Python ValueError：时间数据''；与格式不匹配'；%Y-%m-%dT%H:%m:%S'；

当我运行代码时，我得到了前面的回溯错误——尽管我认为所有内容的格式都正确

这是回溯

File "/alien.py", line 267, in filter_ufo_by_year
return ufo_by_year(filter_sightings(filter_text))
File "/alien.py", line 96, in ufo_by_year
in groupby('shape', sightings).items()
File "/alien.py", line 95, in <dictcomp>
for shape, class_sightings
File "lib/python3.6/site-packages/toolz/recipes.py", line 24, in 
countby
return frequencies(map(key, seq))
File "lib/python3.6/site-packages/toolz/itertoolz.py", line 539, in 
frequencies
for item in seq:
File "/alien.py", line 32, in sighting_year
return dt.datetime.strptime(sighting['date_time'], 
TIMESTAMP_FORMAT).year
File 
"/python/3.6.5/_strptime.py", line 565, in _strptime_datetime
tt, fraction = _strptime(data_string, format)
File 
"/python3.6/_strptime.py", line 362, in _strptime
(data_string, format))
ValueError: time data '' does not match format '%Y-%m-%dT%H:%M:%S'

下面是“日期时间”的示例单元格的外观：2015-07-25T21:45:00

---

非常感谢您提供的任何帮助

您提供的字符串中没有时区：

>>> sample_datetime = "2015-07-25T21:45:00"
>>> obj = dt.datetime.strptime(sample_datetime, TIMESTAMP_FORMAT)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/mm92400/anaconda3/envs/py36/lib/python3.6/_strptime.py", line 565, in _strptime_datetime
    tt, fraction = _strptime(data_string, format)
  File "/Users/mm92400/anaconda3/envs/py36/lib/python3.6/_strptime.py", line 362, in _strptime
    (data_string, format))
ValueError: time data '2015-07-25T21:45:00' does not match format '%Y-%m-%dT%H:%M:%SZ'

---

谢谢你的回复。然而，我删除了“Z”字符，但我仍然收到相同的回溯…你确定所有的时间戳都有相同的格式吗？

>>> sample_datetime = "2015-07-25T21:45:00"
>>> obj = dt.datetime.strptime(sample_datetime, TIMESTAMP_FORMAT)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/mm92400/anaconda3/envs/py36/lib/python3.6/_strptime.py", line 565, in _strptime_datetime
    tt, fraction = _strptime(data_string, format)
  File "/Users/mm92400/anaconda3/envs/py36/lib/python3.6/_strptime.py", line 362, in _strptime
    (data_string, format))
ValueError: time data '2015-07-25T21:45:00' does not match format '%Y-%m-%dT%H:%M:%SZ'

obj = dt.datetime.strptime(sample_datetime, '%Y-%m-%dT%H:%M:%S')
>>> obj 
datetime.datetime(2015, 7, 25, 21, 45)