How to change index dtype of pandas DataFrame to int32?

Question

A default dtype of DataFrame index is int64 and I would like to change it to int32.

I tried changing it with pd.DataFrame.set_index and Num

Answer 1

Not sure this is something worth doing in practice, but the following should work:

class Int32Index(pd.Int64Index):
    _default_dtype = np.int32

    @property
    def asi8(self):
        return self.values

i = Int32Index(np.array([...], dtype='int32'))

(from here)