Initialize this descriptor instance

        Parameters
        ----------
        cls : class
            The class which owns this descriptor
        name : str
            The attribute name of this descriptor

def init_self(self, cls, name):
        """Initialize this descriptor instance

        Parameters
        ----------
        cls : class
            The class which owns this descriptor
        name : str
            The attribute name of this descriptor
        """
        # the class the descriptor is defined on
        self.this_class = cls
        # the attribute name of this descriptor
        self.this_name = name