根据年月日计算天数 ``` """ 获取年、月、日. 计算这是这一年的第几天. 算法：前几个月的总天数 + 当月天数 2019,5,18 31 28 31 30 + 18 """ year = int(input("请输入年：")) month = int(input("请输入月：")) day = int(input("请输入天：")) day_of_second = 29 if year % 4 == 0 and year % 100 != 0 or year % 400 == 0 else 28 days_of_month = (31, day_of_second, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31) # 累加前几个月的总天数 # total_days = 0 # for i in range( month -1 ):# 0 1 2 3 # total_days += days_of_month[i] total_days = sum(days_of_month[: month - 1]) # 累加当月天数 total_days += day print("这是一年的第"+str(total_days)+"天") ```