does i++ work in python code example

Example 1: what is += python

>>> a = 10
>>> a += 5
>>> a
15

Example 2: i += 1 meaning in python

n = int(raw_input())
    
    
    for i in range(0, 5):
        print i
    
    i = 0
    while i < 5:
        i += 1
        print (i*i);