如何将列表中的日期与今天的日期进行比较？
How to compare a date from a list with todays date?
我正在尝试将日期列表与现在的日期和时间进行比较。
我从远程 SSH 命令中获取这个字符串（只是一个简单的例子）：
Mon Jun 15 16:52:18 2020,Mon Jun 15 16:52:35 2020,Mon Jun 15 16:52:29 2020 ...
现在的日期和时间：
now = datetime.now()
然后我将 now 的原始格式转换为与我的字符串相同的格式：
nowform = now.strftime("%a %b %d %H:%M:%S %Y")
输出正是我需要的：
Wed Jun 17 13:26:39 2020
但是现在出现了问题，我已经尝试将我的列表项的格式更改为日期时间项，正如您在此处看到的那样：
dates_1 = str(re.findall('(Mon.*|Sun.*|Tue.*|Wed.*|Thu.*|Fri.*|Sat.*|Sun.*)', output)).replace("\r", "").replace(" '", "'").replace("'", "").replace("[", "").replace("]", "")#.replace(",", ";").replace(" ; ", ";")
print(dates_1)
dateslist = dates_1.split(",")
dates_list = [dt.datetime.strptime(date, "%a %b %d %H:%M:%S %Y").date() for date in dateslist]
print (dates_list)
然后我尝试取差（天数）：
delta = nowform - dates_list
print(delta.days)
dates_list的输出就是这个
[datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 17), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 17), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 15), datetime.date(2020, 6, 13), datetime.date(2020, 6, 13), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 15), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 16), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 1), datetime.date(2020, 6, 1), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 8), datetime.date(2020, 6, 10), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 15), datetime.date(2020, 6, 11), datetime.date(2020, 4, 23), datetime.date(2020, 6, 15), datetime.date(2020, 6, 16), datetime.date(2020, 5, 21), datetime.date(2020, 6, 1), datetime.date(2020, 6, 17), datetime.date(2020, 6, 14), datetime.date(2020, 6, 16), datetime.date(2020, 6, 15), datetime.date(2020, 6, 16), datetime.date(2020, 6, 16), datetime.date(2020, 6, 16), datetime.date(2020, 5, 12), datetime.date(2020, 6, 16), datetime.date(2020, 6, 16), datetime.date(2020, 6, 16), datetime.date(2020, 6, 12), datetime.date(2020, 6, 16), datetime.date(2020, 6, 16), datetime.date(2020, 6, 16), datetime.date(2020, 6, 15), datetime.date(2020, 6, 16), datetime.date(2020, 6, 15), datetime.date(2020, 6, 16), datetime.date(2020, 6, 15), datetime.date(2020, 6, 16), datetime.date(2020, 6, 11), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2017, 8, 21), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 5, 23), datetime.date(2020, 6, 14), datetime.date(2020, 6, 15), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 15), datetime.date(2020, 6, 12), datetime.date(2020, 6, 14), datetime.date(2018, 9, 12), datetime.date(2019, 10, 21), datetime.date(2020, 1, 29), datetime.date(2020, 1, 29), datetime.date(2019, 8, 1), datetime.date(2019, 8, 20), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17)]
但是它返回了这个错误：
TypeError: unsupported operand type(s) for -: 'str' and 'list'
如果我更改了格式，我怎么可能无法比较所有这些值？
首先，您不能从字符串 nowform 中减去日期时间对象列表 dates_list。其次，您需要使用 datetime.date 或 datetime.datetime，而不是两者的混合。然后你可以计算 timedelta 例如
import datetime
# today's date:
now = datetime.datetime.now().date()
# simulating your dates_list:
dates_list = [datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15)]
deltas = [now-d for d in dates_list]
# deltas
# [datetime.timedelta(days=2),
# datetime.timedelta(days=2),
# datetime.timedelta(days=2)]
delta_days = [td.days for td in deltas]
# delta_days
# [2, 2, 2]
请注意 now 和 dates_list 具有相同的数据类型，即 datetime.date。如果你想使用 Python 列表，你还需要使用列表推导来获得你想要的输出。
我正在尝试将日期列表与现在的日期和时间进行比较。
我从远程 SSH 命令中获取这个字符串（只是一个简单的例子）：
Mon Jun 15 16:52:18 2020,Mon Jun 15 16:52:35 2020,Mon Jun 15 16:52:29 2020 ...
现在的日期和时间：
now = datetime.now()
然后我将 now 的原始格式转换为与我的字符串相同的格式：
nowform = now.strftime("%a %b %d %H:%M:%S %Y")
输出正是我需要的：
Wed Jun 17 13:26:39 2020
但是现在出现了问题，我已经尝试将我的列表项的格式更改为日期时间项，正如您在此处看到的那样：
dates_1 = str(re.findall('(Mon.*|Sun.*|Tue.*|Wed.*|Thu.*|Fri.*|Sat.*|Sun.*)', output)).replace("\r", "").replace(" '", "'").replace("'", "").replace("[", "").replace("]", "")#.replace(",", ";").replace(" ; ", ";")
print(dates_1)
dateslist = dates_1.split(",")
dates_list = [dt.datetime.strptime(date, "%a %b %d %H:%M:%S %Y").date() for date in dateslist]
print (dates_list)
然后我尝试取差（天数）：
delta = nowform - dates_list
print(delta.days)
dates_list的输出就是这个
[datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 17), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 17), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 15), datetime.date(2020, 6, 13), datetime.date(2020, 6, 13), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 15), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 16), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 1), datetime.date(2020, 6, 1), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 8), datetime.date(2020, 6, 10), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 15), datetime.date(2020, 6, 11), datetime.date(2020, 4, 23), datetime.date(2020, 6, 15), datetime.date(2020, 6, 16), datetime.date(2020, 5, 21), datetime.date(2020, 6, 1), datetime.date(2020, 6, 17), datetime.date(2020, 6, 14), datetime.date(2020, 6, 16), datetime.date(2020, 6, 15), datetime.date(2020, 6, 16), datetime.date(2020, 6, 16), datetime.date(2020, 6, 16), datetime.date(2020, 5, 12), datetime.date(2020, 6, 16), datetime.date(2020, 6, 16), datetime.date(2020, 6, 16), datetime.date(2020, 6, 12), datetime.date(2020, 6, 16), datetime.date(2020, 6, 16), datetime.date(2020, 6, 16), datetime.date(2020, 6, 15), datetime.date(2020, 6, 16), datetime.date(2020, 6, 15), datetime.date(2020, 6, 16), datetime.date(2020, 6, 15), datetime.date(2020, 6, 16), datetime.date(2020, 6, 11), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2017, 8, 21), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 5, 23), datetime.date(2020, 6, 14), datetime.date(2020, 6, 15), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 14), datetime.date(2020, 6, 15), datetime.date(2020, 6, 12), datetime.date(2020, 6, 14), datetime.date(2018, 9, 12), datetime.date(2019, 10, 21), datetime.date(2020, 1, 29), datetime.date(2020, 1, 29), datetime.date(2019, 8, 1), datetime.date(2019, 8, 20), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17), datetime.date(2020, 6, 17)]
但是它返回了这个错误：
TypeError: unsupported operand type(s) for -: 'str' and 'list'
如果我更改了格式，我怎么可能无法比较所有这些值？
首先，您不能从字符串 nowform 中减去日期时间对象列表 dates_list。其次，您需要使用 datetime.date 或 datetime.datetime，而不是两者的混合。然后你可以计算 timedelta 例如
import datetime
# today's date:
now = datetime.datetime.now().date()
# simulating your dates_list:
dates_list = [datetime.date(2020, 6, 15), datetime.date(2020, 6, 15), datetime.date(2020, 6, 15)]
deltas = [now-d for d in dates_list]
# deltas
# [datetime.timedelta(days=2),
# datetime.timedelta(days=2),
# datetime.timedelta(days=2)]
delta_days = [td.days for td in deltas]
# delta_days
# [2, 2, 2]
请注意 now 和 dates_list 具有相同的数据类型，即 datetime.date。如果你想使用 Python 列表，你还需要使用列表推导来获得你想要的输出。