Series of NumPy dtypes present in the DataFrame with index of column names.

        Returns
        -------
        Series

def dtypes(self):
        """Series of NumPy dtypes present in the DataFrame with index of column names.

        Returns
        -------
        Series

        """
        return Series(np.array(list(self._gather_dtypes().values()), dtype=np.bytes_),
                      self.keys())