def _set_channel_positions(self, pos, names):
        """Update channel locations in info

        Parameters
        ----------
        pos : array-like | np.ndarray, shape (n_points, 3)
            The channel positions to be set.
        names : list of str
            The names of the channels to be set.

        Notes
        -----
        .. versionadded:: 0.9.0
        """
        if len(pos) != len(names):
            raise ValueError('Number of channel positions not equal to '
                             'the number of names given.')
        pos = np.asarray(pos, dtype=np.float)
        if pos.shape[-1] != 3 or pos.ndim != 2:
            msg = ('Channel positions must have the shape (n_points, 3) '
                   'not %s.' % (pos.shape,))
            raise ValueError(msg)
        for name, p in zip(names, pos):
            if self.ch_names in name:
                idx = self.ch_names.index(name)
                self.info['chs'][idx]['loc'][:3] = p
            else:
                msg = ('%s was not found in the info. Cannot be updated.'
                       % name)
                raise ValueError(msg)
dataset/ETHPy150Open mne-tools/mne-python/mne/channels/channels.py/SetChannelsMixin._set_channel_positions/swapped operands of `in`