如何计算当月的星期天？

import datetime

def calculate_sundays():
    # 获取当前日期和月份
    today = datetime.date.today()
    year = today.year
    month = today.month

    # 获取当月的第一天的日期
    first_day = datetime.date(year, month, 1)

    # 判断第一天是星期几
    first_day_weekday = first_day.weekday()

    # 计算当月的总天数
    if month == 12:
        total_days = (datetime.date(year + 1, 1, 1) - first_day).days
    else:
        total_days = (datetime.date(year, month + 1, 1) - first_day).days

    # 使用循环遍历每一天，判断是否为星期天
    sundays = []
    for i in range(total_days):
        current_day = first_day + datetime.timedelta(days=i)
        if current_day.weekday() == 6:
            sundays.append(current_day)

    return sundays

sundays = calculate_sundays()
for sunday in sundays:
    print(sunday)