def versioned_resolver(self):
        # type: () -> Any
        """
        select the resolver based on the version we are parsing
        """
        version = self.processing_version
        if version not in self._version_implicit_resolver:
            for x in implicit_resolvers:
                if version in x[0]:
                    self.add_version_implicit_resolver(version, x[1], x[2], x[3])
        return self._version_implicit_resolver[version]

        select the resolver based on the version we are parsing
        
dynaconf/vendor/ruamel/yaml/resolver.py