datetime formatinda gelen tarihe gore burc ismi doner.

burc_bulucu.py

import datetime

def _find_horoscope(bday):
    if bday.month == 1 and bday.day >= 20 or bday.month == 2 and bday.day < 18:
        return 'kova'
    if bday.month == 2 and bday.day >= 18 or bday.month == 3 and bday.day < 20:
        return 'balik'
    if bday.month == 3 and bday.day >= 20 or bday.month == 4 and bday.day < 20:
        return 'koc'
    if bday.month == 4 and bday.day >= 20 or bday.month == 5 and bday.day < 21:
        return 'boga'
    if bday.month == 5 and bday.day >= 21 or bday.month == 6 and bday.day < 21:
        return 'ikizler'
    if bday.month == 6 and bday.day >= 21 or bday.month == 7 and bday.day < 22:
        return 'yengec'
    if bday.month == 7 and bday.day >= 22 or bday.month == 8 and bday.day < 23:
        return 'aslan'
    if bday.month == 8 and bday.day >= 23 or bday.month == 9 and bday.day < 23:
        return 'basak'
    if bday.month == 9 and bday.day >= 23 or bday.month == 10 and bday.day < 23:
        return 'terazi'
    if bday.month == 10 and bday.day >= 23 or bday.month == 11 and bday.day < 22:
        return 'akrep'
    if bday.month == 11 and bday.day >= 22 or bday.month == 12 and bday.day < 22:
        return 'yay'
    return 'oglak'

birthdate = datetime.date(1987, 07, 27) 
print _find_horoscope(birthdate)

a.k.a amelelik.py