python what does map function do code example

Example 1: mapping in python string

# mapping function
def uppercase(u):
    return str(u.upper())

map_iterator = map(uppercase,['a','b','c'])
mylist = list(map_iterator)
print(mylist)

Example 2: map function to change type of element in python

nums = ['3','4','7']
nums = list(map(int, nums))
print(nums)