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Use singleton enum for "not set" sentinels (#41990)

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* Use singleton enum for "not set" sentinel

https://www.python.org/dev/peps/pep-0484/#support-for-singleton-types-in-unions

* Remove unused variable
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Ville Skyttä 2020-12-19 13:46:27 +02:00 • committed by GitHub
parent de04a1ed67
commit 317ed418dd
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11 changed files with 139 additions and 131 deletions
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homeassistant/loader.py
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@ -48,7 +48,7 @@ CUSTOM_WARNING = (
"cause stability problems, be sure to disable it if you "
"experience issues with Home Assistant."
)
_UNDEF = object()
_UNDEF = object() # Internal; not helpers.typing.UNDEFINED due to circular dependency
MAX_LOAD_CONCURRENTLY = 4