Pandas.Series.dtype.kind is None for pd.interval

问题

Test code:

s = pd.Series(pd.array([pd.Interval(0,1.2), pd.Interval(5,123)]))
s.dtype
s.dtype.kind is None

>>> interval[float64]
>>> True

Is it some bug or made intentionally? If latter - for what reason?

回答1:

The reason this is appearing as None is simply because the implementation of IntervalDtype explicitly sets kind = None. This should probably be updated to 'O', though some care is needed here as it will result in unintended side effects, e.g. this would cause is_string_dtype to return True (see here).

来源：https://stackoverflow.com/questions/56384938/pandas-series-dtype-kind-is-none-for-pd-interval