如何使用 Python 中的日期时间从当前日期获取过去 90 天（3 个月）的星期日

Question

我正在尝试使用 datetime 从 python 中的当前日期获取最近 90 天星期日（星期日 3 个月）的日期。我能够在周日获得过去 3 个月的时间，但不能从当前日期开始。使用此代码，我获得了当月和过去 2 个月（总共 3 个月）的星期日列表。

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

通过上面的代码，我得到了这个

这就是我想要得到的，

有人可以帮忙吗？

Answer 1

这可能会根据您的草稿为您提供更好的方法。有关如何了解更多信息的更多信息。请关注下link

from datetime import date, timedelta

def all_sundays(year):
# January 1st of the given year
    dt = date(year, 1, 1)
# First Sunday of the given year       
    dt += timedelta(days = 6 - dt.weekday())  
    while dt.year == year:
        yield dt
        dt += timedelta(days = 7)

for s in all_sundays(2020):
print(s)

输出

2020-01-05
2020-01-12
2020-01-19
2020-01-26
2020-02-02

2020-12-06
2020-12-13
2020-12-20
2020-12-27

Answer 2

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

如何使用 Python 中的日期时间从当前日期获取过去 90 天（3 个月）的星期日

How to get Sundays of last 90 days (3 months) from current date using datetime in Python

python

datetime

calendar