code: def state_push(self):
          "Save the state of the output functions, to be restored with state_pop."
          for of in self.output_fns:
              if hasattr(of,'state_push'):
                  of.state_push()
          super(PatternGenerator, self).state_push(f state_push(self):
          "Save the state of the output functions, to be restored with state_pop."
          for of in self.output_fns:
              if hasattr(of,'state_push'):
                  of.state_push()
          super(PatternGenerator, self).state_push()
docs: Save the state of the output functions, to be restored with state_pop.