datetime TypeError:'datetime.datetime'对象没有属性'__getitem__'

Question

我在这做错了什么？

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不支持切片的对象.所以,做someday[:10]一个提高TypeError.

someday在切片之前,您需要转换为字符串:

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'
>>>