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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 valid_meta(self, role):
 """ Return whether or not the meta file being read is valid. """

        if os.path.exists(self.paths["meta"]):
            self.meta_dict = utils.yaml_load(self.paths["meta"])
        else:
            self.report["state"]["missing_meta_role"] += 1
            self.report["roles"][role]["state"] = "missing_meta"

            return False

        is_valid = True

        # utils.yaml_load returns False when the file is invalid
        if isinstance(self.meta_dict, bool):
            is_valid = False
            sys.exit(1)

        return is_valid