lambda arguments unpack error

Question

In Python 2 this code is OK:

f = lambda (m, k): m + k

m = [1,2,3,4]
k = [5,6,7,8]

print(map(f, zip(m, k)))

but in Python 3 the following

Answer 1

You can use the same syntax in both Python 2 and Python 3 if you use itertools.starmap instead of map which unpacks the tuple items for us:

>>> from itertools import starmap
>>> f = lambda m, k: m + k
>>> list(starmap(f, zip(m, k)))
[6, 8, 10, 12]