python输入某年某月某日,判断这一天是这一年的第几天?答:if (year%4==0 and year%100!=0 ):return 1 elif(year%400==0):return 2 else:return 0 year_day=[31,28,31,30,31,30,31,31,30,31,30,31] #初始化平年月天数 leap_year=[31,29,31,30,31,30,31,31,30,31,30,31]#初始化闰年月天数 leap_year_f=[31,30,31,30,31,...