Question

Given a set where each element is a string, how can I reduce the set into an integer that is the sum of the length of these strings?

setA = ("hi", "hello", "bye")
reduce(lambda .... for word in setA)

Calling reduce with some lambda function should return 10 (2 + 5 + 3).

I can do it with a couple lambdas, I think, but there must be a cleaner way.

Answer 1

If you really want to do this with a lambda and reduce, you can:

reduce(lambda x, y: x + len(y), s, 0)

But I’m not sure why you’d want to reduce from 0 instead of just using sum, in which case your lambda is just lambda y: len(y), which is equivalent to just len.