How to use the xgcm.comodo.get_axis_positions_and_coords function in xgcm

REFERENCES
        ----------
        .. [1] Comodo Conventions https://web.archive.org/web/20160417032300/http://pycomodo.forge.imag.fr/norm.html
        """

        self._ds = ds
        self.name = axis_name
        self._periodic = periodic

        if coords:
            # use specified coords
            self.coords = {pos: name for pos, name in coords.items()}
        else:
            # fall back on comodo conventions
            self.coords = comodo.get_axis_positions_and_coords(ds, axis_name)

        # self.coords is a dictionary with the following structure
        #   key: position_name {'center' ,'left' ,'right', 'outer', 'inner'}
        #   value: name of the dimension

        # set default position shifts
        fallback_shifts = {
            "center": ("left", "right", "outer", "inner"),
            "left": ("center",),
            "right": ("center",),
            "outer": ("center",),
            "inner": ("center",),
        }
        self._default_shifts = {}
        for pos in self.coords:
            # use user-specified value if present