English numerals to integers (recursive function)

Background

This kata. In theory, "nine hundred ninety-nine thousand nine hundred and ninety-nine" returns 999999.

The Issue

The current error is no return. The type-comparison error and an infinite loop of printing "nine hundred ninety-nine" have also shown up.

Perhaps, more broadly, the issue is, being a noob, I made the function recursive. However, when it calls itself, it does not behave as expected. Assumption: faulty implementation of the base case (when the list has a length of two or one).

The Code

numbers = {'one':1,'two':2,'three':3,'four':4,'five':5,'six':6,'seven':7,'eight':8,'nine':9,'ten':10,'eleven':11,'twelve':12,'thirteen':13,'fourteen':14,'fifteen':15,'sixteen':16,'seventeen':17,'eighteen':18,'nineteen':19,'twenty':20,'thirty':30,'forty':40,'fifty':50,'sixty':60,'seventy':70,'eighty':80,'ninety':90,'eighty-six': 86, 'thirty-one': 31, 'forty-three': 43, 'forty-two': 42, 'fifty-eight': 58, 'sixty-seven': 67, 'thirty-two': 32, 'thirty-five': 35, 'seventy-nine': 79, 'thirty-four': 34, 'fifty-seven': 57, 'twenty-nine': 29, 'eighty-nine': 89, 'ninety-four': 94, 'seventy-eight': 78, 'ninety-one': 91, 'forty-one': 41, 'sixty-two': 62, 'twenty-eight': 28, 'eighty-eight': 88, 'seventy-seven': 77, 'forty-seven': 47, 'eighty-five': 85, 'eighty-three': 83, 'fifty-two': 52, 'eighty-two': 82, 'fifty-five': 55, 'twenty-seven': 27, 'seventy-four': 74, 'thirty-seven': 37, 'twenty-six': 26, 'sixty-six': 66, 'eighty-four': 84, 'sixty-four': 64, 'forty-eight': 48, 'fifty-four': 54, 'eighty-one': 81, 'thirty-three': 33, 'forty-four': 44, 'fifty-nine': 59, 'thirty-eight': 38, 'forty-six': 46, 'sixty-nine': 69, 'sixty-one': 61, 'sixty-three': 63, 'ninety-eight': 98, 'seventy-six': 76, 'seventy-one': 71, 'ninety-three': 93, 'fifty-three': 53, 'fifty-six': 56, 'seventy-five': 75, 'eighty-seven': 87, 'ninety-seven': 97, 'ninety-six': 96, 'ninety-nine': 99, 'twenty-one': 21, 'twenty-five': 25, 'ninety-five': 95, 'thirty-nine': 39, 'sixty-eight': 68, 'thirty-six': 36, 'twenty-four': 24, 'seventy-three': 73, 'seventy-two': 72, 'ninety-two': 92, 'twenty-three': 23, 'twenty-two': 22, 'forty-nine': 49, 'sixty-five': 65, 'fifty-one': 51, 'forty-five': 45}
powers = {'vigintitrillion': 1000000000000000000000000000000000000000000000000000000000000000000000000, 'septillion': 1000000000000000000000000, 'nonillion': 1000000000000000000000000000000, 'tredecillion': 1000000000000000000000000000000000000000000, 'vigintiquadrillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000, 'decillion': 1000000000000000000000000000000000, 'billion': 1000000000, 'duovigintillion': 1000000000000000000000000000000000000000000000000000000000000000000000, 'thousand': 1000, 'duodecillion': 1000000000000000000000000000000000000000, 'septemdecillion': 1000000000000000000000000000000000000000000000000000000, 'vigintinonillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 'octillion': 1000000000000000000000000000, 'quinvigintillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000000, 'octodecillion': 1000000000000000000000000000000000000000000000000000000000, 'novemdecillion': 1000000000000000000000000000000000000000000000000000000000000, 'trigintillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 'quindecillion': 1000000000000000000000000000000000000000000000000, 'duotrigintillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 'quattuordecillion': 1000000000000000000000000000000000000000000000, 'quadrillion': 1000000000000000, 'vigintiseptillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 'vigintillion': 1000000000000000000000000000000000000000000000000000000000000000, 'untrigintillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 'centillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 'undecillion': 1000000000000000000000000000000000000, 'vigintunillion': 1000000000000000000000000000000000000000000000000000000000000000000, 'million': 1000000, 'septvigintillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 'vigintisextillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000000000, 'vigintiduoillion': 1000000000000000000000000000000000000000000000000000000000000000000000, 'sextillion': 1000000000000000000000, 'octovigintillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 'nonvigintillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 'sexdecillion': 1000000000000000000000000000000000000000000000000000, 'vigintoctillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 'sexvigintillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000000000, 'trevigintillion': 1000000000000000000000000000000000000000000000000000000000000000000000000, 'unvigintillion': 1000000000000000000000000000000000000000000000000000000000000000000, 'hundred': 100, 'quattuorvigintillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000, 'quintillion': 1000000000000000000, 'googol': 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 'vigintiquintrillion': 1000000000000000000000000000000000000000000000000000000000000000000000000000000}

def parse_int(string):
    string=string.split()
    string=list(filter(("and").__ne__,string))
    length=len(string)
    string=" ".join(string)
    result=0

# BROADER SCENARIO 1: empty string
    if length==0:
        print("ERROR: you passed an empty string.")
        result=None

# BROADER SCENARIO 2: one-word string
    elif length==1:
        if string in numbers:
            result=numbers[string]
        elif string in powers:
            print("ERROR: string cannot start with a power.")
            result=None
        else:
            print("ERROR: unrecognised word—",string)
            result=None

# BROADER SCENARIO 3: standard string
    else:
        string=string.split()
        string[0]=numbers[string[0]]
        while len(string)!=1:
            if string[1] in powers:
                string[0]*=powers[string[1]]
                string.pop(1)
            elif string[1] in numbers:
                if len(string)==2:
                    string[0]+=numbers[string[1]]
                    string.pop(1)
                    result=string[0]
                else:
                    string[0]+=parse_int(" ".join(string[1:]))
                    result=string[0]
    return(result)
print(parse_int("nine hundred and ninety-nine thousand nine hundred and ninety-nine"))

The Output

Currently, the function returns nothing. It would be helpful if it returned the right integer. I will update frequently.