Python standard library: asyncio

Hello world

This hello world programs was slightly adapted from Python's documentation in order to show that the type of the object that is returned by async def is a coroutine object.

import asyncio

async def async_func():

      print('Hello…')
      await asyncio.sleep(1)
      print('…World')


co_routine = async_func()

print(type(co_routine))
#
#  <class 'coroutine'>

asyncio.run(co_routine)

Github repository about-Python, path: /standard-library/asyncio/hello-world.py

Members

`AbstractChildWatcher`	`asyncio.unix_events.AbstractChildWatcher` class
`AbstractEventLoop`	`asyncio.events.AbstractEventLoop` class
`AbstractEventLoopPolicy`	`asyncio.events.AbstractEventLoopPolicy` class
`AbstractServer`	`asyncio.events.AbstractServer` class
`__all__`	`tuple` object
`ALL_COMPLETED`	`str` object
`all_tasks()`	Function
`_all_tasks_compat()`	Function
`as_completed()`	Function
`BaseEventLoop`	`asyncio.base_events.BaseEventLoop` class
`base_events`	Module
`base_futures`	Module
`BaseProtocol`	`asyncio.protocols.BaseProtocol` class
`base_subprocess`	Module
`base_tasks`	Module
`BaseTransport`	`asyncio.transports.BaseTransport` class
`BoundedSemaphore`	`asyncio.locks.BoundedSemaphore` class
`BufferedProtocol`	`asyncio.protocols.BufferedProtocol` class
`__builtins__`	`dict` object
`__cached__`	`str` object
`CancelledError`	`asyncio.exceptions.CancelledError` class
`Condition`	`asyncio.locks.Condition` class
`constants`	Module
`coroutine()`	Function
`coroutines`	Module
`create_subprocess_exec()`	Function
`create_subprocess_shell()`	Function
`create_task()`	Function
`current_task()`	Function
`DatagramProtocol`	`asyncio.protocols.DatagramProtocol` class
`DatagramTransport`	`asyncio.transports.DatagramTransport` class
`DefaultEventLoopPolicy`	`asyncio.unix_events._UnixDefaultEventLoopPolicy` class
`__doc__`	`str` object
`ensure_future()`	Function
`_enter_task()`	Built-in function
`Event`	`asyncio.locks.Event` class
`events`	Module
`exceptions`	Module
`FastChildWatcher`	`asyncio.unix_events.FastChildWatcher` class
`__file__`	`str` object
`FIRST_COMPLETED`	`str` object
`FIRST_EXCEPTION`	`str` object
`format_helpers`	Module
`Future`	`_asyncio.Future` class
`futures`	Module
`gather()`	Function
`get_child_watcher()`	Function
`get_event_loop()`	Built-in function
`get_event_loop_policy()`	Function
`_get_running_loop()`	Built-in function
`get_running_loop()`	Built-in function
`Handle`	`asyncio.events.Handle` class
`IncompleteReadError`	`asyncio.exceptions.IncompleteReadError` class
`InvalidStateError`	`asyncio.exceptions.InvalidStateError` class
`iscoroutine()`	Function
`iscoroutinefunction()`	Function
`isfuture()`	Function
`_leave_task()`	Built-in function
`LifoQueue`	`asyncio.queues.LifoQueue` class
`LimitOverrunError`	`asyncio.exceptions.LimitOverrunError` class
`__loader__`	?
`Lock`	`asyncio.locks.Lock` class
`locks`	Module
`log`	Module
`MultiLoopChildWatcher`	`asyncio.unix_events.MultiLoopChildWatcher` class
`__name__`	`str` object
`new_event_loop()`	Function
`open_connection()`	Function
`open_unix_connection()`	Function
`__package__`	`str` object
`__path__`	`list` object
`PidfdChildWatcher`	`asyncio.unix_events.PidfdChildWatcher` class
`PriorityQueue`	`asyncio.queues.PriorityQueue` class
`Protocol`	`asyncio.protocols.Protocol` class
`protocols`	Module
`Queue`	`asyncio.queues.Queue` class
`QueueEmpty`	`asyncio.queues.QueueEmpty` class
`QueueFull`	`asyncio.queues.QueueFull` class
`queues`	Module
`ReadTransport`	`asyncio.transports.ReadTransport` class
`_register_task()`	Built-in function
`run()`	Function
`run_coroutine_threadsafe()`	Function
`runners`	Module
`SafeChildWatcher`	`asyncio.unix_events.SafeChildWatcher` class
`SelectorEventLoop`	`asyncio.unix_events._UnixSelectorEventLoop` class
`selector_events`	Module
`Semaphore`	`asyncio.locks.Semaphore` class
`SendfileNotAvailableError`	`asyncio.exceptions.SendfileNotAvailableError` class
`set_child_watcher()`	Function
`set_event_loop()`	Function
`set_event_loop_policy()`	Function
`_set_running_loop()`	Built-in function
`shield()`	Function
`sleep()`	Function
`__spec__`	?
`sslproto`	Module
`staggered`	Module
`start_server()`	Function
`start_unix_server()`	Function
`StreamReader`	`asyncio.streams.StreamReader` class
`StreamReaderProtocol`	`asyncio.streams.StreamReaderProtocol` class
`streams`	Module
`StreamWriter`	`asyncio.streams.StreamWriter` class
`subprocess`	Module
`SubprocessProtocol`	`asyncio.protocols.SubprocessProtocol` class
`SubprocessTransport`	`asyncio.transports.SubprocessTransport` class
`sys`	Module
`Task`	`_asyncio.Task` class
`tasks`	Module
`ThreadedChildWatcher`	`asyncio.unix_events.ThreadedChildWatcher` class
`threads`	Module
`TimeoutError`	`asyncio.exceptions.TimeoutError` class
`TimerHandle`	`asyncio.events.TimerHandle` class
`to_thread()`	Function
`Transport`	`asyncio.transports.Transport` class
`transports`	Module
`trsock`	Module
`unix_events`	Module
`_unregister_task()`	Built-in function
`wait()`	Function
`wait_for()`	Function
`wrap_future()`	Function
`WriteTransport`	`asyncio.transports.WriteTransport` class

Python standard library: asyncio

Hello world

Members

See also