Python map to apply function to each element of an iterable like list, tuple,set

map function

By using map we can apply function to each item of any iterable

map(function,iterable)

function can be built in or user defined
iterable can be list, tuple , set etc

Using built-in function

String function len returns length of a string.

my_list=['Alex','Ronald','John']
my_list1=map(len,my_list) # using built in function len 
print(list(my_list1))

Output

[4, 6, 4]

Using user defined function

The function my_function will add 5 and return to each number it receives.

MATH=[20,30,40]
def my_function(n):
    return n+5
my_list1=map(my_function,MATH)
print(list(my_list1))

Output

[25, 35, 45]

Using Multiple iterators

We can get sum of three subjects

MATH=[20,30,40]
ENGLISH=[30,40,50]
SCIENCE=[40,50,60]
def my_function(a,b,c):
    return a+b+c
my_list1=map(my_function,MATH,ENGLISH,SCIENCE)
print(list(my_list1))

Output

[90, 120, 150]

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