题目要求

输入格式为YYYYMMDD的字符串日期，计算并返回这一天是这一年的第几天，需完善给定的Python函数代码。

函数规范

• 函数名：getDays
• 参数：year，字符串类型，格式如"20211201"
• 返回值：整数，表示第几天

待完善代码

def getDays(year):
    s = 0
    y = int(year[:4])
    m = int(year[4:6])
    d = int(year[6:8])
    monthdays = (31,28,31,30,31,30,31,31,30,31,30,31)
    for i in range(  ①  ):
        s = s +    ②      
    if (y % 4 ==0 and y % 100 !=0 or y % 400 ==0) and   ③  :
        s = s + 1
    s = s + d
    return s

year = "20211201"
theday =   ④  
print(theday)