map函数学习

最新推荐文章于 2025-07-01 17:32:01 发布

转载最新推荐文章于 2025-07-01 17:32:01 发布 · 1.4k 阅读

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本文详细介绍了Python中map函数的工作原理及其用法。通过具体的示例展示了如何将一个函数应用于多个可迭代对象，并返回处理结果的列表。同时，讨论了当函数为None时map的行为，以及如何处理不同长度的可迭代对象。

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函数定义：

map(function, iterable, ...)

Apply function to every item of iterable and return a list of the results. If additional iterable arguments are passed, function must take that many arguments and is applied to the items from all iterables in parallel. If one iterable is shorter than another it is assumed to be extended withNoneitems. If function isNone, the identity function is assumed; if there are multiple arguments, map() returns a list consisting of tuples containing the corresponding items from all iterables (a kind of transpose operation). The iterable arguments may be a sequence or any iterable object; the result is always a list.

def abc(a, b, c):
...     return a*10000 + b*100 + c
... 
>>> list1 = [11,22,33]
>>> list2 = [44,55,66]
>>> list3 = [77,88,99]
>>> map(abc,list1,list2,list3)
[114477, 225588, 336699]