#输入某年某月某日，判断这一天是这一年的第几天？
代码
"""判断天数"""
def num(year,month,date):
days=0
if year%4==0 and year%100!=0:
for iin range(0,month-1):
days=days+list1[i]
days=days+date
else:
for iin range(0,month-1):
days=days+list2[i]
days=days+date
return days
if __name__ =='__main__':
list1=[31,29,31,30,31,30,31,31,30,31,30,31]
list2=[31,28,31,30,31,30,31,31,30,31,30,31]
year=int(input('请输入年份:'))
month=int(input('请输入月份:'))
date=int(input('请输入日期:'))
days=num(year,month,date)
print('天数是：%d'%days)