So if you want to write 2 variable as a CSV row you can put them in a tuple or list: writer.writerows((variable1,2))Īlso from itertools you can import zip_longest as a more flexible function which you can use it on iterators with different size. izip() izip() returns an iterator that combines the elements of the passed iterators into tuples. In this case since zip's arguments must support iteration you can not use 2 as its argument. seqlengths) for seq, stagid, length in izip(data0, stagids, seqlengths): output.append((seq.
However, a comment on one of my Stack Overflow answers implies that there may be a better way. This page shows Python examples of itertools.izip. A common idiom that I use for Python2-Python3 compatibility is: try: from itertools import izip except ImportError: python3.x izip zip. Print(timeit('list(zip(range(100), range(100)))', number=500000)) Import 'izip' for different versions of Python. So, you would use itertools.izip(a, b) when the two inputs a, b are too big to keep in memory at one time.
#Izip python zip#
Here is a benchmark between zip in Python 2 and 3 and izip in Python 2: Python iterators are a 'lazy loaded' sequence that saves memory over regular in-memory list. I’m not sure just what it is about zip that I enjoy, but I have often found it to be quite useful.
#Izip python series#
As I understand, the zip function takes two lists and makes an iterator for it, which give a series of tuples for every iteration in the lists, right the thing is, whenever the iteration ends, the zip disappears. The zip implementation is almost completely copy-pasted from the old izip, just with a few names changed and pickle support added. When to use izip (and how) in Python3 Hi. Combine two unbounded lists examples/iterators/izip.py. 4 Answers Sorted by: 103 zip computes all the list at once, izip computes the elements only when requested. In Python 3 the built-in zip does the same job as itertools.izip in 2.X(returns an iterator instead of a list). Python 3 does not need this any more as the built-in zip is already an iterator.
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