python - 日期时间类型错误 : 'datetime.datetime' object has no attribute '__getitem__'

Question

我在这里做错了什么？

import datetime

someday = datetime.datetime(2014, 9, 23, 0, 0)

someday = datetime.datetime.strptime(someday[:10], '%Y-%m-%d')
print someday

错误:

TypeError: 'datetime.datetime' object has no attribute '__getitem__'

Answer 1

someday 是一个datetime对象，不支持切片。因此，执行 someday[:10] 会引发 TypeError。

在切片之前，您需要将 someday 转换为字符串:

someday = datetime.datetime.strptime(str(someday)[:10], '%Y-%m-%d')

演示:

>>> import datetime
>>> someday = datetime.datetime(2014, 9, 23, 0, 0)
>>>
>>> someday  # This is a datetime object
datetime.datetime(2014, 9, 23, 0, 0)
>>> someday[:10] # Does not support slicing
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'datetime.datetime' object has no attribute '__getitem__'
>>>
>>> str(someday) # This returns a string
'2014-09-23 00:00:00'
>>> str(someday)[:10] # Supports slicing
'2014-09-23'
>>>