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python Programming Glossary: groupergroup by year, month, day in a sqlalchemy http://stackoverflow.com/questions/1370997/group-by-year-month-day-in-a-sqlalchemy can group in python like from itertools import groupby def grouper item return item.created.year item.created.month for year month..
Alternative way to split a list into groups of n http://stackoverflow.com/questions/1624883/alternative-way-to-split-a-list-into-groups-of-n Python recipe In Python 2.6 use itertools.izip_longest def grouper n iterable fillvalue None grouper 3 'ABCDEFG' 'x' ABC DEF Gxx.. def grouper n iterable fillvalue None grouper 3 'ABCDEFG' 'x' ABC DEF Gxx args iter iterable n return itertools.zip_longest.. args fillvalue fillvalue Example usage list grouper 3 range 9 0 1 2 3 4 5 6 7 8 list grouper 3 range 10 0 1 2 3..
What is the most “pythonic” way to iterate over a list in chunks? http://stackoverflow.com/questions/434287/what-is-the-most-pythonic-way-to-iterate-over-a-list-in-chunks from the recipes section of Python's itertools docs def grouper iterable n fillvalue None args iter iterable n return izip_longest.. fillvalue Example In pesudocode to keep the example terse. grouper 'ABCDEFG' 3 'x' 'ABC' 'DEF' 'Gxx' Note izip_longest is new to..
Creating a python dictionary from a line of text http://stackoverflow.com/questions/4356329/creating-a-python-dictionary-from-a-line-of-text It's possible to create a generalized version I'll call grouper which again corresponds to a similarly named but functionally.. different itertools recipe listed right below pairwise def grouper n iterable s s0 s1 ...sn 1 sn sn 1 ...s2n 1 s2n s2n 1 ...s3n.. could be used thusly within your for loop record dict grouper 2 fields Of course for a specific case like this it's easy to..
http://stackoverflow.com/questions/4501636/creating-sublists range 0 len seq 3 Out 18 1 2 3 4 5 6 7 8 There is also the grouper idiom In 19 import itertools In 20 list itertools.izip_longest..
Python how to read N number of lines at a time http://stackoverflow.com/questions/6335839/python-how-to-read-n-number-of-lines-at-a-time break # process next_n_lines An alternative is to use the grouper pattern with open ... as f for next_n_lines in izip_longest..
python convert list to dictionary [duplicate] http://stackoverflow.com/questions/6900955/python-convert-list-to-dictionary dictionary share improve this question Using the usual grouper recipe you could do d dict itertools.izip_longest iter l 2 fillvalue..
http://stackoverflow.com/questions/7133179/python-yield-and-delete take up memory For example in the following function def grouper iterable chunksize Return elements from the iterable in `chunksize`.. of collection is not divisible by `chunksize` . print list grouper xrange 10 3 0 1 2 3 4 5 6 7 8 9 i iter iterable while True.. self.val None return val And could be used like def grouper iterable chunksize i iter iterable while True chunk Wrap list..
Iterate an iterator by chunks (of n) in Python? http://stackoverflow.com/questions/8991506/iterate-an-iterator-by-chunks-of-n-in-python python iterator share improve this question The grouper recipe from the itertools documentation's recipes comes close.. documentation's recipes comes close to what you want def grouper n iterable fillvalue None grouper 3 'ABCDEFG' 'x' ABC DEF Gxx.. to what you want def grouper n iterable fillvalue None grouper 3 'ABCDEFG' 'x' ABC DEF Gxx args iter iterable n return izip_longest..
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