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Set the event loop policy on Windows #65

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Set the event loop policy on Windows #65

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2c920e3
set the event loop policy on Windows
maximlt Oct 3, 2022
05410ef
check for tornado
maximlt Oct 3, 2022
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22 changes: 22 additions & 0 deletions nbsmoke/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@
import os
import io
import contextlib
import sys

import param

Expand Down Expand Up @@ -91,6 +92,27 @@ def cwd(d):
os.chdir(orig)


def fixup_windows_event_loop_policy() -> None:
try:
import tornado
except ImportError:
tornado = None
if not tornado:
return
# This part of the code comes from Bokeh's source code.
if (
sys.platform == 'win32'
and sys.version_info[:3] >= (3, 8, 0)
and tornado.version_info < (6, 1)
):
import asyncio
if type(asyncio.get_event_loop_policy()) is asyncio.WindowsProactorEventLoopPolicy:
# WindowsProactorEventLoopPolicy is not compatible with tornado 6
# fallback to the pre-3.8 default of WindowsSelectorEventLoopPolicy
asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())


fixup_windows_event_loop_policy()

###################################################

Expand Down