What does map in python mean?

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.

map() Function syntax:

map(function, iterable, ...)

Parameters:

function -- function

iterable -- one or more sequences

Return value:

Python 2.x returns a list.

Python 3.x Returns the iterator.

The following examples show how to use 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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