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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def append_formula(self, formula, no_return=True):
 """ This method can be used to add a given list of clauses into the solver. :param formula: a list of clauses. :param no_return: check solver's internal formula and return the result, if set to ``False``. :type formula: iterable(iterable(int)) :type no_return: bool The ``no_return`` argument is set to ``True`` by default. :rtype: bool if ``no_return`` is set to ``False``. .. code-block:: python True """


        if self.solver:
            res = self.solver.append_formula(formula, no_return)
            if not no_return:
                return res