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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 _scrub_method_name(self, method_name):
 """Scrubs a method name, returning result from local cache if available. This method wraps fitparse.utils.scrub_method_name and memoizes results, as scrubbing a method name is expensive. Args: method_name: Method name to scrub. Returns: Scrubbed method name. """

        if method_name not in self._scrubbed_method_names:
            self._scrubbed_method_names[method_name] = (
                scrub_method_name(method_name))

        return self._scrubbed_method_names[method_name]