Definition and Usage
The map() function executes a specified function for each item in an iterable. The item is sent to the function as a parameter.
Python map() function
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:
Parameter
- 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) .
Example 1:
# Double all numbers using map and lambda
numbers = (2, 4, 6, 8)
result = map(lambda x: x + x, numbers)
print(list(result))
Output:
Example 2:
# List of strings
l = [‘wikitechy’, ‘wiki’]
# map() can listify the list of strings individually
test = list(map(list, l))
print(test)
Output:
[[‘w’, ‘i’, ‘k’, ‘i’, ‘t’, ‘e’, ‘c’, ‘k’, ‘y’], [‘w’, ‘i’, ‘k’, ‘i’]]
Example 3:
# Python program to demonstrate working
# of map.
# Return double of n
def addition(n):
return n + n
# We double all numbers using map()
numbers = (2, 4, 6, 8)
result = map(addition, numbers)
print(list(result))
Output:
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