pandas 中的 to_datetime() 返回分类类型而不是日期时间对象

Question

这是代码示例：

data.timestamp = pd.to_datetime(data.timestamp, infer_datetime_format = True, utc = True)

data.timestamp.dtype

CategoricalDtype(categories=['2016-01-10 06:00:00+00:00', '2016-01-10 07:00:00+00:00',
                  '2016-01-10 08:00:00+00:00', '2016-01-10 09:00:00+00:00',
                  '2016-01-10 10:00:00+00:00', '2016-01-10 11:00:00+00:00',
                  '2016-01-10 12:00:00+00:00', '2016-01-10 13:00:00+00:00',
                  '2016-01-10 14:00:00+00:00', '2016-01-10 15:00:00+00:00',
                  ...
                  '2016-12-31 13:00:00+00:00', '2016-12-31 14:00:00+00:00',
                  '2016-12-31 15:00:00+00:00', '2016-12-31 16:00:00+00:00',
                  '2016-12-31 17:00:00+00:00', '2016-12-31 18:00:00+00:00',
                  '2016-12-31 19:00:00+00:00', '2016-12-31 20:00:00+00:00',
                  '2016-12-31 21:00:00+00:00', '2016-12-31 23:00:00+00:00'],
                 ordered=False)

我该如何解决这个问题？

Answer 1

data.timestamp = pd.to_datetime(data.timestamp, infer_datetime_format = True, utc = True).astype('datetime64[ns]')

这有效。