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python Programming Glossary: tryWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python will look for a __metaclass__ in Bar the parent class and try to do the same. If Python can't find __metaclass__ in any parent.. it will look for a __metaclass__ at the MODULE level and try to do the same. Then if it can't find any __metaclass__ at all..
Differences between isinstance() and type() in python http://stackoverflow.com/questions/1549801/differences-between-isinstance-and-type-in-python preferred solution is almost invariably duck typing try using the argument as if it was of a certain desired type do.. argument as if it was of a certain desired type do it in a try except statement catching all exceptions that could arise if.. type nicely duck mimicking it and in the except clause try something else using the argument as if it was of some other..
Dynamic module import in Python http://stackoverflow.com/questions/301134/dynamic-module-import-in-python this is implemented something like command sys.argv 1 try command_module __import__ myapp.commands. s command fromlist..
http://stackoverflow.com/questions/3455456/what-kinds-of-patterns-could-i-enforce-on-the-code-to-make-it-easier-to-translat built into it most of which you won't discover until you try to wrestle it into doing something else. At that point you find.. your attempt to make it do something else. I suspect trying to get the Python AST to model PHP is going to be a lot of.. The hardest part of my job over the last 15 years is to try to prevent such assumptions from creeping in . Lots of folks..
Non-blocking read on a subprocess.PIPE in python http://stackoverflow.com/questions/375427/non-blocking-read-on-a-subprocess-pipe-in-python subprocess import PIPE Popen from threading import Thread try from Queue import Queue Empty except ImportError from queue.. # ... do other things here # read line without blocking try line q.get_nowait # or q.get timeout .1 except Empty print 'no..
How to improve performance of this code? http://stackoverflow.com/questions/4295799/how-to-improve-performance-of-this-code formation node formation 0 None closedlist while 1 try f current openlist.get except IndexError current None if current..
How to install pip on windows? http://stackoverflow.com/questions/4750806/how-to-install-pip-on-windows is an apt get like packaging system on windows you can try Martin Redola's answer below http stackoverflow.com a 15966898..
Python read a single character from the user http://stackoverflow.com/questions/510357/python-read-a-single-character-from-the-user input. Does not echo to the screen. def __init__ self try self.impl _GetchWindows except ImportError self.impl _GetchUnix.. fd sys.stdin.fileno old_settings termios.tcgetattr fd try tty.setraw sys.stdin.fileno ch sys.stdin.read 1 finally termios.tcsetattr..
Lazy Method for Reading Big File in Python? http://stackoverflow.com/questions/519633/lazy-method-for-reading-big-file-in-python Big File in Python I have a very big file 4GB and when I try to read it my computer hangs. So I want to read it piece by..
Simple Digit Recognition OCR in OpenCV-Python http://stackoverflow.com/questions/9413216/simple-digit-recognition-ocr-in-opencv-python Digit Recognition OCR in OpenCV Python I am trying to implement a Digit Recognition OCR in OpenCV Python cv2.. since all letters are of same font and size i decided to try on this . To prepare the data for training i made a small code..
Python: How do I pass a variable by reference? http://stackoverflow.com/questions/986006/python-how-do-i-pass-a-variable-by-reference Let's have some examples. List a mutable type Let's try to modify the list that was passed to a method def try_to_change_list_contents.. try to modify the list that was passed to a method def try_to_change_list_contents the_list print 'got' the_list the_list.append.. 'one' 'two' 'three' print 'before outer_list ' outer_list try_to_change_list_contents outer_list print 'after outer_list '..
How to make the python interpreter correctly handle non-ASCII characters in string operations? http://stackoverflow.com/questions/1342000/how-to-make-the-python-interpreter-correctly-handle-non-ascii-characters-in-stri well. BeautifulSoup might not be returning unicode here. Try s s.decode 'utf 8' string.replace returns a new string and does..
Is it feasible to compile Python to machine code? http://stackoverflow.com/questions/138521/is-it-feasible-to-compile-python-to-machine-code c linker compilation share improve this question Try ShedSkin Python to C compiler but it is far from perfect. Also..
Python: Get list of all classes within current module http://stackoverflow.com/questions/1796180/python-get-list-of-all-classes-within-current-module python reflection inspect share improve this question Try this import sys current_module sys.modules __name__ In your..
BeautifulSoup Grab Visible Webpage Text http://stackoverflow.com/questions/1936466/beautifulsoup-grab-visible-webpage-text html content extraction share improve this question Try this html urllib.urlopen 'http www.nytimes.com 2009 12 21 us..
Simple Python Challenge: Fastest Bitwise XOR on Data Buffers http://stackoverflow.com/questions/2119761/simple-python-challenge-fastest-bitwise-xor-on-data-buffers performance xor share improve this question First Try Using scipy.weave and SSE2 intrinsics gives a marginal improvement... arr_size headers ' emmintrin.h ' return b.tostring Second Try Taking into account the comments I revisited the code to find..
when does Python allocate new memory for identical strings? http://stackoverflow.com/questions/2123925/when-does-python-allocate-new-memory-for-identical-strings memory id a id b or may be in memory twice id a id b . Try ab ab print id ab id a b Here Python recognizes that the newly..
Python module for converting PDF to text http://stackoverflow.com/questions/25665/python-module-for-converting-pdf-to-text extraction pdf scraping share improve this question Try PDFMiner. It can extract text from PDF files as HTML SGML or..
Create directory if it doesn't exist for file write http://stackoverflow.com/questions/273192/create-directory-if-it-doesnt-exist-for-file-write each with a small flaw so I'll give my take on it Try os.path.exists and consider os.makedirs for the creation. if..
Is there a php function like python's zip? http://stackoverflow.com/questions/2815162/is-there-a-php-function-like-pythons-zip PHP equivalent php python share improve this question Try this function to create an array of arrays similar to Python..
How can I open an Excel file in Python? http://stackoverflow.com/questions/3239207/how-can-i-open-an-excel-file-in-python Excel file python excel share improve this question Try the xlrd library . Edit from what I can see from your comment..
How do I check if a string is a number in Python? http://stackoverflow.com/questions/354038/how-do-i-check-if-a-string-is-a-number-in-python faster than the above. It calls the function and returns. Try Catch doesn't introduce much overhead because the most common..
python equivalent of filter() getting two output lists (i.e. partition of a list) http://stackoverflow.com/questions/4578590/python-equivalent-of-filter-getting-two-output-lists-i-e-partition-of-a-list filter data partitioning share improve this question Try this def partition pred iterable trues falses for item in iterable..
How to install pip on windows? http://stackoverflow.com/questions/4750806/how-to-install-pip-on-windows . Now you should be able to run pip from the command line. Try installing a package pip install httpie There you go hopefully..
In Python, how do I read the exif data for an image? http://stackoverflow.com/questions/4764932/in-python-how-do-i-read-the-exif-data-for-an-image python imaging library share improve this question Try this from PIL import Image img Image.open 'img.jpg' exif_data..
IndentationError: unindent does not match any outer indentation level http://stackoverflow.com/questions/492387/indentationerror-unindent-does-not-match-any-outer-indentation-level correct...there might be spaces mixed in with your tabs. Try doing a search replace to replace all tabs with a few spaces... a search replace to replace all tabs with a few spaces. Try this import sys def Factorial n # return factorial result 1..
How to write the Fibonacci Sequence in Python http://stackoverflow.com/questions/494594/how-to-write-the-fibonacci-sequence-in-python if n 0 return 0 elif n 1 return 1 else return F n 1 F n 2 Try it in your favourite language and see this form requires a lot..
How to know if an object has an attribute in Python http://stackoverflow.com/questions/610883/how-to-know-if-an-object-has-an-attribute-in-python it python attributes share improve this question Try hasattr if hasattr a 'property' a.property EDIT See zweiterlinde's..
http://stackoverflow.com/questions/70797/python-and-user-input text from the user . Command line inputs are in sys.argv. Try this in your script import sys print sys.argv There are two..
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