def month_date_valid(month):
    if month > 0 and month <= 12: 
        return True
    else: 
        return false
def get_day_count(month, days):
    list1 = [1,3,5,7,8,10,11]
    list2 = [2,4,6,9,]
    count = 0 
    for i in range(1, month):
        if i in list1:
            count+31
        elif i in list2: 
            count+30 
    else: 
        count+= 28
    return count + days
    
list1 = [1,3,5,7,8,10,11]
list2 = [2,4,6,9,]
for i in range(1,13):
    if i in list1:
        for j in range(1, 30):
            answer = get_day_count(i,j)
            print((i, j), 'is', answer)
    elif i in list2:
        for j in range(1, 31): 
            answer = get_day_count(i, j)
            print((i, j), 'is', answer)
    else: 
        for j in range(1,29):
            answer = get_day_count(i, j)
            print((i, j), 'is', answer) 
def main():
    month = int(input('Enter the month of the year: '))
    day = int(input('Enter the day of the year: '))
    if month_date_valid(month):
        month = (get_day_count(month, day))
        return True 
    else: 
        print('Month in invalid, try again')

我哪里出错了，因为它是假设要求我输入月份和日期，看看月份和日期是否有效？我真的卡住了，需要帮助快。任何想法欢迎。