[Python] DataFrame.dtypes doesn't work after astype() in pandas [duplicate]

I've transformed OrderDate column from its existing object data type into a 'datetime64[ns]' with astype method.

But after dtypes() I saw it didn't work.

Why?

Thanks.

`df_raw.OrderDate.astype('datetime64[ns]'),

`astype done

df_raw.dtypes

dtypes not changed

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