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"""

== Raise base to the power of exponent using recursion ==

Input -->

Enter the base: 3

Enter the exponent: 4

Output -->

3 to the power of 4 is 81

Input -->

Enter the base: 2

Enter the exponent: 0

Output -->

2 to the power of 0 is 1

"""

def power(base: int, exponent: int) -> float:

"""

Calculate the power of a base raised to an exponent.

>>> power(3, 4)

>>> power(2, 0)

>>> all(power(base, exponent) == pow(base, exponent)

... for base in range(-10, 10) for exponent in range(10))

True

>>> power('a', 1)

'a'

>>> power('a', 2)

Traceback (most recent call last):

...

TypeError: can't multiply sequence by non-int of type 'str'

>>> power('a', 'b')

Traceback (most recent call last):

...

TypeError: unsupported operand type(s) for -: 'str' and 'int'

>>> power(2, -1)

Traceback (most recent call last):

...

RecursionError: maximum recursion depth exceeded

"""

return base * power(base, (exponent - 1)) if exponent else 1

if __name__ == "__main__":

from doctest import testmod

testmod()

print("Raise base to the power of exponent using recursion...")

base = int(input("Enter the base: ").strip())

exponent = int(input("Enter the exponent: ").strip())

result = power(base, abs(exponent))

if exponent < 0: # power() does not properly deal w/ negative exponents

result = 1 / result

print(f"{base} to the power of {exponent} is {result}")

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