bpo-33505: Optimize asyncio.ensure_future by reordering if conditions by jimmylai · Pull Request #6836 · python/cpython
If the argument is a Future, it is returned directly. """ if futures.isfuture(coro_or_future): if loop is not None and loop is not futures._get_loop(coro_or_future): raise ValueError('loop argument must agree with Future') return coro_or_future elif coroutines.iscoroutine(coro_or_future): if coroutines.iscoroutine(coro_or_future): if loop is None: loop = events.get_event_loop() task = loop.create_task(coro_or_future) if task._source_traceback: del task._source_traceback[-1] return task elif futures.isfuture(coro_or_future): if loop is not None and loop is not futures._get_loop(coro_or_future): raise ValueError('loop argument must agree with Future') return coro_or_future elif inspect.isawaitable(coro_or_future): return ensure_future(_wrap_awaitable(coro_or_future), loop=loop) else: