系统 ：Windows 7 语言版本 ：Anaconda3-4.3.0.1-Windows-x86_64 编辑器 ：pycharm-community-2016.3.2 Python ：3.6.0

• 这个系列讲讲 Python 对时间及日期的操作
• 今天讲讲获取本周几的日期或者上周周几的日期
• 涉及模块： datetime

Part 1：实现功能1

1. 获取本周几的日期，例如获取本周周四的日期

Part 2：代码1

import datetime
def get_current_weekday(n):
    today_info = datetime.date.today()
    print("今天是：", today_info)
    today_n = today_info.weekday()
    day_n = today_info
    one_day = datetime.timedelta(days=1)
    if today_n < n:
        while day_n.weekday() != n:
            day_n += one_day
    else:
        while day_n.weekday() != n:
            day_n -= one_day
    return day_n
current_week_day = get_current_weekday(3)
print("本周周四是：", current_week_day)

代码截图

运行结果

实际情况

Part 3：实现功能2

1. 获取上周几的日期，例如获取上周3的日期

Part 4：代码2

import datetime
def get_last_wek_weekday(n):
    today_info = datetime.date.today()
    print("今天是：", today_info)
    one_day = datetime.timedelta(days=1)
    seven_day = datetime.timedelta(days=7)
    last_week_day = today_info - seven_day
    last_week_day_n = last_week_day.weekday()
    print("上周的今天是：", last_week_day)
    if last_week_day_n < n:
        while last_week_day.weekday() != n:
            last_week_day += one_day
    else:
        while last_week_day.weekday() != n:
            last_week_day -= one_day
    return last_week_day
last_week_day_2 = get_last_wek_weekday(2)
print("上周周三是：", last_week_day_2)

代码截图

运行结果

实际情况