code: def add_clause(self, clause, no_return=True):
          
  
          if self.solver:
              res = self.solver.add_clause(clause, no_return)
              if not no_return:
                  return res
docs: This method is used to add a single clause to the solver. An
              optional argument ``no_return`` controls whether or not to check
              the formula's satisfiability after adding the new clause.
  
              :param clause: an iterable over literals.
              :param no_return: check solver's internal formula and return the
                  result, if set to ``False``.
  
              :type clause: iterable(int)
              :type no_return: bool
  
              :rtype: bool if ``no_return`` is set to ``False``.
  
              Note that a clause can be either a ``list`` of integers or another
              iterable type over integers, e.g. ``tuple`` or ``set`` among
              others.
  
              A usage example is the following:
  
              .. code-block:: python
  
                  >>> s = Solver(bootstrap_with=[[-1, 2], [-1, -2]])
                  >>> s.add_clause([1], no_return=False)
                  False