How to use map ,list function in python||Map,list || Python Tutorial || Learn Python Programming

Publié le: 01 janvier 1970
sur la chaîne: Saayan Biswas

map() function returns a map object(which is an iterator) of the results after applying the given function to each item of a given iterable (list, tuple etc.)

Syntax :

map(fun, iter)
Parameters :

fun : It is a function to which map passes each element of given iterable.
iter : It is a iterable which is to be mapped.

NOTE : You can pass one or more iterable to the map() function.

Returns :

Returns a list of the results after applying the given function
to each item of a given iterable (list, tuple etc.)

NOTE : The returned value from map() (map object) then can be passed to functions like list() (to create a list), set() (to create a set) .

CODE 1

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Python program to demonstrate working
of map.

Return double of n
def addition(n):
return n + n

We double all numbers using map()
numbers = (1, 2, 3, 4)
The map() function executes a specified function for each item in a iterable. The item is sent to the function as a parameter.
How to use map ,list function in python||Map,list || Python Tutorial || Learn
Python Programming Saayan Biswas
result = map(addition, numbers)
print(list(result))
Output :

[2, 4, 6, 8]

CODE 2
We can also use lambda expressions with map to achieve above result.

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Double all numbers using map and lambda

numbers = (1, 2, 3, 4)
result = map(lambda x: x + x, numbers)
print(list(result))
Output :

[2, 4, 6, 8]

CODE 3

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Add two lists using map and lambda

numbers1 = [1, 2, 3]
numbers2 = [4, 5, 6]

result = map(lambda x, y: x + y, numbers1, numbers2)
print(list(result))

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