python - How to convert numbers to words without using num2word library?

Question

I need to turn numbers from 1 - 99 into words. This is what I got so far:

num2words1 = {1: 'One', 2: 'Two', 3: 'Three', 4: 'Four', 5: 'Five', 
            6: 'Six', 7: 'Seven', 8: 'Eight', 9: 'Nine', 10: 'Ten', 
            11: 'Eleven', 12: 'Twelve', 13: 'Thirteen', 14: 'Fourteen', 
            15: 'Fifteen', 16: 'Sixteen', 17: 'Seventeen', 18: 'Eighteen', 19: 'Nineteen'}
num2words2 = ['Twenty', 'Thirty', 'Forty', 'Fifty', 'Sixty', 'Seventy', 'Eighty', 'Ninety']

def number(Number):

    if (Number > 1) or (Number < 19):
        return (num2words1[Number])
    elif (Number > 20) or (Number < 99):
        return (num2words2[Number])
    else:
        print("Number Out Of Range")
        main()

def main():
    num = eval(input("Please enter a number between 0 and 99: "))
    number(num)
main()

Now, the BIGGEST problem that I have so far is that the if, elif and else statements DO NOT seem to work. Only the first if statement runs.

The second problem is creating the string version of the numbers from 20-99....

P.S. Yes, I know about the num2word library, but I am not allowed to use it.

Answer 1

You can make this much simpler by using one dictionary and a try/except clause like this:

num2words = {1: 'One', 2: 'Two', 3: 'Three', 4: 'Four', 5: 'Five', 
             6: 'Six', 7: 'Seven', 8: 'Eight', 9: 'Nine', 10: 'Ten', 
            11: 'Eleven', 12: 'Twelve', 13: 'Thirteen', 14: 'Fourteen', 
            15: 'Fifteen', 16: 'Sixteen', 17: 'Seventeen', 18: 'Eighteen', 
            19: 'Nineteen', 20: 'Twenty', 30: 'Thirty', 40: 'Forty', 
            50: 'Fifty', 60: 'Sixty', 70: 'Seventy', 80: 'Eighty', 
            90: 'Ninety', 0: 'Zero'}

>>> def n2w(n):
        try:
            print num2words[n]
        except KeyError:
            try:
                print num2words[n-n%10] + num2words[n%10].lower()
            except KeyError:
                print 'Number out of range'

>>> n2w(0)
Zero
>>> n2w(13)
Thirteen        
>>> n2w(91)
Ninetyone
>>> n2w(21)
Twentyone
>>> n2w(33)
Thirtythree