(self, levels=1)
Pop the context of the given number of levels.

        Restrictions: after set-logic
Pop the context of the given number of levels.
Pop the context of the given number of levels .
def pop(self, levels=1):
        """ Pop the context of the given number of levels.

        Restrictions: after set-logic
        """
        raise NotImplementedError
def pop ( self , levels = 1 ) : raise NotImplementedError