How to use map in python

#How to use the map method in python? Let me introduce you to the specific method:

Description

map() will map the specified sequence according to the provided function.

The first parameter function calls the function function with each element in the parameter sequence and returns a new list containing the return value of each function function.

Syntax

map() function syntax:

map(function, iterable, ...)

Parameters

function -- function iterable -- one or more sequences

Related recommendations: "python video tutorial"

Return value

Python 2.x Returns a list.

Python 3.x Returns the iterator.

Example

The following example shows the use of map():

>>>def square(x) :            # 计算平方数   
       return x ** 2...
>>> map(square, [1,2,3,4,5])   # 计算列表各个元素的平方
[1, 4, 9, 16, 25]
>>> map(lambda x: x ** 2, [1, 2, 3, 4, 5])  # 使用 lambda 匿名函数
[1, 4, 9, 16, 25]
 # 提供了两个列表，对相同位置的列表数据进行相加
>>> map(lambda x, y: x + y, [1, 3, 5, 7, 9], [2, 4, 6, 8, 10])
[3, 7, 11, 15, 19]

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