def getNum(n): nums = ['zero','one','two','three','four','five','six','seven','eight','nine','ten', \ 'eleven','twelve','thriteen','fourteen','fifteen','sixteen','seventeen','eighteen','nineteen'] tens = [None, None,'twenty','thrity','fourty','fifty','sixty','seventy','eighty','ninety'] try: n = int(n) except ValueError: return 'NaN' if n < 0: return 'negitive ' + getNum(abs(n)) if n < 20: return nums[n] if n < 100: # and n >= 20 s = tens[n//10] if n % 10: s += ' ' + nums[n%10] return s if n < 1000: # and n >= 100 s = nums[n//100] + ' hundred' if n % 100: s += ' ' + getNum(n - (n//100)*100) return s if n < 1000000: # and n >= 1000 s = getNum(n//1000) + ' thousand' if n % 1000: s += ' ' + getNum(n - (n//1000)*1000) return s if n < 1000000000: # and n >= 1000000 s = getNum(n//1000000) + ' million' if n % 1000000: s += ' ' + getNum(n - (n//1000000)*1000000) return s if n < 1000000000000: # and n >= 1000000000 s = getNum(n//1000000000) + ' billion' if n % 1000000000: s += ' ' + getNum(n - (n//1000000000)*1000000000) return s if n < 1000000000000000: # and n >= 1000000000 s = getNum(n//1000000000000) + ' trillion' if n % 1000000000000: s += ' ' + getNum(n - (n//1000000000000)*1000000000000) return s else: return 'infinity' def __main__(): while True: i = raw_input("Enter a number or 'q' to quit: ") if i in ('q','quit','exit'): break print getNum(i) if __name__ == '__main__': __main__()