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map函数在python2和python3中稍有不同，python2直接返回一个列表，python3则返回一个map的可迭代对象一、python2的官方解释：map(...) map(function, sequence[, sequence, ...]) -> list Return a list of the results of applying the fu...

首先看reduce函数的官方解释（python2）：reduce(...) reduce(function, sequence[, initial]) -> value Apply a function of two arguments cumulatively to the items of a sequence, from left to right,...

下面是python3的解释：class zip(object) | zip(iter1 [,iter2 [...]]) --> zip object | | Return a zip object whose .__next__() method returns a tuple where | the i-th element comes from the i-th i...