asyncio: various fixes (#3947)

* asyncio: remove BaseChildWatcher from top level

* asyncio.sleep: loop is keyword-only

* asyncio: remove Server from top level

* asyncio: add FastChildWatcher to top level

* asyncio.constants: fix version availability

* asyncio: fix arg name for _wakeup

* asyncio: fix arg name for wrap_future

* asyncio.streams: add Optional to various arguments

It might be possible to further improve some of these with overloads.

* stubtest: fix whitelist

Co-authored-by: hauntsaninja <>

tests/stubtest_whitelists/py35.txt

@@ -3,9 +3,7 @@ asyncio.Future._exception
 asyncio.Future._loop
 asyncio.Future._tb_logger
 asyncio.Task.__init__
-asyncio.constants.DEBUG_STACK_DEPTH
-asyncio.constants.SENDFILE_FALLBACK_READBUFFER_SIZE
-asyncio.constants.SSL_HANDSHAKE_TIMEOUT
+asyncio.Task._wakeup
 asyncio.exceptions
 asyncio.futures.Future._callbacks
 asyncio.futures.Future._exception
@@ -15,6 +13,7 @@ asyncio.futures._TracebackLogger.__init__
 asyncio.protocols.BufferedProtocol
 asyncio.runners
 asyncio.tasks.Task.__init__
+asyncio.tasks.Task._wakeup
 asyncio.unix_events._UnixSelectorEventLoop.create_unix_server
 bdb.GENERATOR_AND_COROUTINE_FLAGS
 builtins.str.maketrans

tests/stubtest_whitelists/py36.txt

@@ -1,13 +1,9 @@
 asyncio.Future.__init__
-asyncio.Task._wakeup
-asyncio.constants.SENDFILE_FALLBACK_READBUFFER_SIZE
-asyncio.constants.SSL_HANDSHAKE_TIMEOUT
 asyncio.exceptions
 asyncio.futures.Future.__init__
 asyncio.futures._TracebackLogger.__init__
 asyncio.protocols.BufferedProtocol
 asyncio.runners
-asyncio.tasks.Task._wakeup
 asyncio.unix_events._UnixSelectorEventLoop.create_unix_server
 builtins.str.maketrans
 cmath.log

tests/stubtest_whitelists/py3_common.txt

@@ -14,39 +14,25 @@ abc.abstractstaticmethod
 aifc.open
 aifc.openfp
 argparse.Namespace.__getattr__
-asyncio.BaseChildWatcher
 asyncio.BaseEventLoop.subprocess_exec
 asyncio.Condition.acquire
 asyncio.Condition.locked
 asyncio.Condition.release
-asyncio.Server
-asyncio.StreamReaderProtocol.__init__
 asyncio.Task.get_stack
 asyncio.Task.print_stack
 asyncio.WriteTransport.set_write_buffer_limits
 asyncio.base_events.BaseEventLoop.subprocess_exec
-asyncio.futures.wrap_future
 asyncio.locks.Condition.acquire
 asyncio.locks.Condition.locked
 asyncio.locks.Condition.release
-asyncio.open_connection
-asyncio.open_unix_connection
 asyncio.proactor_events.BaseProactorEventLoop.sock_recv
 asyncio.selector_events.BaseSelectorEventLoop.sock_recv
-asyncio.sleep
-asyncio.start_unix_server
-asyncio.streams.StreamReaderProtocol.__init__
-asyncio.streams.open_connection
-asyncio.streams.open_unix_connection
-asyncio.streams.start_unix_server
 asyncio.tasks.Task.get_stack
 asyncio.tasks.Task.print_stack
-asyncio.tasks.sleep
 asyncio.transports.WriteTransport.set_write_buffer_limits
 asyncio.transports._FlowControlMixin.set_write_buffer_limits
 asyncio.windows_events
 asyncio.windows_utils
-asyncio.wrap_future
 base64.b32decode
 base64.b64decode
 base64.b64encode