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bpo-43901: Lazy-create an empty annotations dict in all unannotated user classes and modules (#25623)

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Change class and module objects to lazy-create empty annotations dicts on demand.  The annotations dicts are stored in the object's `__dict__` for backwards compatibility.
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larryhastings 2021-04-29 20:09:08 -07:00 • committed by GitHub
parent dbe60ee09d
commit 2f2b69855d
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9 changed files with 308 additions and 8 deletions
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Lib/typing.py
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@ -1677,6 +1677,8 @@ def get_type_hints(obj, globalns=None, localns=None, include_extras=False):
else:
base_globals = globalns
ann = base.__dict__.get('__annotations__', {})
if isinstance(ann, types.GetSetDescriptorType):
ann = {}
base_locals = dict(vars(base)) if localns is None else localns
if localns is None and globalns is None:
# This is surprising, but required. Before Python 3.10,