Does python have map?

The built-in map() function in Python 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

Return value

Python 2.x returns a list.

Python 3.x Returns the iterator.

Example: 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]

The above is the detailed content of Does python have map?. For more information, please follow other related articles on the PHP Chinese website!