如何在 Python 中使用 datetime 从当前日期获取最近 90 天(3 个月)的星期日

问题描述

我正在尝试使用日期时间从 python 中的当前日期获取最近 90 天(星期日 3 个月星期日)的日期.我可以在周日获得最后 3 个月，但不能从当前日期开始.使用此代码，我将获得本月和过去 2 个月(共 3 个月)的星期日列表.

I am trying to get a date of last 90 days Sundays (3 months Sunday) from the current date in python using datetime. I am able to get last 3 months Sunday but not from current date. With this code i am getting list of Sunday from the current month and last 2 month (total 3 months).

from datetime import date, timedelta, datetime

def list_sunday(year, month, day):
  try:
    for i in range(1,4):
        d = date(year, month, day)
        d += timedelta(days = 6 -d.weekday())
        while d.month==month:
            yield d
            d += timedelta(days =+ 7)

        if month > 1:
            month = month - 1
        else:
            month = 12
            year = year - 1

        i+=1
  except Exception as e:
    log.error("XXX %s" % str(e))

for d in list_sunday(2019, 4, 05):
    print d

使用上面的代码，我得到了这个

With above code, i am getting this

2019-04-07
2019-04-14
2019-04-21
2019-04-28
2019-03-10
2019-03-17
2019-03-24
2019-03-31
2019-02-10
2019-02-17
2019-02-24

这就是我想要得到的，

2019-03-10
2019-03-17
2019-03-24
2019-03-31
2019-02-10
2019-02-17
2019-02-24
2019-01-06
2019-01-13
2019-01-20
2019-01-27

有人可以帮忙吗?

推荐答案

from datetime import date, timedelta
from pprint import pprint

def is_sunday(day):
    return day.weekday() == 6

def sundays_within_last_x_days(num_days = 90):
    result = []
    end_date = date.today()
    start_date = end_date - timedelta(days = num_days)

    while start_date <= end_date:
        if is_sunday(start_date):
            result.append(start_date)
        start_date += timedelta(days = 1)

    return result

if __name__ == "__main__":
    dates = sundays_within_last_x_days(30)
    pprint(dates)

资源

• Python DateTime, TimeDelta, Strftime(格式)举例
• datetime - 基本日期和时间类型
• pprint - 数据漂亮的打印机

• Python DateTime, TimeDelta, Strftime(Format) with Examples
• datetime - Basic date and time types
• pprint - Data pretty printer

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