get zodiacal sign by DD-MM

zodiac.py

# from http://stackoverflow.com/questions/3274597/how-would-i-determine-zodiac-astrological-star-sign-from-a-birthday-in-python
from bisect import bisect
signs = [(1,20,"Cap"), (2,18,"Aqu"), (3,20,"Pis"), (4,20,"Ari"),
         (5,21,"Tau"), (6,21,"Gem"), (7,22,"Can"), (8,23,"Leo"),
         (9,23,"Vir"), (10,23,"Lib"), (11,22,"Sco"), (12,22,"Sag"),
         (12,31,"Cap")]
def zodiac_sign(m,d):
    return signs[bisect(signs,(m,d))][2]

assert zodiac_sign(3,9) == "Pis"
assert zodiac_sign(6,30) == "Can"