python reduce 函数使用详解

reduce() 函数在 python 2 是内置函数， 从python 3 开始移到了 functools 模块。 官方文档是这样介绍的 reduce(...) reduce(function, sequence[, initial]) -> value Apply a function of two arguments cumulatively to the items of a sequence, from left to right, so as to reduce the sequence to a single value. For example, reduce(lambda