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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 check_runner(self):
 """Make sure there is a runner."""

        if os.getcwd() not in sys.path:
            sys.path.append(os.getcwd())
        if self.runner is None:
            self.runner = Runner(self.comp, exit=self.exit_runner, store=self.mypy)