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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 execute_fields( self, parent_type: GraphQLObjectType, source_value: Any, path: Optional[ResponsePath], fields: Dict[str, List[FieldNode]], ) -> AwaitableOrValue[Dict[str, Any]]: """Execute the given fields concurrently. Implements the "Evaluating selection sets" section of the spec for "read" mode. """

        results = {}
        awaitable_fields: List[str] = []
        append_awaitable = awaitable_fields.append
        for response_name, field_nodes in fields.items():
            field_path = add_path(path, response_name)
            result = self.resolve_field(
                parent_type, source_value, field_nodes, field_path
            )
            if result is not INVALID:
                results[response_name] = result
                if isawaitable(result):
                    append_awaitable(response_name)

        #  If there are no coroutines, we can just return the object
        if not awaitable_fields:
            return results

        # Otherwise, results is a map from field name to the result of resolving that
        # field, which is possibly a coroutine object. Return a coroutine object that
        # will yield this same map, but with any coroutines awaited in parallel and
        # replaced with the values they yielded.
        async def get_results():
            results.update(
                zip(
                    awaitable_fields,
                    await gather(*(results[field] for field in awaitable_fields)),
                )
            )
            return results

        return get_results()