code: def add_example(self, example):
          "Add an example to the list of examples, checking it first."
          self.check_example(example)
          self.examples.append(examplef add_example(self, example):
          "Add an example to the list of examples, checking it first."
          self.check_example(example)
          self.examples.append(example)
docs: Add an example to the list of examples, checking it first.