python Programming Glossary: considerPython List Comprehension Vs. Map http://stackoverflow.com/questions/1247486/python-list-comprehension-vs-map or vice versa Is one generally more effecient or generally considered more pythonic than the other python map list comprehension.. may be faster in other cases and most not all pythonistas consider them more direct and clearer. An example of the tiny speed advantage..
Convert Python dict to object? http://stackoverflow.com/questions/1305532/convert-python-dict-to-object improve this question Update In Python 2.6 and onwards consider whether the namedtuple data structure suits your needs from..
http://stackoverflow.com/questions/1396668/python-get-object-by-id share improve this question You'll probably want to consider implementing it another way. Are you aware of the weakref module..
How do I ensure that re.findall() stops at the right place? http://stackoverflow.com/questions/17765805/how-do-i-ensure-that-re-findall-stops-at-the-right-place ' s .group 1 'aaa' If you wanted all tags then you should consider changing it to be non greedy ie . print re.findall r' title.. r' title . title ' s # 'aaa' 'aaa2' 'aaa3' But really consider using BeautifulSoup or lxml or similar to parse HTML. share..
Can't pickle <type 'instancemethod'> when using python's multiprocessing Pool.map() http://stackoverflow.com/questions/1816958/cant-pickle-type-instancemethod-when-using-pythons-multiprocessing-pool-ma methods are not picklable. The workaround whether you consider it easy or not is to add the infrastructure to your program..
Why is numpy's einsum faster than numpy's built in functions? http://stackoverflow.com/questions/18365073/why-is-numpys-einsum-faster-than-numpys-built-in-functions input and using an appropriate accumulator. For example consider the following In 1 x 255 np.ones 100 dtype np.uint8 In 2 x Out..
How can I quantify difference between two images? http://stackoverflow.com/questions/189943/how-can-i-quantify-difference-between-two-images for exposure difference this may be unnecessary # consider disabling it img1 normalize img1 img2 normalize img2 # calculate..
Python: Difference between class and instance attributes http://stackoverflow.com/questions/207000/python-difference-between-class-and-instance-attributes for the two styles When you read the code do you consider the meaning of the two styles to be significantly different.. share improve this question Beyond performance considerations there is a significant semantic difference. In the class..
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 be expressed in is a completely orthogonal issue. E.g. consider Python 2.6 sys.getsizeof 'ciao' 28 sys.getsizeof u'ciao' 34..
Create directory if it doesn't exist for file write http://stackoverflow.com/questions/273192/create-directory-if-it-doesnt-exist-for-file-write flaw so I'll give my take on it Try os.path.exists and consider os.makedirs for the creation. if not os.path.exists directory..
Is there a simple, elegant way to define Singletons in Python? [closed] http://stackoverflow.com/questions/31875/is-there-a-simple-elegant-way-to-define-singletons-in-python
Python: Why is functools.partial necessary? http://stackoverflow.com/questions/3252228/python-why-is-functools-partial-necessary dearly hope that even the most ardent lambda lover doesn't consider this horror more readable than the partial call . And the attribute..
http://stackoverflow.com/questions/3455456/what-kinds-of-patterns-could-i-enforce-on-the-code-to-make-it-easier-to-translat the manual part of the translation activity. Another key consideration is size of code to be translated. It takes a lot of energy.. biting the bullet and doing it. And yes that's painful. I consider our tools to be extremely good but then I'm pretty biased ...
Flattening a shallow list in Python http://stackoverflow.com/questions/406121/flattening-a-shallow-list-in-python a list comprehension or failing that what would you all consider to be the best way to flatten a shallow list like this balancing.. of the data structure and don't need an indexable sequence consider itertools.chain and company . list_of_menuitems 'image00' 'image01'..
Python 2.x gotcha's and landmines http://stackoverflow.com/questions/530530/python-2-x-gotchas-and-landmines when the function is defined not when it 䏭 called. Example consider defaulting an argument to the current time import time def report..
Python's use of __new__ and __init__? http://stackoverflow.com/questions/674304/pythons-use-of-new-and-init pipermail tutor 2008 April 061426.html You should consider that what you are trying to do is usually done with a Factory.. it. Using __new__ is not a good clean solution so please consider the usage of a factory. Here you have a good factory example..
Seeking clarification on apparent contradictions regarding weakly typed languages http://stackoverflow.com/questions/9929585/seeking-clarification-on-apparent-contradictions-regarding-weakly-typed-language such thing is possible in Java and in C# and we do not consider them weakly typed just for that. Java int a 10 String b b String.. or coercion between types as perl may end up being considered weakly typed whereas other languages that provide only a few.. that provide only a few conversions may end up being considered strongly typed. I am inclined to believe though that I must..
Python lambda's binding to local values http://stackoverflow.com/questions/10452770/python-lambdas-binding-to-local-values it is called. This is not something special about lambdas. Consider x before foo defined def foo print x x after foo was defined..
How can I parse JSON in Google App Engine? http://stackoverflow.com/questions/1171584/how-can-i-parse-json-in-google-app-engine json google app engine share improve this question Consider using Django's json lib which is included with GAE. from django.utils..
Why does Python pep-8 strongly recommend spaces over tabs for indentation? http://stackoverflow.com/questions/120926/why-does-python-pep-8-strongly-recommend-spaces-over-tabs-for-indentation other underlying reason do you need To put it less bluntly Consider also the scope of the PEP as stated in the very first paragraph..
Python cannot handle numbers string starting with 0. Why? http://stackoverflow.com/questions/13013638/python-cannot-handle-numbers-string-starting-with-0-why 012 syntax to avoid strange backward compatibility bugs. Consider your python2.x script which using octal literal constants a..
http://stackoverflow.com/questions/1450275/modifying-locals-in-python in Python 3.0. Is there any way round this Use Case Consider @depends a b c d e f def test put_into_locals test.dependencies..
How do you organize Python modules? [closed] http://stackoverflow.com/questions/171785/how-do-you-organize-python-modules When creating your own packages use distutils setuptools. Consider using paster create see http pythonpaste.org to create your..
Is `import module` better coding style than `from module import function`? http://stackoverflow.com/questions/1744258/is-import-module-better-coding-style-than-from-module-import-function the as clause can be used as a single statement to edit. Consider your pro FMIF point 3 call it R for redirection vs your pro..
Required widgets for displaying a 1D console application http://stackoverflow.com/questions/17846930/required-widgets-for-displaying-a-1d-console-application ' ' ' ' ' ' ' ' ' ' _________________________ Consider the outer rectangle as one window or widget that contains the..
Why program functionally in Python? http://stackoverflow.com/questions/1892324/why-program-functionally-in-python a stack trace or otherwise debug a problem need I go on . Consider what's probably the single most idiotic idiom you sometimes..
How can I quantify difference between two images? http://stackoverflow.com/questions/189943/how-can-i-quantify-difference-between-two-images choice of norm to use for the difference between images. Consider using Manhattan norm the sum of the absolute values or zero..
What do (lambda) function closures capture in Python? http://stackoverflow.com/questions/2295290/what-do-lambda-function-closures-capture-in-python I came around something peculiar in the way closures work. Consider the following code adders 0 1 2 3 for i in 0 1 2 3 adders i..
How do you return multiple values in Python? http://stackoverflow.com/questions/354883/how-do-you-return-multiple-values-in-python values in languages that support it is often tupling . Consider this trivial example def f x y0 x 1 y1 x 3 y2 y0 y3 return y0.. python the obvious way to do this is by means of a dict . Consider the following def g x y0 x 1 y1 x 3 y2 y0 y3 return 'y0' y0..
Python: Best way to check for Python version in a program that uses new language features? http://stackoverflow.com/questions/446052/python-best-way-to-check-for-python-version-in-a-program-that-uses-new-language that some syntax is illegal in older versions of Python. Consider this program import sys if sys.version_info 2 4 raise must use..
Extending python - to swig, not to swig or Cython http://stackoverflow.com/questions/456884/extending-python-to-swig-not-to-swig-or-cython and use that library directly from python with cstruct . Consider also Cython if you want to use only python code in your program...
Simulating a 'local static' variable in python http://stackoverflow.com/questions/460586/simulating-a-local-static-variable-in-python a 'local static' variable in python Consider the following code def CalcSomething a if CalcSomething._cache.has_key..
How does Python's “super” do the right thing? http://stackoverflow.com/questions/607186/how-does-pythons-super-do-the-right-thing to calls of super in the parent classes the correct order. Consider this example code # usr bin python class A object def __init__..
Chain-calling parent constructors in python http://stackoverflow.com/questions/904036/chain-calling-parent-constructors-in-python calling parent constructors in python Consider this a base class A class B inheriting from A class C inheriting..
Python: simple list merging based on intersections http://stackoverflow.com/questions/9110837/python-simple-list-merging-based-on-intersections simple list merging based on intersections Consider there are some lists of integers as # 0 0 1 3 1 1 0 3 4 5..
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