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python Programming Glossary: izip_longesthttp://stackoverflow.com/questions/1528711/reading-lines-2-at-a-time itertools with open fn as f for line line2 in itertools.izip_longest f f fillvalue '' print line line2 Alas izip_longest requires.. f f fillvalue '' print line line2 Alas izip_longest requires Python 2.6 or better 2.5 only has izip which would.. def natatime itr fillvalue None n 2 return itertools.izip_longest iter itr n fillvalue fillvalue itertools is generally the best..
how can I iterate through two lists in parallel in Python? [duplicate] http://stackoverflow.com/questions/1663807/how-can-i-iterate-through-two-lists-in-parallel-in-python and should be replaced by itertools.izip or itertools.izip_longest which returns an iterator instead of a list. import itertools.. b in itertools.izip foo bar print f b for f b in itertools.izip_longest foo bar print f b izip stops when either foo or bar is exhausted... print f b izip stops when either foo or bar is exhausted. izip_longest stops when both foo and bar are exhausted. When the shorter..
split a generator/iterable every n items in python (splitEvery) http://stackoverflow.com/questions/1915170/split-a-generator-iterable-every-n-items-in-python-splitevery 3 'ABCDEFG' 'x' ABC DEF Gxx args iter iterable n return izip_longest fillvalue fillvalue args It does mention a method that truncates..
interleaving 2 lists of unequal lengths [duplicate] http://stackoverflow.com/questions/19883826/interleaving-2-lists-of-unequal-lengths share improve this question You can use itertools.izip_longest here from itertools import izip_longest xs 1 2 3 ys hi bye no.. can use itertools.izip_longest here from itertools import izip_longest xs 1 2 3 ys hi bye no yes why s object y for x in izip_longest.. xs 1 2 3 ys hi bye no yes why s object y for x in izip_longest xs ys fillvalue s for y in x if y is not s 1 'hi' 2 'bye' 3..
Yield multiple objects at a time from an iterable object? http://stackoverflow.com/questions/2202461/yield-multiple-objects-at-a-time-from-an-iterable-object 3 'ABCDEFG' 'x' ABC DEF Gxx args iter iterable n return izip_longest fillvalue fillvalue args Zipping the same iterator several times..
zip() alternative for iterating through two iterables http://stackoverflow.com/questions/2323394/zip-alternative-for-iterating-through-two-iterables ... If the files are of different sizes you may use izip_longest as izip will stop at the smaller file. share improve this answer..
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 iterable n fillvalue None args iter iterable n return izip_longest args fillvalue fillvalue Example In pesudocode to keep the example..
http://stackoverflow.com/questions/4501636/creating-sublists grouper idiom In 19 import itertools In 20 list itertools.izip_longest iter seq 3 Out 20 1 2 3 4 5 6 7 8 None but note that missing.. note that missing elements are filled with the value None. izip_longest can take a fillvalue parameter as well if something other than..
http://stackoverflow.com/questions/4628290/pairs-from-single-list last element something that can be achieved with itertools.izip_longest . Finally Note that in Python 3.x zip behaves as itertools.izip.. you obviously might need a fillvalue from itertools import izip_longest def blockwise t size 2 fillvalue None it iter t return izip_longest..
Efficient way of parsing fixed width files in Python http://stackoverflow.com/questions/4914008/efficient-way-of-parsing-fixed-width-files-in-python the ability to have padding fields. from itertools import izip_longest try from itertools import accumulate # added in Py 3.2 except.. in fieldwidths # True values for padding fields flds tuple izip_longest pads 0 cuts cuts 1 parse lambda line tuple line i j for pad..
How to chunk a list in Python 3? http://stackoverflow.com/questions/5850536/how-to-chunk-a-list-in-python-3 code that is compatible with python2 from itertools import izip_longest def grouper n iterable padvalue None grouper 3 'abcdefg' 'x'.. 3 'abcdefg' 'x' 'a' 'b' 'c' 'd' 'e' 'f' 'g' 'x' 'x' return izip_longest iter iterable n fillvalue padvalue However this isn't working.. . I get the following error ImportError cannot import name izip_longest Can someone help I'd like to convert my list of 1 2 3 4 5 6..
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
Iterate an iterator by chunks (of n) in Python? http://stackoverflow.com/questions/8991506/iterate-an-iterator-by-chunks-of-n-in-python 3 'ABCDEFG' 'x' ABC DEF Gxx args iter iterable n return izip_longest fillvalue fillvalue args It will fill up the last chunk with..
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