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python Programming Glossary: e.gWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python attributes to it you can pass it as a function parameter e.g. print ObjectCreator # you can print a class because it's an.. be empty dictionary containing attributes names and values e.g. class MyShinyClass object ... pass can be created manually..
http://stackoverflow.com/questions/145270/calling-c-c-from-python foo.o And finally you have to write your python wrapper e.g. in fooWrapper.py from ctypes import cdll lib cdll.LoadLibrary..
http://stackoverflow.com/questions/15112125/if-x-or-y-or-z-blah or z would evaluate to the first argument that is 'truthy' e.g. not False numeric 0 or empty see boolean expressions for details..
In Python, how do I determine if an object is iterable? http://stackoverflow.com/questions/1952464/in-python-how-do-i-determine-if-an-object-is-iterable for __iter__ works on sequence types but it would fail on e.g. strings. I would like to know the right answer too until then..
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 anyone had a good solution to this for lists of any length e.g. using generators. This should work l range 1 1000 print chunks..
http://stackoverflow.com/questions/3455456/what-kinds-of-patterns-could-i-enforce-on-the-code-to-make-it-easier-to-translat of simply doing a manual conversion for small code bases e.g. up to about 100K SLOC in our experience the economics simply..
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 of results A number if the number is valid A status code e.g. via errno or exception to show that no valid number could be..
What does `if __name__ == “__main__”:` do? http://stackoverflow.com/questions/419163/what-does-if-name-main-do let's assume that it's executing as the main function e.g. you said something like python threading_example.py on the..
Redirect stdout to a file in Python? http://stackoverflow.com/questions/4675728/redirect-stdout-to-a-file-in-python at commenter's request When a long running Python script e.g web application is started from within the ssh session and backgounded..
Python string formatting: % vs. .format http://stackoverflow.com/questions/5082452/python-string-formatting-vs-format some debug info s some_info will first evaluate to e.g. some debug info roflcopters are active then that string will..
Django - Set Up A Scheduled Job? http://stackoverflow.com/questions/573618/django-set-up-a-scheduled-job is to do this 1 Create a custom management command e.g. python manage.py my_cool_command 2 Use cron on Linux or at..
Python __init__ and self what do they do? http://stackoverflow.com/questions/625083/python-init-and-self-what-do-they-do to the __init__ method. Any additional parameters e.g. A 24 'Hello' will also get passed as arguments in this case..
What's the difference between list and tuples in Python? http://stackoverflow.com/questions/626759/whats-the-difference-between-list-and-tuples-in-python of page and line number to reference locations in a book e.g. my_location 42 11 # page number line number You can then use.. tuple . There are some interesting articles on this issue e.g. Python Tuples are Not Just Constant Lists or Understanding..
What is the best way to implement nested dictionaries in Python? http://stackoverflow.com/questions/635483/what-is-the-best-way-to-implement-nested-dictionaries-in-python like aggregations and looking at subsets of the dictionary e.g. if I just want to go state by state . Basically sometimes I..
How to do relative imports in Python? http://stackoverflow.com/questions/72852/how-to-do-relative-imports-in-python the module's name does not contain any package information e.g. it is set to '__main__' then relative imports are resolved..
Exif manipulation library for python [closed] http://stackoverflow.com/questions/765396/exif-manipulation-library-for-python manipulation library for python. I prefer flexibility e.g. ability to retrieve providers' proprietary tags than processing..
Adding a Method to an Existing Object http://stackoverflow.com/questions/972/adding-a-method-to-an-existing-object that it is possible to add a method to an existing object e.g. not in the class definition in python I think this is called..
Trying to send email (Gmail as mail provider) using Python http://stackoverflow.com/questions/10147455/trying-to-send-email-gmail-as-mail-provider-using-python message body by a blank line and use CRLF as EOL markers. E.g. msg r n .join From user_me@gmail.com To user_you@gmail.com..
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 8 _single_leading_underscore weak internal use indicator. E.g. from M import does not import objects whose name starts with..
http://stackoverflow.com/questions/1319763/key-ordered-dict-in-python just keep a list of all keys on the side of a dict. E.g. class Crazy object def __init__ self self.d self.L self.sorted..
“Large data” work flows using pandas http://stackoverflow.com/questions/14262433/large-data-work-flows-using-pandas or just columns What will typical operations look like. E.g. do a query on columns to select a bunch of rows and specific.. they allow you to sub select rows based on the column. E.g. something like store.select group where 'field_1000 foo' 'field_1001..
Format floats with standard json module http://stackoverflow.com/questions/1447287/format-floats-with-standard-json-module a design defect in the standard library json package . E.g. this code import json from json import encoder encoder.FLOAT_REPR..
Python - Using the Multiply Operator to Create Copies of Objects in Lists http://stackoverflow.com/questions/1605024/python-using-the-multiply-operator-to-create-copies-of-objects-in-lists should I just stick with a list comprehension or something E.g. for x in range 0 3 Any version of Python is fine. python list..
Python regex matching Unicode properties http://stackoverflow.com/questions/1832893/python-regex-matching-unicode-properties Unicode properties such as the category in a regex. E.g. in Perl you can use p Ll to match an arbitrary lower case letter..
What exactly do “u” and “r”string flags in Python, and what are raw string litterals? http://stackoverflow.com/questions/2081640/what-exactly-do-u-and-rstring-flags-in-python-and-what-are-raw-string-litte might be expressed in is a completely orthogonal issue. E.g. consider Python 2.6 sys.getsizeof 'ciao' 28 sys.getsizeof u'ciao'..
http://stackoverflow.com/questions/2447353/getattr-on-a-module the class if you insist but that's generally less useful . E.g. # module foo.py import sys class Foo def funct1 self args code..
What are good uses for Python3's “Function Annotations” http://stackoverflow.com/questions/3038033/what-are-good-uses-for-python3s-function-annotations you call them that you should read their documentation E.g. imagine you have a method that must not be invoked with a negative..
http://stackoverflow.com/questions/3269686/short-rot13-function ''.join rot_char c for c in s Can anyone make it better E.g supporting uppercase characters. This is less a question rather..
How can I “watch” a file for modification / change? http://stackoverflow.com/questions/3274334/how-can-i-watch-a-file-for-modification-change improve this question As noted you can use pyinotify E.g. import webbrowser import pyinotify class ModHandler pyinotify.ProcessEvent..
python: urllib2 how to send cookie with urlopen request http://stackoverflow.com/questions/3334809/python-urllib2-how-to-send-cookie-with-urlopen-request open url and to send specific cookie text to the server. E.g. I want to open site Solve chess problems with a specific cookie..
http://stackoverflow.com/questions/4370745/view-onto-a-numpy-array this question Sure just index it as you normally would. E.g. y x k This will return a view into the original array. No data.. in memory Use etc to avoid making a copy of the array. E.g. x 10 will modify the array in place while x x 10 will make..
Execute code when Django starts ONCE only? http://stackoverflow.com/questions/6791911/execute-code-when-django-starts-once-only but the Hello message is output to the terminal twice . E.g. from django.core.exceptions import MiddlewareNotUsed from django.conf..
How do I copy a file to a remote server in python using scp or ssh? http://stackoverflow.com/questions/68335/how-do-i-copy-a-file-to-a-remote-server-in-python-using-scp-or-ssh
What does the Python Ellipsis object do? http://stackoverflow.com/questions/772124/what-does-the-python-ellipsis-object-do useful to be able to slice in multiple dimensions as well. E.g. given a 4x4 array the top left area would be defined by the..
http://stackoverflow.com/questions/972362/spawning-process-from-python Spawn a completely detached subprocess i.e. a daemon . E.g. for mark spawnDaemon .. bin producenotify.py producenotify.py..
Common pitfalls in Python [duplicate] http://stackoverflow.com/questions/1011431/common-pitfalls-in-python flexibility. Instead use duck typing by checking behavior. E.G you expect a string in a function then use str to convert any..
What is an ORM and where can I learn more about it? http://stackoverflow.com/questions/1279613/what-is-an-orm-and-where-can-i-learn-more-about-it use SQL anymore but directly an object of your language. E.G. a completely imaginary case with a pseudo language You have..
How to print date in a regular format in Python? http://stackoverflow.com/questions/311627/how-to-print-date-in-a-regular-format-in-python must print the date objects not their container the list . E.G you want to print all the date in a list for date in mylist.. pattern explaining how you want to format your date. E.G print today.strftime 'We are the d b Y' 'We are the 22 Nov 2008'..
Python join, why is it string.join(list) instead of list.join(string)? http://stackoverflow.com/questions/493819/python-join-why-is-it-string-joinlist-instead-of-list-joinstring lists but the result and the joiner are always strings. E.G import urllib2 print ' n############ n'.join urllib2.urlopen..
What are the operator methods for boolean 'and', 'or' in Python? [closed] http://stackoverflow.com/questions/5084615/what-are-the-operator-methods-for-boolean-and-or-in-python behavior of and or or because they can short circuit. E.G if variable or long_fonction_to_execute # do stuff If variable.. processing. But it means you cannot make it a function E.G if bor variable long_fonction_to_execute # do stuff In that..
http://stackoverflow.com/questions/7782721/java-raw-audio-output It is pretty simple to generate a sound in memory. E.G. The important part of generating the tone and storing it in..
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