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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]
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