Reverse the first half of list elements in python

Description

Python Program to get list size n and n elements of list, then reverse the first n/2 elements.
Input:
5
5 7 9 3 1
Output:
7 5 9 3 1

Solution

l=list(map(int,input("Enter Numbers:").split()))
start=0
stop=len(l)//2 -1
while(start<stop):
    l[start],l[stop]=l[stop],l[start]
    start+=1
    stop-=1
print(l)

Explanation

initialize start to first location of list and stop to last location of list using
start=0
stop=len(l)/2-1

swap the elements in location start and stop, then increment start by 1 and decrement stop by 1.
l[start],l[stop]=l[stop],l[start]

repeat the above step till start is less than stop



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