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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 allowed_methods(self, path_info=None):
 """Returns the valid methods that match for a given path. .. versionadded:: 0.7 """

        try:
            self.match(path_info, method="--")
        except MethodNotAllowed as e:
            return e.valid_methods
        except HTTPException:
            pass
        return []