


Detailed explanation of python functions map, filter, and reduce
This article shares with you a detailed explanation of the python functions map, filter, and reduce. The content is quite good. I hope it can help friends in need
##1 .map
Map will map a function to all elements of an input list. This is its specification:
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Map allows us to achieve it in a much simpler and more beautiful way. That's it:
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map,
So I did the same thing above. Not only for a list of inputs, we can even use it for a list of functions!
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2.Filter
顾名思义,filter
过滤列表中的元素,并且返回一个由所有符合要求的元素所构成的列表,符合要求
即函数映射到该元素时返回值为True. 这里是一个简短的例子:
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这个filter
类似于一个for
循环,但它是一个内置函数,并且更快。
注意:如果map
和filter
对你来说看起来并不优雅的话,那么你可以看看另外一章:列表/字典/元组推导式。
3.Reduce
当需要对一个列表进行一些计算并返回结果时,Reduce
是个非常有用的函数。举个例子,当你需要计算一个整数列表的乘积时。
通常在 python 中你可能会使用基本的 for 循环来完成这个任务。
现在我们来试试 reduce:
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