to use from this config file. I want to be able to tell if I'm inside a unittest here and use the in memory sqlite database instead. Is there a way to tell at that point whether I'm inside ... | Is there a way to tell whether a function is getting executed in a unittest? | 0 | 0 | 0 | 108 |
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