Python3 map() Function
Python3 Built-in FunctionsDescription
The map() function maps the specified sequence according to the provided function.
The first parameter function is called with each element in the parameter sequence, and returns a new list containing the return value of each function call.
Syntax
The following is the syntax of the map() method:
map(function, iterable, ...)
Parameters
- function -- A function
- iterable -- One or more sequences
Return Value
Returns an iterator.
Examples
The following examples demonstrate how to use map():
Python3.x Examples
>>> def square(x) : # Calculate square numbers
... return x ** 2
...
>>> map(square, [1,2,3,4,5]) # Calculate the square of each element in the list
<map object at 0x100d3d550> # Returns an iterator
>>> list(map(square, [1,2,3,4,5])) # Use list() to convert to a list
[1, 4, 9, 16, 25]
>>> list(map(lambda x: x ** 2, [1, 2, 3, 4, 5])) # Use lambda anonymous function
[1, 4, 9, 16, 25]
>>>
... return x ** 2
...
>>> map(square, [1,2,3,4,5]) # Calculate the square of each element in the list
<map object at 0x100d3d550> # Returns an iterator
>>> list(map(square, [1,2,3,4,5])) # Use list() to convert to a list
[1, 4, 9, 16, 25]
>>> list(map(lambda x: x ** 2, [1, 2, 3, 4, 5])) # Use lambda anonymous function
[1, 4, 9, 16, 25]
>>>