Converts an integer (between 0 and 10,000) into its alphabetical form.

numeric_converter.py

#!/usr/bin/python

ONES = {1 : 'one', 2 : 'two', 3 : 'three', 4 : 'four', 5 : 'five', 
6 : 'six', 7 : 'seven', 8 : 'eight', 9 : 'nine'}
ODDS = {10 : 'ten', 11 : 'eleven', 12 : 'twelve', 13 : 'thirteen', 
14 : 'fourteen', 15 : 'fifteen', 16 : 'sixteen', 17 : 'seventeen', 
18 : 'eighteen', 19 : 'nineteen'}
TENS = {2 : 'twenty', 3 : 'thirty', 4 : 'forty', 5 : 'fifty', 
6 : 'sixty', 7 : 'seventy', 8 : 'eighty', 9 : 'ninety'}

def numeric_converter(num):
    '''
    A function that converts a (non-negative) integer into its 
    spoken-language form.
    '''
    if type(num) == int and 0 <= num < 10000 :
        if num == 0:
            return 'zero'
        else:
            fin = []
            if num / 1000:
                fin.append(ONES[num/1000])
                fin.append('thousand')
                num %= 1000
            if num / 100:
                fin.append(ONES[num/100])
                fin.append('hundred')
                num %= 100
            if num / 10:
                if num/10 == 1:
                    fin.append(ODDS[num])
                    num = 0
                else:
                    fin.append(TENS[num/10])
                    num %= 10
            if num:
                fin.append(ONES[num])
            return ' '.join(fin)
    else:
        return "The argument should be an integer \
        between 0 and 10,000!"

if __name__ == '__main__':
    for i in [0, 10, 1023, 2004, 2020, 2200, 2202, 2220]:
        print numeric_converter(i)