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python Programming Glossary: doWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python but this one is tricky. I know it has something to do with introspection but it's still unclear to me. So what are.. but it's still unclear to me. So what are metaclasses What do you use them for Concrete examples including snippets much appreciated.. But as with most things in Python it gives you a way to do it manually. Remember the function type The good old function..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained What is the use of the yield keyword in Python What does it do For example I'm trying to understand this code def node._get_child_candidates.. is the use of the yield keyword in Python What does it do For example I'm trying to understand this code def node._get_child_candidates.. is returned Is it called again When subsequent calls do stop The code comes from Jochen Schulz jrschulz who made a great..
How do you split a list into evenly sized chunks in Python? http://stackoverflow.com/questions/312443/how-do-you-split-a-list-into-evenly-sized-chunks-in-python do you split a list into evenly sized chunks in Python I have.. chunks and operate on it. There are some obvious ways to do this like keeping a counter and two lists and when the second..
Common pitfalls in Python [duplicate] http://stackoverflow.com/questions/1011431/common-pitfalls-in-python y import x and import x are treated as different modules . Do not use range in place of lists because range will become an.. print TypeError python share improve this question Don't use index to loop over a sequence Don't for i in range len.. this question Don't use index to loop over a sequence Don't for i in range len tab print tab i Do for elem in tab print..
http://stackoverflow.com/questions/1035340/reading-binary-file-in-python f open myfile rb try byte f.read 1 while byte # Do stuff with byte. byte f.read 1 finally f.close By suggestion.. with open myfile rb as f byte f.read 1 while byte # Do stuff with byte. byte f.read 1 Note that the with statement.. with open myfile rb as f byte f.read 1 while byte b # Do stuff with byte. byte f.read 1 Or as benhoyt says skip the not..
Using numpy to build an array of all combinations of two arrays http://stackoverflow.com/questions/1208118/using-numpy-to-build-an-array-of-all-combinations-of-two-arrays more then 15 seconds just to create the array 'values'. Do you know any more efficient way of doing this with numpy I can..
Python thread pool similar to the multiprocessing Pool? http://stackoverflow.com/questions/3033952/python-thread-pool-similar-to-the-multiprocessing-pool will release the GIL before the actual function call. Do I have to write my own threading pool python multithreading..
Using global variables in a function other than the one that created them http://stackoverflow.com/questions/423379/using-global-variables-in-a-function-other-than-the-one-that-created-them function how can I use that variable in another function Do I need to store the global variable in a local variable of the..
How do I unload (reload) a Python module? http://stackoverflow.com/questions/437589/how-do-i-unload-reload-a-python-module using the reload builtin function import foo while True # Do some things. if is_changed foo foo reload foo I think that this..
http://stackoverflow.com/questions/509211/pythons-slice-notation slice notation Do you have a good reference on Python's slice notation To me this..
What is the best way to remove accents in a python unicode string? http://stackoverflow.com/questions/517923/what-is-the-best-way-to-remove-accents-in-a-python-unicode-string all the characters whose unicode type is diacritic . Do I need to install a library such as pyICU or is this possible..
How do you validate a URL with a regular expression in Python? http://stackoverflow.com/questions/827557/how-do-you-validate-a-url-with-a-regular-expression-in-python at the pieces to see if they're displeasing in some way. Do you want the scheme to always be http Do you want the netloc.. in some way. Do you want the scheme to always be http Do you want the netloc to always be www.somename.somedomain Do.. you want the netloc to always be www.somename.somedomain Do you want the path to look unix like Or windows like Do you want..
How do I check if a variable exists in Python? http://stackoverflow.com/questions/843277/how-do-i-check-if-a-variable-exists-in-python I'm doing something like this try myVar except NameError # Do something. Are there other ways without exceptions python exception..
How to get line count cheaply in Python? http://stackoverflow.com/questions/845058/how-to-get-line-count-cheaply-in-python figure out how many n you have and return that result. Do you have a better way of doing that without reading the entire..
Tell me why this does not end up with a timeout error (selenium 2 webdriver)? http://stackoverflow.com/questions/10757061/tell-me-why-this-does-not-end-up-with-a-timeout-error-selenium-2-webdriver a page to load up because of a bad proxy and you obviously DO NOT want to wait that long what you want is a timeout exception...
Creating dynamically named variables from user input http://stackoverflow.com/questions/11354214/creating-dynamically-named-variables-from-user-input
Source interface with Python and urllib2 http://stackoverflow.com/questions/1150332/source-interface-with-python-and-urllib2 course run it at need just for those outgoing sockets you DO need to bind in a certain way then each time restore socket.socket..
How can I perform a ping or traceroute using native python? http://stackoverflow.com/questions/1151771/how-can-i-perform-a-ping-or-traceroute-using-native-python often frowned upon on security grounds and of course you DO need to have root permission to access the raw socked as needed..
sqlalchemy cursor error during yield_per http://stackoverflow.com/questions/12233115/sqlalchemy-cursor-error-during-yield-per engine session scoped_session sessionmaker_ def foo item # DO something to the item session.add item session.commit def main..
How expensive are Python dictionaries to handle? http://stackoverflow.com/questions/1418588/how-expensive-are-python-dictionaries-to-handle for those exceedingly rare situations where nanoseconds DO matter but easy enough to do that it's no big hardship to check..
How can I port a legacy Java/J2EE website to a modern scripting language (PHP,Python/Django, etc)? http://stackoverflow.com/questions/199556/how-can-i-port-a-legacy-java-j2ee-website-to-a-modern-scripting-language-php-py simple possibly tangentially related to your main project. DO NOT build a piece of the final project and hope it will evolve.. those pieces from most important to least important. DO NOT plan the entire conversion as one massive project. It never..
http://stackoverflow.com/questions/241575/framework-cms-suggestions-for-enterprise-website-intranet-ive-got-to-convinc mean it requires an enterprise class tool. But those that DO have enterprise class requirements ARE complicated because the..
Import a module from a relative path http://stackoverflow.com/questions/279237/import-a-module-from-a-relative-path # cmd_folder os.path.dirname os.path.abspath __file__ # DO NOT USE __file__ # __file__ fails if script is called in different..
How do I learn algorithms? [closed] http://stackoverflow.com/questions/3026813/how-do-i-learn-algorithms could have asked in the beginning..... WHERE IN THE WORLD DO I START Ive been trying to find out how to understand some of..
compiling vim with python support http://stackoverflow.com/questions/3373914/compiling-vim-with-python-support link.sh Trying to remove the Xt library... link.sh We DO need the Xt library. link.sh Trying to remove the Xpm library.....
how to replace (update) text in a file line by line http://stackoverflow.com/questions/4778697/how-to-replace-update-text-in-a-file-line-by-line line testing it then writing if it needs to be updated. I DO NOT want to save as a new file as my script already backs up..
Mapping a global variable from a shared library with ctypes http://stackoverflow.com/questions/544173/mapping-a-global-variable-from-a-shared-library-with-ctypes files. Objdump shows the symbol as 00000000001294f8 g DO .bss 0000000000000004 Base pbs_errno python ctypes share..
http://stackoverflow.com/questions/5520918/python-irc-bot-question define hi print hi mynick hi bot hi MY QUESTION IS HOW TO DO THIS python irc bots share improve this question If you're..
http://stackoverflow.com/questions/6169522/no-module-named-zlib I received no module named zlib. jwxie518@jwxie518 P5E VM DO ~ virtualenv p python2.7 no site packages testenv Running virtualenv.. to install the missing module s . jwxie518@jwxie518 P5E VM DO ~ virtualenv p python3.2 testenv Running virtualenv with interpreter.. pip...............done. jwxie518@jwxie518 P5E VM DO ~ virtualenv p python3.2 no site packages testenv Running virtualenv..
Trapping MySQL Warnings In Python http://stackoverflow.com/questions/647805/trapping-mysql-warnings-in-python DATABASE IF EXISTS database_of_armaments' except WHAT DO I PUT HERE print 'There was a MySQL warning.' AND what goes..
How can I speed up update/replace operations in PostgreSQL? http://stackoverflow.com/questions/962361/how-can-i-speed-up-update-replace-operations-in-postgresql TO item WHERE EXISTS SELECT 1 FROM item WHERE key NEW.key DO INSTEAD UPDATE item SET a0 NEW.a0 a1 NEW.a1 a2 NEW.a2 WHERE..
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