I was wondering which would be the pythonic and efficient way to do it, and found this on Google: pairs = zip(t, t) Often enough, I’ve found the need to process a list by pairs. List2 inally, use the for loop to iterate through lists in zip function and write the result in the file (after converting a tuple to string): for i in zip(. Return izip(islice(t, None, None, 2), islice(t, 1, None, 2))įor f in pairs_1, pairs_2, pairs_3, pairs_4: I thought that was pythonic enough, but after a recent discussion involving idioms versus efficiency, I decided to do some tests: import timeĭef pairs_1( t): return zip(t, t)ĭef pairs_2( t): return izip(t, t)ĭef pairs_3( t): return izip(islice(t, None, None, 2), islice(t, 1, None, 2)) If I’m interpreting them correctly, that should mean that the implementation of lists, list indexing, and list slicing in Python is very efficient. Is there another, “better” way of traversing a list in pairs? It’s a result both comforting and unexpected. Which would be the right way to ensure that all elements are included? Note that if the list has an odd number of elements then the last one will not be in any of the pairs. Most efficient and very pythonic: pairs = izip(** 2) Most pythonic and very efficient: pairs = izip(t, t) I added these two suggestions from the answers to the tests: def pairwise( t): How to Use Pythons zip () Function Try it Yourself Try running the following examples in your favorite IDE. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. Learn Python Today With These 8 Amazing Courses. Python () Examples The following are 30 code examples of (). It took me a moment to grok that the first answer uses two iterators while the second uses a single one. How to Run a Successful Facebook Contest Ideas Tips and Examples How to Create a Unique Instagram. As a first example, lets pick two lists L1 and L2 that contain 5 items each. chain () The chain () function takes several iterators as arguments. Lets call the zip () function and pass in L1 and L2 as arguments. Python Itertools - chain, isSlice, and izip Explained with Examples Itertools is a Python module of functions that return generators, which are objects that only function when iterated over. Each has been recast in a form suitable for. To deal with sequences with an odd number of elements, the suggestion has been to augment the original sequence adding one element ( None) that gets paired with the previous last element, something that can be achieved with itertools.izip_longest(). This module implements a number of iterator building blocks inspired by constructs from APL, Haskell, and SML. You can rate examples to help us improve the quality of examples. By voting up you can indicate which examples are most useful and appropriate. Each time we call the next method on the. Note that, in Python 3.x, zip() behaves as itertools.izip(), and itertools.izip() is gone. These are the top rated real world Python examples of blazepy2help.izip extracted from open source projects. Here are the examples of the python api itertools.izip taken from open source projects. The built-in function iter takes an iterable object and returns an iterator.
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