The built-in function map() helps to execute the given function to each and every element of a specified iterable (list, tuple, set, dictionary, string, etc.) and returns a list of the results.
map(function, iterable, ...) #where iterable can be list, tuple etc
Takes two parameters. We can pass multiple iterator objects to map() function in such case, the given function must have that many arguments.
Parameter | Description | Required / Optional |
---|---|---|
function | The function to be called for each element of the specified iterable. | Required |
iterable | iterable which is to be mapped | Required |
The returned value from map() (map object) can then be passed to functions like list() (to create a list), set() (to create a set) and so on.
Input | Return Value |
---|---|
iterable | iterator object of the map class |
def calculateSquare(n):
return n*n
numbers = (1, 2, 3, 4)
result = map(calculateSquare, numbers)
print(result)
# converting map object to set
numbersSquare = set(result)
print(numbersSquare)
Output:
numbers = (1, 2, 3, 4)
result = map(lambda x: x*x, numbers)
print(result)
# converting map object to set
numbersSquare = set(result)
print(numbersSquare)
Output:
num1 = [4, 5, 6]
num2 = [5, 6, 7]
result = map(lambda n1, n2: n1+n2, num1, num2)
print(list(result))
Output:
[9, 11, 13]
# map() with string
map_iterator = map(to_upper_case, 'abc')
print(type(map_iterator))
print_iterator(map_iterator)
Output:
A B C