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Python : Basically , I 'm trying to do remove any lists that begin with the same value . For example , two of the below begin with the number 1 : Because the value 1 exists at the start of two of the lists -- I need to remove both so that the new list becomes : How can I do this ? I 've tried the below , but the output... | Removing dupes in list of lists in Python |
Python : I know that questions about rounding in python have been asked multiple times already , but the answers did not help me . I 'm looking for a method that is rounding a float number half up and returns a float number . The method should also accept a parameter that defines the decimal place to round to . I wrote... | Python 3.x rounding half up |
Python : In Python 3.7 int ( x-1 ) == x is True for x = 5e+17Why is this so and how do I prevent this bug ? To reproduce , paste this into your Python console : ( I am using int because x is the result of a division and I need to parse it as int . ) <code> int ( 5e+17-1 ) == 5e+17 > True | Why is int ( x-1 ) == x True in Python 3.7 with some values of x ? |
Python : I wanted to work on a small project to challenge my computer vision and image processing skills . I came across a project where I want to remove the hidden marks from the image . Hidden here refers to the watermarks that are not easily visible in rgb space but when you convert into hsv or some other space the ... | How to remove hidden marks from images using python opencv ? |
Python : I 'm a beginning programmer in python and have a question about my code I 'm writing : When I run this program I also get 9 , 15 21 as output . But these are not prime numbers . What is wrong with my code ? Thanks ! <code> number = int ( input ( `` Enter a random number : `` ) ) for num in range ( 1 , number +... | Prime Numbers python |
Python : If i run following on python2.7 console it giving me output as : While i am running same operation in python3.5.2I want to know why in python2.7.12 print statement giving me only 0.2 but in python3.5.2 print function giving me 0.19999999999999996 . <code> > > > 1.2 - 1.00.19999999999999996 > > > print 1.2 - 1.... | Why does the print function in Python3 round a decimal number ? |
Python : I ’ m working with sympy on a symbolic jacobian matrix J of size QxQ . Each coefficient of this matrix contains Q symbols , from f [ 0 ] to f [ Q-1 ] . What I ’ d like to do is to substitute every symbol in every coefficient of J with known values g [ 0 ] to g [ Q-1 ] ( which are no more symbols ) . The fastes... | Slow substitution of symbolic matrix with sympy |
Python : I 'm getting a really weird problem with P4Python since I started implementing workspace awareness.The situation is as follows : I have a `` P4Commands '' module which inherits P4 and connects in the __init__ ( ) Then , I have respectively the following classes : P4UserP4WorkspaceP4ChangelistThe P4Commands mod... | File ( s ) not on client |
Python : I 'm using Django and Neo4j together with neomodel as the OGM ( ORM for graphs ) . It 's working nicely but when it comes to testing , Neomodel does n't support the usual Django behavior with the relational databases . I mean that it does n't create a temporal Neo4j instance that is created at the beginning of... | Neo4j and Django testing |
Python : I would like to scrape a table from the Ligue 1 football website . Specifically the table which contains information on cards and referees . http : //www.ligue1.com/LFPStats/stats_arbitre ? competition=D1I am using the following code : This returns another table somewhere else in the html . I have tried to cir... | Ca n't Scrape a Specific Table using BeautifulSoup4 ( Python 3 ) |
Python : In numpy , I have an array that can be either 2-D or 3-D , and I would like to reduce it to 2-D while squaring each element . So I tried this and it does n't work : It returns this error : I suppose einsum does n't assume that when the ellipsis goes away in the right hand side , I want to sum over the ellipsis... | Summing over ellipsis broadcast dimension in numpy.einsum |
Python : Consider we 've got a bunch of subtress that look like this : I 'm trying to figure how to code a merge function such as doing something like this : will produce : but doing something like this : would produce : Said otherwise , loading the subtrees in the same order will always produce the same tree but if yo... | How to create a tree from a list of subtrees ? |
Python : After reading this question , I noticed that S. Lott might have liked to use an “ ordered defaultdict ” , but it does n't exist . Now , I wonder : Why do we have so many dict classes in Python ? dictblist.sorteddictcollections.OrderedDictcollections.defaultdictweakref.WeakKeyDictionaryweakref.WeakValueDictiona... | Why are n't Python dicts unified ? |
Python : Is it possible to test methods inside interactive python and retain blank lines within them ? This gives the familiar errorSo , yes a workaround is to remove all blank lines inside functions . I 'd like to know if that were truly mandatory to be able to run in interactive mode/REPL.thanks <code> def f1 ( ) : i... | How to configure interactive python to allow blank lines inside methods |
Python : Assume I have the following DataFrameI need to return a second DataFrame that lists the number of occurrences of A and B by day . i.e.I have a feeling this involves `` groupby '' , but I dont know enough about it to get it into the format above ^ <code> dic = { `` Date '' : [ `` 04-Jan-16 '' , `` 04-Jan-16 '' ... | Pandas : return number of occurrences by date |
Python : I understand that given an iterable such asI can turn it into a list and slice off the ends at arbitrary points with , for exampleor reverse it withor combine the two withHowever , trying to accomplish this in a single operation produces in some results that puzzle me : Only after much trial and error , do I g... | Mysterious interaction between Python 's slice bounds and `` stride '' |
Python : I 've been playing around with Cython in preparation for other work . I tried a simple test case and noticed something odd with the way my code performs for larger problem sizes . I created a simple min/max function that calculates the min and max of a 2D float32 array and compared it to running numpy.min ( a ... | Cython vs numpy performance scaling |
Python : I recently made the switch from python 2 to python 3 . Python 3 documentation reads : `` Removed reload ( ) . Use imp.reload ( ) '' It does n't really say why though.This question describes how it 's done now in python 3 . Does anyone have any idea why it 's been removed from the built-ins and now requires imp... | Why was reload removed from python builtins in the switch to python3 ? |
Python : PrefaceI have a test where I 'm working with nested iterables ( by nested iterable I mean iterable with only iterables as elements ) . As a test cascade considerE.g . foo may be simple identity functionand contract is simply checks that flattened iterables have same elementsBut if some of nested_iterable eleme... | deep copy nested iterable ( or improved itertools.tee for iterable of iterables ) |
Python : Let 's say I want to open a text file for reading using the following syntax : But if I detect that it ends with .gz , I would call gzip.open ( ) . If `` do something '' part is long and not convenient to write in a function ( e.g . it would create a nested function , which can not be serialized ) , what is th... | python : `` with '' syntax for opening files with two functions |
Python : I 'm doing a bit more complex operation on a dataframe where I compare two rows which can be anywhere in the frame.Here 's an example : Now what I am doing here is that I have pairings of strings in A and B , for example a_c which I call AB . And I have the reverse pairing c_a as well . I sum over the numbers ... | Pandas : Get the only value of a series or nan if it does not exist |
Python : my very first day with Python.I like to filter on a trace file generated by C.Each double from C is formatted in the file bytwo hex strings representing 32 bit of the 64 double.e.g . 1234567890.3 ( C double ) inside file : How can I parse and combine it to further work with a Python float ? Thanks in advance <... | Converting from a C double transferred in two hex strings |
Python : I am using datetime in some Python udfs that I use in my pig script . So far so good . I use pig 12.0 on Cloudera 5.5However , I also need to use the pytz or dateutil packages as well and they dont seem to be part of a vanilla python install . Can I use them in my Pig udfs in some ways ? If so , how ? I think ... | Pig : is it possible to use pytz or dateutils for Python udfs ? |
Python : I tried it on virtualenv : <code> ( venv ) $ pip install Django==1.0.4Downloading/unpacking Django==1.0.4 Could not find a version that satisfies the requirement Django==1.0.4 ( from versions : ) No distributions matching the version for Django==1.0.4Storing complete log in /home/tokibito/.pip/pip.log | Why is Django 1.0.x not able to install from PyPI ? |
Python : BackgroundThe Python 3 documentation clearly describes how the metaclass of a class is determined : if no bases and no explicit metaclass are given , then type ( ) is used if an explicit metaclass is given and it is not an instance of type ( ) , then it is used directly as the metaclass if an instance of type ... | Why does the class definition 's metaclass keyword argument accept a callable ? |
Python : I want to enforce that all items in a list are of type x . What would be the best way to do this ? Currently I am doing an assert like the following : Where int is the type I 'm trying to enforce here . Is there a better way to do this ? <code> a = [ 1,2,3,4,5 ] assert len ( a ) == len ( [ i for i in a if isin... | How to check to make sure all items in a list are of a certain type |
Python : This dictionary corresponds with numbered nodes : Using two print statements , I want to print marked and unmarked nodes as follows : Marked nodes : 0 1 2 6 7Unmarked nodes : 3 4 5 8 9I want something close to : <code> { 0 : True , 1 : True , 2 : True , 3 : False , 4 : False , 5 : False , 6 : True , 7 : True ,... | How to print with inline if statement ? |
Python : There is a puzzle which I am writing code to solve that goes as follows.Consider a binary vector of length n that is initially all zeros . You choose a bit of the vector and set it to 1 . Now a process starts that sets the bit that is the greatest distance from any 1 bit to $ 1 $ ( or an arbitrary choice of fu... | Fast way to place bits for puzzle |
Python : I have text in my database . I send some text from xhr to my view . Function find does not find some unicode chars.I want to find selected text using : but sometimes variable 'selection ' contains a char like that : whereas in variable 'text ' there was : They are just different forms of the same thing . How t... | Python the same char not equals |
Python : I 'm playing around with generators and generator expressions and I 'm not completely sure that I understand how they work ( some reference material ) : So it looks like generator.send was ignored . That makes sense ( I guess ) because there is no explicit yield expression to catch the sent information ... How... | Attempting to understand yield as an expression |
Python : I am trying to do the following with a sed script but it 's taking too much time . Looks like something I 'm doing wrongly.Scenario : I 've student records ( > 1 million ) in students.txt.In This file ( each line ) 1st 10 characters are student ID and next 10 characters are contact number and so onstudents.txt... | SED or AWK script to replace multiple text |
Python : For a data analysis task , I want to find zero crossings in a numpy array , coming from a convolution with first a sobel-like kernel , and then a mexican hat kernel . Zero crossings allow me to detect edges in the data.Unfortunately , the data is somewhat noisy and I only want to find zero crossings with a min... | Finding minimal jump zero crossings in numpy |
Python : Is there a method to print terminal formatted output to a variable ? I want that string ' b ' to a variable - so how to do it ? I am working with a text string from telnet . Thus I want to work with the string that would be printed to screen.So what I am looking for is something like this : Another example wit... | How to print terminal formatted output to a variable |
Python : Guided by this answer I started to build up pipe for processing columns of dataframe based on its dtype . But after getting some unexpected output and some debugging i ended up with test dataframe and test dtype checking : OUTPUT : Almost everything is good , but this test code produces two questions : The mos... | Caveats while checking dtype in pandas DataFrame |
Python : Why is the code below termed 'age-old disapproved method ' of printing in the comment by 'Snakes and Coffee ' to Blender 's post of Print multiple arguments in python ? Does it have to do with the backend code/implementation of Python 2 or Python 3 ? <code> print ( `` Total score for `` + str ( name ) + `` is ... | Why is print ( `` text '' + str ( var1 ) + `` more text '' + str ( var2 ) ) described as `` disapproved '' ? |
Python : Consider the following simple example class , which has a property that exposes a modified version of some internal data when called : The value.setter works fine for regular assignment , but of course breaks down for compound assignment : The desired behavior is that x.value += 5 should be equivalent to x.val... | Property setters for compound assignment ? |
Python : I have the following code : However , when I run python ./pypy/pypy/translator/goal/translate.py t.py I get the following error : There was actually more to the error but I thought only this last part was relevant . If you think more of it might be helpful , please comment and I will edit.In fact , I get anoth... | RPython sys methods do n't work |
Python : I 'm writing a passion program that will determine the best poker hand given hole cards and community cards . As an ace can go both ways in a straight , I 've coded this as [ 1 , 14 ] for a given 5 card combination.I understand recursion but implementing it is a different story for me . I 'm looking for a func... | Split list recursively until flat |
Python : I have a log file that is formatted in the following way : I am attempting to run some stats over this dataset . I have the following code : I did not want to define a class for such a simple dataset , so I used a name tuple . When I attempt to run , I get this error : It appears that the lambda function is op... | `` reduce '' function in python not work on `` namedtuple '' ? |
Python : When creating a BrowserView in Plone , I know that I may optionally configure a template with ZCML like so : Or alternatively in code : Is there any difference between the two approaches ? They both appear to yield the same result.Sub-question : I know there is a BrowserView class one can import , but conventi... | What is the difference between template in ZCML and ViewPageTemplateFile |
Python : Consider : I want to replace matches randomly with entries of a list repl . But when using lambda m : random.choice ( repl ) as a callback , it does n't replace \1 , \2 etc . with its captures any more , returning `` \1bla\2 '' as plain text.I 've tried to look up re.py on how they do it internally , so I migh... | How can I pass a callback to re.sub , but still inserting match captures ? |
Python : I have a web application with an associated API and database . I 'd like to use the same Django models in the API , but have it served separately by different processes so I can scale it independently . I also do n't need the API to serve static assets , or any of the other views . The complication is that the... | django deploying separate web & api endpoints on heroku |
Python : Is it possible to create hyperlinks without leading and trailing spaces ? The following does n't work : The reason I 'm asking is I 'm working with Chinese text . Spaces are not used as word delimiters in Chinese . With the added spaces the text does n't look well formatted , for example : 没有空格就对了。versus 多了 空格... | RestructuredText - Hyperlinks without leading and trailing spaces |
Python : I have a Python script that interfaces with an API . The script is started from a PHP page . I wrote both scripts , so I can change the code in either as appropriate.The Python script needs a username and password to interface with the API . My first inclination is to pass them to Python as CLI arguments : How... | Start process , hide arguments from ps |
Python : I 'm trying to pack and send columnar data over a socket connection . To speed it up , I thought about splitting the packing ( struct.pack ) to multiple processes . To avoid pickling both ways , I thought it might be better to have the packing processes send the data themselves , as it was said socket objects ... | Sending over the same socket with multiprocessing.pool.map |
Python : Perhaps I am doing something wrong while z-normalizing my array . Can someone take a look at this and suggest what 's going on ? In R : In Python using numpy : Am I using numpy incorrectly ? <code> > data < - c ( 2.02 , 2.33 , 2.99 , 6.85 , 9.20 , 8.80 , 7.50 , 6.00 , 5.85 , 3.85 , 4.85 , 3.85 , 2.22 , 1.45 , ... | Output values differ between R and Python ? |
Python : I see from here that I can pick out tests based on their mark like so : Let 's say I have a test decorated like so : I 'd like to do something like the following : That way I run test_Foo with the parameter of 'release ' but not the parameter of 'debug ' . Is there a way to do this ? I think I can do this by w... | Pytest select tests based on mark.parameterize value ? |
Python : I 'm running a Debian 10 stable x64 system with the dwm window manager , and I 'm using Python 3.7.3 . From what I can tell from some example code and the draw_text method itself , I should be able to draw text on the root window with code like this : This code runs without error , but no text is displayed . I... | How do I write text to the root window using Python 's Xlib ? |
Python : I wish to be able to perform python debugging using print ( ) or similar method where it prints the passed expression in addition to the usual output.For instance , for the following code : Current Output : Expected Output : Currently , the same can be achieved by manually adding the expression string , ( not ... | print ( ) method to print passed expression literally along with computed output for quick debugging |
Python : I 'm looking at an open source package ( MoviePy ) which adapts its functionality based on what packages are installed . For example , to resize an image , it will use the functionality provided by OpenCV , else PIL/pillow , else SciPy . If none are available , it will gracefully fallback to not support resizi... | Can I use Environment Markers in tests_require in setup.py ? |
Python : HighLine is a Ruby library for easing console input and output . It provides methods that lets you request input and validate it . Is there something that provides functionality similar to it in Python ? To show what HighLine does see the following example : It asks `` Yes or no ? `` and lets the user input so... | Is there a Python equivalent to HighLine ? |
Python : I want to replace those elements of list1 whose indices are stored in list indices by list2 elements . Following is the current code : Is it possible to write a one-liner for the above four lines using lambda function or list comprehension ? EDITlist1 contains float valueslist2 contains float valuesindices con... | Python one liner to substitute a list indices |
Python : How can I easily create an object that can not be pickled for testing edge cases in my rpc code ? It needs to be : SimpleReliable ( not expected to break in future versions of python or pickle ) Cross platformEdit : The intended use looks something like this : <code> class TestRPCServer : def foo ( self ) : re... | Create object that can not be pickled |
Python : I 've recently stumbled over this expression : It evaluates to False , but I do n't understand why.True == False is False and False in ( False , ) is True , so both ( to me ) plausible possibilitiesandevaluate to True , as I would have expected.What is going wrong here ? <code> True == False in ( False , ) Tru... | How does operator binding work in this Python example ? |
Python : Recently , reading Python `` Functional Programming HOWTO '' , I came across a mentioned there test_generators.py standard module , where I found the following generator : It took me a while to understand how it works . It uses a mutable list values to store the yielded results of the iterators , and the N+1 i... | Conjoin function made in functional style |
Python : As title , I creates the zip file from my Django backend server ( hosted on a Ubuntu 14.04.1 LTS ) using the python zipfile module : I managed to open it using my Mac in Finder , but no success using the SSZipArchive library . I have tried using the latest commit of master branch and also tag v1.0.1 and v0.4.0... | Unable to unzip a large zip file ( 3.3GB ) in iOS9 using SSZipArchive |
Python : When I train a SVC with cross validation , cross_val_predict returns one class prediction for each element in X , so that y_pred.shape = ( 1000 , ) when m=1000.This makes sense , since cv=5 and therefore the SVC was trained and validated 5 times on different parts of X . In each of the five validations , predi... | Why is cross_val_predict not appropriate for measuring the generalisation error ? |
Python : Is there a built-in function that works like zip ( ) , but fills the results so that the length of the resulting list is the length of the longest input and fills the list from the left with e.g . None ? There is already an answer using zip_longest from itertools module and the corresponding question is very s... | zip ( ) -like built-in function filling unequal lengths from left with None value |
Python : I 'm running Spark Streaming with two different windows ( on window for training a model with SKLearn and the other for predicting values based on that model ) and I 'm wondering how I can avoid one window ( the `` slow '' training window ) to train a model , without `` blocking '' the `` fast '' prediction wi... | How to avoid one Spark Streaming window blocking another window with both running some native Python code |
Python : Let 's say I want to create a list of ints using Python that consists of the cubes of the numbers 1 through 10 only if the cube is evenly divisible by four.I wrote this working line : My beef with this line of code is that it 's computing the cube of x twice . Is there more pythonic way to write this line ? Or... | Is this list comprehension pythonic enough ? |
Python : I am looking for a regex pattern that will match third , fourth , ... occurrence of each character . Look below for clarification : For example I have the following string : I want to replace all the duplicated characters after the second occurrence . The output will be : Some regex patterns that I tried so fa... | Match and remove duplicated characters : Replace multiple ( 3+ ) non-consecutive occurrences |
Python : I am using Django purely for creating template ( no server ) .Here is the scheme I have : page1.htmlbase.htmlcode_to_make_template.pyThe directory structure looks like this : But when I run code_to_make_template.py I got this message : What 's the right way to do it ? <code> { % extends `` base.html '' % } { %... | How to use Django templating as is without server |
Python : Here 's some data from another question : What I would do first is to add quotes across all words , and then : Is there a smarter way to do this ? <code> positive negative neutral1 [ marvel , moral , bold , destiny ] [ ] [ view , should ] 2 [ beautiful ] [ complicated , need ] [ ] 3 [ celebrate ] [ crippling ,... | How do you read in a dataframe with lists using pd.read_clipboard ? |
Python : I strace 'd a simple script using perl and bash.Why does perl need the pseudorandom number generator for such a trivial script ? I would expect opening /dev/urandom only after the first use of random data.Edit : I also tested python and rubyWhy do perl and ruby open it with different modes ? <code> $ strace pe... | why do perl , ruby use /dev/urandom |
Python : I have a list of dictionaries , and I need to get a list of the values from a given key from the dictionary ( all the dictionaries have those same key ) .For example , I have : I need to get 1 , 2 , 3.Of course , I can get it with : But I would like to get a nicer way to do so . <code> l = [ { `` key '' : 1 , ... | Get a list of values from a list of dictionaries ? |
Python : I know how to detect if my Python script 's stdout is being redirected ( > ) using sys.stdout.isatty ( ) but is there a way to discover what it 's being redirected to ? For example : Is there a way to discover the name somefile.txt on both Windows and Linux ? <code> python my.py > somefile.txt | Is there a way to find out the name of the file stdout is redirected to in Python |
Python : I have a dataset with ~300 points and 32 distinct labels and I want to evaluate a LinearSVR model by plotting its learning curve using grid search and LabelKFold validation.The code I have looks like this : My question is how to setup the cv attribute for the grid search and learning curve so that it will brea... | How to nest LabelKFold ? |
Python : Python 's print statement normally seems to print the repr ( ) of its input . Tuples do n't appear to be an exception : But then I stumbled across some strange behavior while messing around with CPython 's internals . In short : if you trick Python 2 into creating a self-referencing tuple , printing it directl... | What method does Python 2 use to print tuples ? |
Python : The following code : produces for numpy 1.13.3However , if I change the 127 to a 126 , both return a np.int8 array . And if I change the 127 to a 128 both return a np.int16 array.Questions : Is this expected behaviour ? Why is it different for the two platforms for this one case ? <code> > > > import numpy as ... | Multiplying a np.int8 array with 127 yields different numpy array types depending on platform |
Python : My goal is to have one cell in Jupyter notebook displaying multiple interactive widgets . Specifically , I would like to have four slider for cropping an image and then another separate slider for rotating this cropped image . Of course , both plots should be displayed when I run the code . Here is what I have... | How to include multiple interactive widgets in the same cell in Jupyter notebook |
Python : I am writing a python wrapper to the Microsoft Dynamics Business Connector .net assembly.This is my code : This is my errors when running pytest : .net decompiler shows : P.S . The stackoverflow grader asks me to add more details : ) What else - obj = clr.AddRefrence works and I can see a Microsoft attribute i... | Wrapping Microsoft Dynamics Business Connector .net assembly in python |
Python : I try to access the classmethod of a parent from within __init_subclass__ however that does n't seem to work.Suppose the following example code : which produces the following exception : The cls.__mro__ however shows that Foo is a part of it : ( < class '__main__.Bar ' > , < class '__main__.Foo ' > , < class '... | Using ` super ( ) ` within ` __init_subclass__ ` does n't find parent 's classmethod |
Python : I was a happy man , having his own happy local pip index . One day I 've updated pip client and I 'm not happy anymore : But WHY ? I have SSL enabled on my server and my pip.conf file looks like this : How is 'secure and verifiable'/'insecure and unverifiable ' file defined ? How PIP distinguishes between them... | In python PIP , how can I make files in my private pip index `` secure and verifiable '' ? |
Python : I have the following dataframe : I need to be able to keep track of when the latest maximum and minimum value occurred within a specific rolling window . For example if I were to use a rolling window period of 5 , then I would need an output like the following : All this shows is , what is the date of the late... | Most recent max/min value |
Python : I 've been boggling my head to make this array for some time but having no success doing it in a vectorized way.I need a function that takes in the 2d array size n and produces a 2d array of size ( n , n ) looking like this : ( and can take odd number arguments ) Any suggestions would be much appreciated , tha... | Build 2d pyramidal array - Python / NumPy |
Python : I 'm generating some pdfs using ReportLab in Django . I followed and experimented with the answer given to this question , and realised that the double-quotes therein do n't make sense : gives filename constant_-foo_bar-.pdfgives filename constant_foo_bar.pdfWhy is this ? Is it just to do with slug-esque sanit... | why are python double-quotes converted to hyphen in filename ? |
Python : Hi I get a strange error message : Property user is corrupt in the datastoreCan you tell me what it means and what I should do ? Here 's the full traceEDIT : Here is my entire model . I 've not changed it for several deployments : EDIT 2 : By changing the variable PAGESIZE I can make the page load for the most... | Property user is corrupt in the datastore : |
Python : I was searching for an algorithm to generate prime numbers . I found the following one done by Robert William Hanks . It is very efficient and better than the other algorithms but I can not understand the math behind it.What is the relation between the array of Trues values and the final prime numbers array ? ... | Prime numbers generator explanation ? |
Python : I know we can overload behavior of instances of a class , e.g . - We can change the result of print s : Can we change the result of print Sample ? <code> class Sample ( object ) : passs = Sample ( ) print s < __main__.Sample object at 0x026277D0 > print Sample < class '__main__.Sample ' > class Sample ( object... | Can we overload behavior of class object |
Python : I 've written a script in python to reach the target page where each category has their avaiable item names in a website . My below script can get the product names from most of the links ( generated through roving category links and then subcategory links ) .The script can parse sub-category links revealed up... | Trouble parsing product names out of some links with different depth |
Python : Let 's say you work with a wrapper object : This object implements __iter__ , because it passes any call to it to its member f , which implements it . Case in point : According to the documentation ( https : //docs.python.org/3/library/stdtypes.html # iterator-types ) , IterOrNotIter should thus be iterable.Ho... | How come an object that implements __iter__ is not recognized as iterable ? |
Python : Inspired by this earlier stack overflow question I have been considering how to randomly interleave iterables in python while preserving the order of elements within each iterable . For example : The original question asked to randomly interleave two lists , a and b , and the accepted solution was : However , ... | Interleaving multiple iterables randomly while preserving their order in python |
Python : I have a large array with 1024 entries that have 7 bit values in range ( 14 , 86 ) This means there are multiple range of indices that have the same value.For example , I want to feed this map to a python program that would spew out the following : Some code to groupby mapped value is ready but I am having dif... | Compressing a sinewave table |
Python : This question is a follow up to my answer in Efficient way to compute the Vandermonde matrix.Here 's the setup : Now , I 'll compute the Vandermonde matrix in two different ways : And , Sanity check : These methods are identical , but their performance is not : So , the first method , despite requiring a trans... | Broadcasted NumPy arithmetic - why is one method so much more performant ? |
Python : In Python 3I have n't considered corner cases ( exponent < = 0 ) Why do n't we use the above-written code in-place of code computed using Divide and Conquer Technique , this code looks more simple and easy to understand ? Is this code less efficient by any means ? <code> def power ( base , exponent ) : if expo... | Finding Power Using Recursion |
Python : This is a follow up to this answer to my previous question Fastest approach to read thousands of images into one big numpy array.In chapter 2.3 `` Memory allocation of the ndarray '' , Travis Oliphant writes the following regarding how indexes are accessed in memory for C-ordered numpy arrays . ... to move thr... | The accessing time of a numpy array is impacted much more by the last index compared to the second last |
Python : I want to maintain a Django model with a unique id for every combination of choices within the model . I would then like to be able to update the model with a new field and not have the previous unique id 's change . The id 's can be a hash or integer or anything.What 's the best way to achieve this ? Given th... | Using the Django ORM , How can you create a unique hash for all possible combinations |
Python : I 've been working on an R package which interfaces with Python via a simple server script and socket connections . I can test in on my own machine just fine , but I 'd like to test it on a Travis build as well ( I do n't want to go through the effort of setting up a Linux VM ) . To do this I would need a Pyth... | Installing both Python and R for a Travis build ? |
Python : I need to write a function that accepts a list of lists representing friends for each person and need to convert it into a dictionary . so an input of [ [ ' A ' , ' B ' ] , [ ' A ' , ' C ' ] , [ ' A ' , 'D ' ] , [ ' B ' , ' A ' ] , [ ' C ' , ' B ' ] , [ ' C ' , 'D ' ] , [ 'D ' , ' B ' ] , [ ' E ' ] ] should re... | Converting list of lists to a dictionary with multiple values for a key |
Python : I was looking at this and this threads , and though my question is not so different , it has a few differences . I have a dataframe full of floats , that I want to replace by strings . Say : To this table I want to replace by several criteria , but only the first replacement works : If I instead do the selecti... | Pandas : Selecting and modifying dataframe based on even more complex criteria |
Python : Above , I create a dict with a hash collision , and two slots occupied . How is that getitem handled for the integer 1 ? And how does the indexing manage to resolve the correct value for a complex literal indexing ? Python 2.7.12 / Linux . <code> > > > one_decimal = Decimal ( ' 1 ' ) > > > one_complex = comple... | Putting two keys with the same hash into a dict |
Python : Psychology experiments often require you to pseudo-randomize the trial order , so that the trials are apparently random , but you do n't get too many similar trials consecutively ( which could happen with a purely random ordering ) . Let 's say that the visual display on each trial has a colour and a size : An... | Sorting algorithm to keep equal values separated |
Python : I have some kind of verbose logic that I 'd like to compact down with some comprehensions.Essentially , I have a dict object that I 'm reading from which has 16 values in it that I 'm concerned with . I 'm getting the keys that I want with the following comprehension : The source dictionary kind of looks like ... | Combined list and dict comprehension |
Python : I 'm trying to make a basic Skype bot using Skype4Py and have encountered a rather serious error . I am working on a 64 bit windows 7 with the 32bit Python 2.7.8. installed , along with the latest version of Skype4Py.My main demand is that the bot has an overview of 5 different Skype chats : four individual ch... | Skype4Py MessageStatus not firing consistently |
Python : In a current benchmark about mongodb drivers , we have noticed a huge difference in performance between python and .Net ( core or framework ) .And the a part of the difference can be explained by this in my opinion.We obtained the following results : We took a look to the memory allocation in C # and we notice... | How to reach the same performance with the C # mongo driver than PyMongo in python ? |
Python : Given a function f ( ) , a number x and an integer N , I want to compute the List : An obvious way to do this in Python is the following Python code : But I want to know if there is a better or faster , way to do this . <code> y = [ x , f ( x ) , f ( f ( x ) ) , ... , f ( f ... M times ... f ( f ( x ) ) ] y = ... | Iterated function in Python |
Python : I have a script that consumes command line arguments and I would like to implement two argument-passing schemes , namely : Typing the arguments out at the command line.Storing the argument list in a file , and passing the name of this file to the program via the command line.To that end I am passing the argume... | How can I pass command line arguments contained in a file and retain the name of that file ? |
Python : Before Python-3.3 , I detected that a module was loaded by a custom loader with hasattr ( mod , '__loader__ ' ) .After Python-3.3 , all modules have the __loader__ attribute regardless of being loaded by a custom loader.Python-2.7 , 3.2 : Python-3.3 : How do I detect that a module was loaded by a custom loader... | Python - How do you detect that a module has been loaded by custom loader ? |
Python : Python has a nice feature that gives the contents of an object , like all of it 's methods and existing variables , called dir ( ) . However when dir is called in a function it only looks at the scope of the function . So then calling dir ( ) in a function has a different value than calling it outside of one .... | dir inside function |
Python : I have the following custom class : This class does exactly what i want for when i have multiple keys , but does n't do what i want for single keys.Let me demonstrate what my code outputs : But then : I want it to be : Here was my attempt to fix it to act the way i want ( which led to infinite recursion ) : <c... | Custom OrderedDict that returns itself |
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