“类型错误：无法理解数据类型”比较 dtype np.datetime64

Question

as per this response , I'm comparing a subtype datetime64[ns, US/Central] to np.datetime64 :

        columns = self._obj.columns
        for dtype in self._obj.dtypes:
            print("testing:", dtype)
            if np.issubdtype(dtype, np.datetime64):
               ...

testing: datetime64[ns, US/Central]
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-6-2ddcb445a42c> in <module>
...
...(self, dataframe, *dataframes)
    147         for dtype in self._obj.dtypes:
    148             print("testing:", dtype)
--> 149             if np.issubdtype(dtype, np.datetime64):

...
TypeError: data type not understood

if run head() in this dataframe I get normal timestamps in that column:

ts
0   2020-02-22 12:11:40-06:00   NaN
1   2020-02-22 12:11:41-06:00   NaN

pandas. version '1.0.2'
numpy. version '1.18.1'
any ideas? thanks

Answer 1

not ideal, but I fixed this with string comparison:

if (str(dtype).startswith("datetime64")):
   ...