107 – map’s keyword argument strict

Akin to zip’s keyword argument strict, in Python 3.14 the built-in map got a keyword argument strict. By setting strict=True, you get a ValueError if the iterables have different lengths:

bases = [2, 3, 4, 2, 3, 4]
exps = [2, 2, 2]

for num in map(pow, bases, exps, strict=True):
    print(num, end=" ")
# 4 9 16
# ValueError

In 99% of the situations where you use map with multiple arguments you’ll want to set this, so don’t forget it!