code: def _maybe_make_dimension(self, dimension):
      
      # For backwards compatibility the argument can be either a Dimension, a
      # string or a `units.UnitDescriptor`.
      if isinstance(dimension, Dimension):
        return dimension
      if isinstance(dimension, units.UnitDescriptor):
        return Dimension.from_unit_descriptor(dimension)
      if isinstance(dimension, str):
        return Dimension.from_string(dimension)
  
      raise TypeError('Cannot convert %s to a dimension', dimension)
docs: Return a `measurements.Dimension` instance.