how to add to a variable in python code example

Example 1: how to add variables python

x = 5
y = 10
x+y
#result = 15

Example 2: how to create a variable in C#

int variable;

Example 3: adding variable in python

var = 0
while True:
    import time
    var = (var + 1)
    print(var)
    time.sleep (1)

Example 4: how to make a variable in php

$varName = "Hello, World";