Calculate the value of ‘a’ to the power ‘b’

Calculate the value of ‘a’ to the power ‘b’.

Test Data:

(power(3,4) -> 81

def power(a, b):
       if b == 0:
               return 1
       elif a == 0:
               return 0
       elif b == 1:
               return a
       else:
               return a * power(a, b - 1)

# test
print(power(3, 4))    # 81

See also

https://www.w3resource.com/python-exercises/data-structures-and-algorithms/python-recursion-exercise-10.php