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Diffstat (limited to 'Lib/asyncio/base_events.py')
| -rw-r--r-- | Lib/asyncio/base_events.py | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py index dc0ca3f02b..75989a7641 100644 --- a/Lib/asyncio/base_events.py +++ b/Lib/asyncio/base_events.py @@ -741,6 +741,12 @@ class BaseEventLoop(events.AbstractEventLoop): executor.submit(func, *args), loop=self) def set_default_executor(self, executor): + if not isinstance(executor, concurrent.futures.ThreadPoolExecutor): + warnings.warn( + 'Using the default executor that is not an instance of ' + 'ThreadPoolExecutor is deprecated and will be prohibited ' + 'in Python 3.9', + DeprecationWarning, 2) self._default_executor = executor def _getaddrinfo_debug(self, host, port, family, type, proto, flags): |