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python Programming Glossary: evenWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python cls clsname bases uppercase_attr We can make it even cleaner by using super which will ease inheritance because yes.. from metaclass override parent methods. Metaclasses can even use metaclasses. You can structure your code better. You never.. an IntegerField object. It will return an int and can even take it directly from the database. This is possible because..
The meaning of a single- and a double-underscore before an object name in Python http://stackoverflow.com/questions/1301346/the-meaning-of-a-single-and-a-double-underscore-before-an-object-name-in-python class variables methods variables stored in globals and even variables stored in instances. private to this class on instances..
http://stackoverflow.com/questions/15112125/if-x-or-y-or-z-blah than the test so the latter is evaluated first . However even if this were not the case and the expression x or y or z 1 was..
Fastest way to list all primes below N in python http://stackoverflow.com/questions/2068372/fastest-way-to-list-all-primes-below-n-in-python get_primes' .timeit 1 1.1499958793645562 Can it be made even faster EDIT This code has a flaw Since numbers is an unordered..
Flatten (an irregular) list of lists in Python http://stackoverflow.com/questions/2158395/flatten-an-irregular-list-of-lists-in-python 3 4 5 6 Where the desired output is 1 2 3 4 5 6 Or perhaps even better an iterator. The only solution I saw that works for an..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained It's a concise way to go through all these nested data even if it's a bit dangerous since you can end up with an infinite.. wall_street_atm hsbc.create_atm # it's even true for new ATMs print wall_street_atm.next type 'exceptions.StopIteration'.. 'exceptions.StopIteration' hsbc.crisis False # trouble is even post crisis the ATM remains empty print corner_street_atm.next..
http://stackoverflow.com/questions/261638/how-do-i-protect-python-code restricted license file. If we distribute the .py files or even .pyc files it will be easy to decompile and remove the code..
Import a module from a relative path http://stackoverflow.com/questions/279237/import-a-module-from-a-relative-path import os sys inspect # realpath with make your script run even if you symlink it cmd_folder os.path.realpath os.path.abspath..
http://stackoverflow.com/questions/3455456/what-kinds-of-patterns-could-i-enforce-on-the-code-to-make-it-easier-to-translat part of my job over the last 15 years is to try to prevent such assumptions from creeping in . Lots of folks also make.. insist on translating million line systems by hand that's even harder and they normally find out painfully with long time delays.. takes a lot of energy to build a working robust translator even with good tools. While it seems sexy and cool to build a translator..
Converting string into datetime http://stackoverflow.com/questions/466345/converting-string-into-datetime I need to magic them into real datetime objects. Any help even if it's just a kick in the right direction would be appreciated...
How can you profile a Python script? http://stackoverflow.com/questions/582336/how-can-you-profile-a-python-script running a script python m cProfile myscript.py To make it even easier I made a little batch file called 'profile.bat' python..
Python: How do I pass a variable by reference? http://stackoverflow.com/questions/986006/python-how-do-i-pass-a-variable-by-reference you still can't rebind the outer reference and you can't even mutate the object. Okay this is a little confusing. Let's have..
What is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python print FooChild.bar # bar is inherited from Foo True Eventually you'll want to add methods to your class. Just define.. and __call__ . Which will allow you to do different stuff. Even if usually you can do it all in __new__ some people are just..
What does python sys.intern do, and when should it be used? http://stackoverflow.com/questions/1136826/what-does-python-sys-intern-do-and-when-should-it-be-used quiche' In the above example a holds the interned string. Even though it is not visible the sys.intern function has saved the.. dream of quiche' b 'why do pangolins dream of quiche' Even though it is not immediately visible because the string 'why..
http://stackoverflow.com/questions/1151658/python-hashable-dicts is that python dicts cannot appear as keys to other dicts. Even using a tuple as I'd be doing anyways doesn't help. cache rule..
http://stackoverflow.com/questions/1190206/threading-in-python fine control over priority over what executes when. Cons Even with a good library asynchronous programming is usually harder..
How to execute Python scripts in Windows? http://stackoverflow.com/questions/1934675/how-to-execute-python-scripts-in-windows to help them with good answers. Brought In From Comments Even if assoc and ftype display the correct information it may happen.. 57 @parvus Your comment was the ultimate solution for me. Even with the associations reading correctly these two keys were..
MySQL “incorrect string value” error when save unicode string in Django http://stackoverflow.com/questions/2108824/mysql-incorrect-string-value-error-when-save-unicode-string-in-django resolved it by changing the character set of the column. Even though your database has a default character set of utf 8 I..
Displaying webcam feed using opencv and python http://stackoverflow.com/questions/2601194/displaying-webcam-feed-using-opencv-and-python method. This waits for 10 ms for the user to enter a key. Even if you're not using the key at all put this in. I think there..
http://stackoverflow.com/questions/261638/how-do-i-protect-python-code interpreted language is very difficult to lock down. Even if you use a exe packager like py2exe the layout of the executable..
Inverse Distance Weighted (IDW) Interpolation with Python http://stackoverflow.com/questions/3104781/inverse-distance-weighted-idw-interpolation-with-python by running RPy2 based analysis in a separate process. Even if this issue is resolved in a recent future release and efficiency.. is a way to efficiently mask out only the points I need. Even with this modification I wouldn't expect performance to be all..
Print in one line dynamically. Python http://stackoverflow.com/questions/3249524/print-in-one-line-dynamically-python 3 4 . . . How get this to instead look like 1 2 3 4 5 ... Even better is it possible to print the single number over the last..
How to bind self events in Tkinter Text widget after it will binded by Text widget? http://stackoverflow.com/questions/3501849/how-to-bind-self-events-in-tkinter-text-widget-after-it-will-binded-by-text-widg asked how to change the order that is what I will address. Even though a binding appears to be associated with a widget when..
Python/Tkinter: Interactively validating Entry widget content http://stackoverflow.com/questions/4140437/python-tkinter-interactively-validating-entry-widget-content world but quite sufficiently documented in the Tk world . Even though it's not documented well it has everything you need to..
Making moves w/ websockets and python / django ( / twisted? ) http://stackoverflow.com/questions/4363899/making-moves-w-websockets-and-python-django-twisted of whats going on. Sorry for going into great detail. Even if most of the answer isn't specific to your question it might.. Since then I would suggest using something like eventlet . Eventlet has a working websocket implementation I borrowed some code..
How can you profile a Python script? http://stackoverflow.com/questions/582336/how-can-you-profile-a-python-script interpreter like this import cProfile cProfile.run 'foo ' Even more usefully you can invoke the cProfile when running a script..
Creating a singleton in python http://stackoverflow.com/questions/6760685/creating-a-singleton-in-python here flows one way From your application into the logger. Even thought loggers are global state since no information flows..
http://stackoverflow.com/questions/9001509/python-dictionary-sort-by-key question Standard Python dictionaries are unordered. Even if you sorted the key value pairs you wouldn't be able to store..
Reading a UTF8 CSV file with Python http://stackoverflow.com/questions/904041/reading-a-utf8-csv-file-with-python de 10 Mpx de Canon avec trépied SD1200IS Vert ... Even though I try to encode decode to UTF 8 I am still getting the..
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