I am trying to import the izip module like so:
from itertools import izip
However after recently changing over from Python 2.7 to 3 - it doesn't seem to work.
I am trying to write to a csv file:
writer.writerows(izip(variable1,2))
But I have no luck. Still encounter an error.
In Python 3 the built-in zip
does the same job as itertools.izip
in 2.X(returns an iterator instead of a list). The zip
implementation is almost completely copy-pasted from the old izip
, just with a few names changed and pickle support added.
Here is a benchmark between zip
in Python 2 and 3 and izip
in Python 2:
from timeit import timeit
print(timeit('list(izip(xrange(100), xrange(100)))',
'from itertools import izip',
number=500000))
print(timeit('zip(xrange(100), xrange(100))', number=500000))
Output:
1.9288790226
1.2828938961
from timeit import timeit
print(timeit('list(zip(range(100), range(100)))', number=500000))
Output:
1.7653984297066927
In this case since zip
's arguments must support iteration you can not use 2 as its argument. 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))
Also from itertools
you can import zip_longest
as a more flexible function which you can use it on iterators with different size.