Remove the spaces in String python

Description

python program to get a String and remove the spaces
Input
Hello World
Output:
HelloWorld

Solution

s1=input("Enter a String:")
s2=""
for i in s1:
    if(i!=" "):
        s2+=i
s1=s2
print(s1)

Explanation

visit each location in string s1, if charcter in the location is not  a space then append it in s2, finally store s2 in s1. 
Note:
String is immutable, so you cannot modify a character directly in a orginal string.