问题19项目Euler计算周日

import datetime

def count_sundays(start_year, end_year):
    count = 0
    for year in range(start_year, end_year + 1):
        for month in range(1, 13):
            # 获取每个月的第一天
            first_day = datetime.date(year, month, 1)
            # 判断第一天是否为星期日
            if first_day.weekday() == 6:
                count += 1
    return count

start_year = 1901
end_year = 2000
sundays_count = count_sundays(start_year, end_year)
print("在{}年到{}年期间，星期日落在每月的第一天的次数为：{}".format(start_year, end_year, sundays_count))