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python Programming Glossary: beWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python most languages classes are just pieces of code that describe how to produce an object. That's kinda true in Python too class.. parameter e.g. print ObjectCreator # you can print a class because it's an object class '__main__.ObjectCreator' def echo.. whole class yourself. Since classes are objects they must be generated by something. When you use the class keyword Python..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained yield does you must understand what generators are. And before generators come iterables. Iterables When you create a list.. iterable lists strings files... These iterables are handy because you can read them as much as you wish but you store all.. iterators but you can only iterate over them once . It's because they do not store all the values in memory they generate..
http://stackoverflow.com/questions/509211/pythons-slice-notation start through the rest of the array a end # items from the beginning through end 1 a # a copy of the whole array There is.. of the whole array There is also the step value which can be used with any of the above a start end step # start through.. # start through not past end by step The key point to remember is that the end value represents the first value that is not..
Making a flat list out of list of lists in Python [duplicate] http://stackoverflow.com/questions/952914/making-a-flat-list-out-of-list-of-lists-in-python of lists in Python. I can do that in a for loop but maybe there is some cool one liner I tried it with reduce but I get.. ' item for sublist in l for item in sublist ' 10000 loops best of 3 143 usec per loop python mtimeit s'l 1 2 3 4 5 6 7 8.. mtimeit s'l 1 2 3 4 5 6 7 8 9 99' 'sum l ' 1000 loops best of 3 969 usec per loop python mtimeit s'l 1 2 3 4 5 6 7 8..
Common pitfalls in Python [duplicate] http://stackoverflow.com/questions/1011431/common-pitfalls-in-python can be mistakenly done with xrange myIndexList xrange 3 Be careful catching multiple exception types try raise KeyError.. and the element. for i elem in enumerate tab print i elem Be careful when using to check against True or False if var True..
pyserial - How to read the last line sent from a serial device http://stackoverflow.com/questions/1093598/pyserial-how-to-read-the-last-line-sent-from-a-serial-device edited for clarity and with a mention to readlines Be careful when using readline . Do specify a timeout when opening..
Processing single file from multiple processes in python http://stackoverflow.com/questions/11196367/processing-single-file-from-multiple-processes-in-python Map blocks and returns the entire result when its done. Be aware that in overly simple example the map is going to consume..
How to enumerate an object's properties in Python? http://stackoverflow.com/questions/1251692/how-to-enumerate-an-objects-properties-in-python value in vars theObject .iteritems print property value Be aware that in some rare cases there's a __slots__ property such..
PyLint, PyChecker or PyFlakes? [closed] http://stackoverflow.com/questions/1428872/pylint-pychecker-or-pyflakes than 3 letters. I will change that. Very very talkative. Be ready to use your eyes. Corrected script with lazy doc strings..
Python Twitter library: which one? [closed] http://stackoverflow.com/questions/3577399/python-twitter-library-which-one API Streaming API. My requirements are fairly simple Be able to use OAuth Be able to follow a user Be able to send a.. My requirements are fairly simple Be able to use OAuth Be able to follow a user Be able to send a direct message Be able.. simple Be able to use OAuth Be able to follow a user Be able to send a direct message Be able to post Streaming API..
http://stackoverflow.com/questions/394039/which-python-gui-framework use. I have 2 requirements Have buttons tabs and a textbox Be able to load an image in memory from the web I am using pyCURL..
How to implement “autoincrement” on Google AppEngine http://stackoverflow.com/questions/3985812/how-to-implement-autoincrement-on-google-appengine label something in a strong monotone increasing fashion. Be it Invoice Numbers shipping label numbers or the like. A number..
http://stackoverflow.com/questions/4370745/view-onto-a-numpy-array as the new type while x.view dtype will return a view. Be careful with this however... It's extremely powerful and useful..
pip install mysql-python fails with EnvironmentError: mysql_config not found http://stackoverflow.com/questions/5178292/pip-install-mysql-python-fails-with-environmenterror-mysql-config-not-found missing on your system or the installer could not find it. Be sure mysql_config is really installed. For example on debian..
http://stackoverflow.com/questions/541329/is-it-possible-to-programmatically-construct-a-python-stack-frame-and-start-exec distribution is constructing stack frames programtically. Be warned though it relies on undocumented and private APIs. http..
Python regular expression matching a multiline block of text http://stackoverflow.com/questions/587345/python-regular-expression-matching-a-multiline-block-of-text and matches the position immediately preceding a newline. Be aware too that a newline can consist of a linefeed n a carriage..
Howto get all methods of a python class with given decorator http://stackoverflow.com/questions/5910703/howto-get-all-methods-of-a-python-class-with-given-decorator at runtime manually via a metaclass etc. or inherited. Be aware that you can also decorate a class so if you enlighten..
how to pip uninstall with virtualenv on heroku cedar stack? http://stackoverflow.com/questions/8937905/how-to-pip-uninstall-with-virtualenv-on-heroku-cedar-stack stated on Github and in the Heroku's devcenter reference . Be aware that Heroku currently only endorses and supports the use..
How to use variables in SQL statement in Python? http://stackoverflow.com/questions/902408/how-to-use-variables-in-sql-statement-in-python API does proper escaping and quoting of variables. Be careful not to use the string formatting operator because it..
Optimizing performance of Postgresql database writes in Django? http://stackoverflow.com/questions/9423539/optimizing-performance-of-postgresql-database-writes-in-django can so the temp table does not have to be written to disk. Be aware that this has to be done before accessing any temporary..
http://stackoverflow.com/questions/13893287/python-time-limit DISCOVER THAT WE ARE PAST OUR DEADLINE. THE TASK NEEDS TO BE INTERRUPTED IN PROGRESS AS SOON AS THE TIME ELAPSES. max_time..
Picklable data containers that are dumpable in the current namespace http://stackoverflow.com/questions/14716727/picklable-data-containers-that-are-dumpable-in-the-current-namespace good reason why this code is ugly mainly YOU SHOULDN'T BE DOING SOMETHING LIKE THIS P and when using exec the usual warnings..
How to write a web proxy in Python http://stackoverflow.com/questions/16524545/how-to-write-a-web-proxy-in-python right 8px background image url ' Portals _default Skins BE images top_img.gif' height 200px width 427px background repeat..
How do I learn algorithms? [closed] http://stackoverflow.com/questions/3026813/how-do-i-learn-algorithms not put aside the challenge until its complete WHICH CAN BE EXTREMELY DRAINING ive tried most problems without cheating..
http://stackoverflow.com/questions/3049068/help-with-pyhook-error event if event.Alt 32 and event.KeyID 49 print 'HERE WILL BE THE CODE' hm.KeyDown OnKeyboardEvent hm.HookKeyboard pythoncom.PumpMessages.. event if event.Alt 32 and event.KeyID 49 print 'HERE WILL BE THE CODE' # return True to pass the event to other handlers..
Encoding error in Python with Chinese characters http://stackoverflow.com/questions/3883573/encoding-error-in-python-with-chinese-characters I am aware of GB18030 UTF 7 UTF 8 UTF 16 UTF 32 LE BE . Also for good measure GBK and GB3212 though these should be..
How to implement “autoincrement” on Google AppEngine http://stackoverflow.com/questions/3985812/how-to-implement-autoincrement-on-google-appengine shipping label numbers or the like. A number MUST NOT BE used twice Every number SHOULD BE used when exactly all smaller.. like. A number MUST NOT BE used twice Every number SHOULD BE used when exactly all smaller numbers have been used no holes..
Creating a logging handler to connect to Oracle? http://stackoverflow.com/questions/935930/creating-a-logging-handler-to-connect-to-oracle AND FITNESS. IN NO EVENT SHALL # VINAY SAJIP BE LIABLE FOR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES OR..
Why is reading lines from stdin much slower in C++ than Python? http://stackoverflow.com/questions/9371238/why-is-reading-lines-from-stdin-much-slower-in-c-than-python learned that scanf and gets are both UNSAFE and should NOT BE USED due to potential of buffer overflow. So I wrote this iteration..
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