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bpo-39529: Deprecate creating new event loop in asyncio.get_event_loop() (GH-23554)

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asyncio.get_event_loop() emits now a deprecation warning when it creates a new event loop.
In future releases it will became an alias of asyncio.get_running_loop().
This commit is contained in:
Serhiy Storchaka 2021-04-25 13:40:44 +03:00 • committed by GitHub
parent face87c94e
commit 172c0f2752
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16 changed files with 570 additions and 185 deletions
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11
Lib/asyncio/events.py
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@ -759,9 +759,16 @@ def get_event_loop():
the result of `get_event_loop_policy().get_event_loop()` call.
"""
# NOTE: this function is implemented in C (see _asynciomodule.c)
return _py__get_event_loop()
def _get_event_loop(stacklevel=3):
current_loop = _get_running_loop()
if current_loop is not None:
return current_loop
import warnings
warnings.warn('There is no current event loop',
DeprecationWarning, stacklevel=stacklevel)
return get_event_loop_policy().get_event_loop()
@ -791,6 +798,7 @@ _py__get_running_loop = _get_running_loop
_py__set_running_loop = _set_running_loop
_py_get_running_loop = get_running_loop
_py_get_event_loop = get_event_loop
_py__get_event_loop = _get_event_loop
try:
@ -798,7 +806,7 @@ try:
# functions in asyncio. Pure Python implementation is
# about 4 times slower than C-accelerated.
from _asyncio import (_get_running_loop, _set_running_loop,
get_running_loop, get_event_loop)
get_running_loop, get_event_loop, _get_event_loop)
except ImportError:
pass
else:
@ -807,3 +815,4 @@ else:
_c__set_running_loop = _set_running_loop
_c_get_running_loop = get_running_loop
_c_get_event_loop = get_event_loop
_c__get_event_loop = _get_event_loop