exponential modulo in py code example

Example: exponential modulo in py

(ab) mod p = ( (a mod p) (b mod p) ) mod p 

For example a = 50,  b = 100, p = 13
50  mod 13  = 11
100 mod 13  = 9

(50 * 100) mod 13 = ( (50 mod 13) * (100 mod 13) ) mod 13 
or (5000) mod 13 = ( 11 * 9 ) mod 13
or 8 = 8