Length of longest word in a list

Question

What is the more pythonic way of getting the length of the longest word:

len(max(words, key=len))

Or:

max(len(w) for w in words)

Answer 1

I'd say

len(max(x, key=len))

looks quite good because you utilize a keyword argument (key) of a built-in (max) with a built-in (len). So basically max(x, key=len) gets you almost the answer. But none of your code variants look particularly un-pythonic to me.