python练习3：输入某年某月某日，判断这一天是这一年的第几天？

#输入某年某月某日，判断这一天是这一年的第几天？

list= [0,31,59,90,120,151,181,212,243,273,304,334]

year=int (input ('请输入年份：'))

month=int (input ('请输入月份：'))

day=int (input ('请输入天：'))

if month>0 and month<13:

    result=list[month-1]+day

    if year%4==0 and month>2:

        result=result+1

    print ("这是第%d天"%result)

elif (month<1 or month>12 or day<0 or day>31 or year<0 or (month==2 and year%4==0 and day>29) or (month==2 and year%4!=0 and day>28) or (month==4 or month==6 or month==9 or month==11 and day>30)):

    print ("date error!")

#输入某年某月某日，判断这一天是这一年的第几天？
list= [0,31,59,90,120,151,181,212,243,273,304,334]
year=int (input ('请输入年份：'))
month=int (input ('