functools.reduce

Question

functools.reduce

Accepted Answer

reduce() applies a function cumulatively to a sequence. Starting with 1: (1+2)=3, (3+3)=6, (6+4)=10. This is equivalent to sum(nums) for addition. reduce is most useful for operations that do not have a dedicated built-in - for example, computing a product: reduce(lambda a, b: a*b, nums). An optional initial value can be passed as the third argument: reduce(fn, nums, 0).