python小练习

写一个程序，用于计算2016年9月23日是这一年的第几天？

def isLeap(year):
    #year=input("please enter year:")
    try:
        if year%4==0 and year%100!=0:
            return True
        elif year%400==0:
            return  True
        else:
            return False
    except:
        return 'your enter is not year!'

print isLeap(2016)

def daysss(year,month,date):
    m30=[4,6,7,9,11]
    m31=[1,3,5,8,10,12]
    days=0
    for i in range(1,month):
        if i in m30:
            days=days+30
        elif i in m31:
            days=days+31
        elif i==2 and isLeap(year):
            days=days+29
        elif i==2 or isLeap(year):
            days=days+28
        else:
            return "your enter is incorrect!"
    days=days+date
    print days
    return '%d-%d-%d is the %d days in %d year' %(year,month,date,days,year)

print daysss(2016,9,23)