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python Programming Glossary: approachWhat can you use Python generator functions for? http://stackoverflow.com/questions/102535/what-can-you-use-python-generator-functions-for it would periodically call this callback. The generator approach is that the work function now a generator knows nothing about.. result. If you want to see an example of the latter two approaches see os.path.walk the old filesystem walking function with.. wanted to collect all results in a list the generator approach is trivial to convert to the big list approach big_list list..
How to generate all permutations of a list in Python http://stackoverflow.com/questions/104420/how-to-generate-all-permutations-of-a-list-in-python or are just curios to know how it works here's one nice approach taken from http code.activestate.com recipes 252178 def all_perms.. yield perm i elements 0 1 perm i A couple of alternative approaches are listed in the documentation of itertools.permutations..
Get last n lines of a file with Python, similar to tail http://stackoverflow.com/questions/136168/get-last-n-lines-of-a-file-with-python-similar-to-tail offset or None avg_line_length 1.3 Is this a reasonable approach What is the recommended way to tail log files with offsets ..
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 u hello '__getitem__' Out 14 True Another general pythonic approach is to assume an iterable then fail gracefully if it does not..
How to implement an efficient infinite generator of prime numbers in Python? http://stackoverflow.com/questions/2211990/how-to-implement-an-efficient-infinite-generator-of-prime-numbers-in-python 100 of them at a time. Would you use the same Sieve approach as well as the frequency of prime numbers formula I prefer non.. frequency of prime numbers formula I prefer non concurrent approach. Thank you for reading and writing python generator primes..
Python - Is a dictionary slow to find frequency of each character? http://stackoverflow.com/questions/2522152/python-is-a-dictionary-slow-to-find-frequency-of-each-character the table doesn't include the time it takes to load files. approach american english big.txt time w.r.t. defaultdict time seconds..
Import a module from a relative path http://stackoverflow.com/questions/279237/import-a-module-from-a-relative-path it doesn't not always contains the path As a bonus this approach does let you force Python to use your module instead of the..
Weighted random selection with and without replacement http://stackoverflow.com/questions/352670/weighted-random-selection-with-and-without-replacement in memory. Does anyone have any suggestions on the best approach in this situation I have my own solutions but I'm hoping to..
In Python, why can a function modify some arguments as perceived by the caller, but not others? http://stackoverflow.com/questions/575196/in-python-why-can-a-function-modify-some-arguments-as-perceived-by-the-caller others I'm new to Python and am trying to understand its approach to variable scope. In this example why is f able to alter the..
Django Passing Custom Form Parameters to Formset http://stackoverflow.com/questions/622982/django-passing-custom-form-parameters-to-formset request.affiliate extra 3 I think this is the cleanest approach and doesn't affect ServiceForm in any way i.e. by making it..
Python @property versus getters and setters http://stackoverflow.com/questions/6618002/python-property-versus-getters-and-setters it either way. If you would design a Python program which approach would you use and why python properties getter setter share..
Static class variables in Python http://stackoverflow.com/questions/68645/static-class-variables-in-python but I'm still a little fuzzy on the advantages of this approach over staticmethod. If you are too then it probably doesn't matter...
http://stackoverflow.com/questions/7933596/django-dynamic-model-fields associate it with the concrete model. Is there a better approach Options that have been pre emptively discarded Custom SQL to.. this question As of today there are four available approaches two of them requiring a certain storage backend Django eav.. which stores editable and indexable dictionary. This approach is good in a sense that it lets you have the best of both worlds..
How do I check if a file exists using Python? http://stackoverflow.com/questions/82831/how-do-i-check-if-a-file-exists-using-python add to the answers it's usually safer to use the following approach try with open 'filename' process except IOError print 'Oh dear.'..
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 gets is even faster than scanf or the unsynchronized cin approach. I also learned that scanf and gets are both UNSAFE and should.. disk comparing the python the unsynced cin and the fgets approaches as well as comparing with the wc utility. The scanf version.. in C vs Python... a similar speed story where the naive approach is slower in C Edit for clarity removed tiny bug in original..
Python Pandas: how to turn a DataFrame with “factors” into a design matrix for linear regression? http://stackoverflow.com/questions/10196860/python-pandas-how-to-turn-a-dataframe-with-factors-into-a-design-matrix-for-l set from the textbook #Introductory Econometrics A Modern Approach #by Jeffrey Wooldridge y X patsy.dmatrices sl ~ 1 sx rk yr dg..
Parsing Source Code (Python) Approach: Beautiful Soup, lxml, html5lib difference? http://stackoverflow.com/questions/10942730/parsing-source-code-python-approach-beautiful-soup-lxml-html5lib-difference Source Code Python Approach Beautiful Soup lxml html5lib difference I have a large HTML..
http://stackoverflow.com/questions/16006404/how-to-find-most-common-element-in-list-and-if-theres-a-tie-the-one-whos-las use some help. python share improve this question Approach Find the most frequently occurring items Counter.most_common..
Including non-Python files with setup.py http://stackoverflow.com/questions/1612733/including-non-python-files-with-setup-py Ian Bicking's presentation for more info. UPDATE Another Approach Another approach that works well if you just want to control..
What is a good Python library for decision trees? [closed] http://stackoverflow.com/questions/3127922/what-is-a-good-python-library-for-decision-trees
Numpy: Joining structured arrays? http://stackoverflow.com/questions/5355744/numpy-joining-structured-arrays 5 6 9 12 dtype 'x' int 'y' int 'z' int 'w' float Current Approach This is what I'm currently using but it is very slow so I suspect..
Python group by array a, and summarize array b - Performance http://stackoverflow.com/questions/7538382/python-group-by-array-a-and-summarize-array-b-performance for sure are far from the lower performance boundary. Approach 1 at least nice and short Time 0.769315958023 def approach_2.. bResult sum b i a for i in np.unique a aResult np.unique a Approach 2 numpy.groupby horribly slow Time 4.65299129486 def approach_2.. key bResult.append sum i 1 for i in group Update Approach3 by Pablo. Time 1.0265750885 def approach_Pablo a b pdf defaultdict..
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