datetime.strptime（）用于将字符串转换为datetime对象，当使用 strptime（）时，必须指定正确的

datetime.strptime() is used for converting a string to a datetime object , when using strptime() you have to specify the correct format in which the date/time in the string exists .

在您的情况下，格式应为-'％Y-％m-％d ％H：％M：％S'。

In your case the format should be - '%Y-%m-%d %H:%M:%S' .

示例-

>>> test = '2015-08-12 13:07:32'
>>> import datetime
>>> datetime.datetime.strptime(test, '%Y-%m-%d %H:%M:%S')
datetime.datetime(2015, 8, 12, 13, 7, 32)

如果您真正想要的是日期时间作为a带有 AM / PM 的字符串，那么您需要使用 strftime（）将其转换回具有以下格式的字符串您希望在这种情况下，格式为-'％Y-％m-％d％I：％M：％S％p'。示例-

If what you really want is the date-time back as a string with the AM/PM , then you need to use strftime() to convert it back to string with the format you want, in this case the format would be - '%Y-%m-%d %I:%M:%S %p' . Example -

>>> datetime.datetime.strptime(test, '%Y-%m-%d %H:%M:%S').strftime('%Y-%m-%d %I:%M:%S %p')
'2015-08-12 01:07:32 PM'

datetime 对象内部不存储（也不必存储）AM / PM信息，因为可以从小时轻松计算

datetime objects internally do not store (and do not have to store) the AM/PM information, since that can be easily calculated from the hour.