ordinals

# -*- coding: utf-8 -*-

# Filename      ordinal_numbers.py
# Author        xxx <xxx@xxx.xxx>
# First edited  13-01-2011 14:17
# Last edited   13-01-2011 14:30

import argparse

ordinals = {0:"th", 1:"st", 2:"nd", 3:"rd", 4:"th",
            5:"th", 6:"th", 7:"th", 8:"th", 9:"th"}

def get_ten_digit(n):
    return (n / 10) % 10

def get_one_digit(n):
    return n % 10

def convert_to_ordinal(n):
    negative = False
    if n < 0:
        n = abs(n)
        negative = True
    if get_ten_digit(n) == 1:
        if negative:
            return "%dth" % (-n)
        else:
            return "%dth" % n
    elif get_ten_digit(n) != 1:
        if negative:
            return "%d%s" % (-n, ordinals[get_one_digit(n)])
        else:
            return "%d%s" % (n, ordinals[get_one_digit(n)])

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('number', metavar='N', type=int, default=None,
            help='Set number to convert to ordinal')
    args = parser.parse_args()

    print convert_to_ordinal(args.number)

if __name__ == '__main__':
    main()