Python 带有datetime对象的列表的最后一个元素

我有两个datetime对象的“范围”，由开始日期和停止日期定义。 我想为前两个范围中的匹配天数创建一个新的“范围”（开始和停止日期）

下面是我尝试过的，但我对列表有问题：它似乎没有正确地获取最后一个元素

import datetime

#First date range is next week from monday to sunday:
next_week_day = datetime.datetime.now().date() + datetime.timedelta(days=7)
monday = next_week_day - datetime.timedelta(days=next_week_day.weekday())
sunday = monday + datetime.timedelta(days=7)

daterange = [monday + datetime.timedelta(days=x) for x in range(0, (sunday-monday).days)]
  
#Second daterange can be anything:
start = datetime.date(2020, 8, 2)
end = datetime.date(2020, 9, 25)
daterange_2 = [start + datetime.timedelta(days=x) for x in range(0, (end-start).days)]
  
#then I create a list to add matching days to create the new range
date_list = []
for date in daterange:
  for date_2 in daterange_2:
    if date_2 == date:
      date_list.append(date)

#and retrieve first and last day in list
first_date = date_list[0]
second_date = date_list[-1]

print(first_date, second_date)
print(type(first_date), type(second_date))

打印第二个日期的

'2020,9,24'

，而不是

'2020,9,25'

。

---

我遗漏了什么？

您需要更新

daterange

和

daterange\u 2

的范围，以包括所有必要的日期：

import datetime

# First date range is next week from monday to sunday:
next_week_day = datetime.datetime.now().date() + datetime.timedelta(days=7)
monday = next_week_day - datetime.timedelta(days=next_week_day.weekday())
sunday = monday + datetime.timedelta(days=7)

daterange = [monday + datetime.timedelta(days=x) for x in range(0, (sunday - monday).days + 1)]

# Second daterange can be anything:
start = datetime.date(2020, 8, 2)
end = datetime.date(2020, 9, 25)
daterange_2 = [start + datetime.timedelta(days=x) for x in range(0, (end - start).days + 1)]

# then I create a list to add matching days to create the new range
date_list = []
for date in daterange:
    for date_2 in daterange_2:
        if date_2 == date:
            date_list.append(date)

# and retrieve first and last day in list
first_date = date_list[0]
second_date = date_list[-1]

print(first_date, second_date)
print(type(first_date), type(second_date))

range（）

不包括结尾。Do

daterange_2=[start+datetime.timedelta（days=x）表示范围（0，（end-start.days+1）中的x]