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gh-118761: Lazily import annotationlib in typing #132060

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Merged
JelleZijlstra merged 3 commits into from
Apr 4, 2025
Merged

gh-118761: Lazily import annotationlib in typing #132060

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e22f2e7
gh-118761: Lazily import annotationlib in typing
JelleZijlstra Apr 4, 2025
4ebbc3c
Merge remote-tracking branch 'upstream/main' into lazy-annolib
JelleZijlstra Apr 4, 2025
651785b
Simpler approach
JelleZijlstra Apr 4, 2025
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Simpler approach
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@JelleZijlstra
JelleZijlstra committed Apr 4, 2025
commit 651785bc02c23e9d230bdd34e22ceda06d3a112c
15 changes: 4 additions & 11 deletions Lib/typing.py
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Expand Up @@ -162,18 +162,11 @@
]

class _LazyAnnotationLib:
def __init__(self) -> None:
self._annolib = None

def __getattr__(self, attr):
if self._annolib is None:
import annotationlib

self._annolib = annotationlib

value = getattr(self._annolib, attr)
setattr(self, attr, value)
return value
global _lazy_annotationlib
import annotationlib
_lazy_annotationlib = annotationlib
return getattr(annotationlib, attr)

_lazy_annotationlib = _LazyAnnotationLib()
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