时间分析器不会单独运行，但所有toget都不会

Question

所以我试图制作一个时间解析器，将3次时间格式中的1次转换为dd-mm-yy(28-sept-20。

这三者单独工作都很好，但当它们结合在一起时就不起作用了。

from datetime import datetime
def time_parser(self, time):
try:
start_period_obj = datetime.strptime(time, "%Y-%m-%dT%H:%M:%S.%fZ")
print('variation 1 is what was used')
except:
start_period_obj = datetime.strptime(time, "%Y-%m-%dT%H:%M:%SZ")
print('variation 2 is what was used')
else:
start_period = time.split('T')[0]
start_period_obj = datetime.strptime(time, "%Y-%m-%d")
print('variation 3 is what was used')
finally:
start_period = time.split('T')[0]
start_period_obj = datetime.strptime(time, "%Y-%m-%d")
print('variation 4 is what was used')
new_format = start_period_obj.strftime("%d-%b-%y")
print('The start date is')
print(new_format)
return new_format
#the time formats
start_time1 = "2020-08-28T13:42:00.298363-05:00"
start_time2 = "2020-09-03T16:33:47.289147Z"
start_time3 = "2020-09-01T00:00:00-05:00"
start_time4 = "2020-09-03T16:33:47Z"

time_parser(start_time1)

输出为

Traceback (most recent call last):
File "time conveter.py", line 33, in <module>
time_parser(start_time1)
TypeError: time_parser() missing 1 required positional argument: 'time'

我想要的输出是

dd-mm-yy

请帮助

Answer 1

首先，如果将self传递给函数，这通常意味着它是一个类方法，self是类实例。在这里，情况似乎并非如此。您之所以会出现错误，是因为您只向函数传递了一个参数，即self和time。如果您想在类之外使用函数，请删除self。

此外，如果您想测试不同的格式来解析时间字符串，最好将它们包装在try/except中运行的循环中，例如，如图所示。

最后，如果这些都是你遇到的时间字符串格式，你可以用fromisoformat(docs(：很好地解析它们

from datetime import datetime
fmts = ("2020-08-28T13:42:00.298363-05:00",
"2020-09-03T16:33:47.289147Z",
"2020-09-01T00:00:00-05:00",
"2020-09-03T16:33:47Z")
for f in fmts:
print(datetime.fromisoformat(f.replace('Z', '+00:00'))) # account for Z=zulu=UTC

# 2020-08-28 13:42:00.298363-05:00
# 2020-09-03 16:33:47.289147+00:00
# 2020-09-01 00:00:00-05:00
# 2020-09-03 16:33:47+00:00

Answer 2

所以我结合了你的一些回复，得到了这个。到目前为止，它还可以转换任何时间格式。

def time_parser(time):
start_period = time.split('T')[0]
start_period_obj = datetime.strptime(start_period, "%Y-%m-%d")
new_format = start_period_obj.strftime("%d-%b-%y")
print('The converted date is')
print(new_format)
print("_______________________")
return new_format