import itertools
from itertools import izip_longest

x = izip_longest([1,2,3], [1,2])
y = itertools.izip_longest([1,2,3], [1,2])

# Expected file after 2to3 is:
#
# import itertools
# from itertools import zip_longest
#
# x = zip_longest([1,2,3], [1,2])
# y = itertools.zip_longest([1,2,3], [1,2])