Recursion

[ThomasL]

def power(base,exp):
    if(exp == 1):
        return(base)
    if(exp != 1):
        return(base*power(base,exp-1))
base = int(input("Enter base: "))
exp = int(input("Enter exponential value: "))
print("Result:",power(base, exp))

Above code has several problems:
- What if you enter a negative exponent?
- Exponent can be 0, result would be 1
So valid version of power() looks like:

def power(base, exponent):
    """ Return base to the power exponent. Works only for positive exponents"""
    if exponent == 0:
        return 1
    elif exponent > 0:
        return base * power(base, exponent - 1)
    else:
        raise ValueError("Exponent must be positve!")