from __future__importannotationsimportinspect# a metaclass with an annotationclassMyMetaClass(type):metadata:dict[str,str]# dynamic class based on metaclassMyNewClass=MyMetaClass("MyNewClass", (object,), {"metadata": {}})# this seems new, but maybe intentional.   annotations are shown for the# dynamic class that come from the metaclass.  OK# 3.13.3: {}# 3.14.0a7: {}# 3.14.0b1: {'metadata': 'dict[str, str]'}print(inspect.get_annotations(MyNewClass))# declared class based on metaclass.   Add another anno to it.classMyOtherNewClass(metaclass=MyMetaClass):metadata:dict[str,str]= {}someint:int# both pythons look good and this agrees with older pythons too.# 3.13.3: {'metadata': 'dict[str, str]', 'someint': 'int'}# 3.14.0a7: {'metadata': 'dict[str, str]', 'someint': 'int'}# 3.14.0b1: {'metadata': 'dict[str, str]', 'someint': 'int'}print(inspect.get_annotations(MyOtherNewClass))# a control, a normal class without special metaclass.classYetAnotherClass:metadata:dict[str,str]= {}someint:int# here's where it goes wrong.   If we make new classes from these# bases that have *no* annotations, the *superclass annotations leak into the subclass*classMySubClass(MyNewClass):pass# 3.13.3: {}# 3.14.0a7: {}# 3.14.0b1: {'metadata': 'dict[str, str]', 'someint': 'int'}  # this has to be wrongprint(inspect.get_annotations(MySubClass))# if we add *any* annotations to MySubClass, the above annos *disappear*classMySubClass(MyNewClass):foobar:float# these look all correct.  but 3.14.0b1's seems to be inconsistent with itself# 3.13.3: {'foobar': 'float'}# 3.14.0a7: {'foobar': 'float'}# 3.14.0b1: {'foobar': 'float'}  # wait what?  What happened to metadata/someint from above?print(inspect.get_annotations(MySubClass))classMyOtherSubClass(MyOtherNewClass):pass# similar behaviors for declared class# 3.13.3: {}# 3.14.0a7: {}# 3.14.0b1: {'metadata': 'dict[str, str]', 'someint': 'int'}print(inspect.get_annotations(MyOtherSubClass))# behavior does not seem to occur at all without a metaclass.# YetAnotherClass has annotations but we do not see them from subclasses# of that classclassMyYetAnotherSubClass(YetAnotherClass):pass# 3.13.3: {}# 3.14.0a7: {}# 3.14.0b1: {}print(inspect.get_annotations(MyYetAnotherSubClass))

$ python test4.py    # python 3.13.3{}{'metadata': 'dict[str, str]', 'someint': 'int'}{}{'foobar': 'float'}{}{}$ ~/.venv314a7/bin/python test4.py   # python 3.14.0a7{}{'metadata': 'dict[str, str]', 'someint': 'int'}{}{'foobar': 'float'}{}{}$ ~/.venv314/bin/python test4.py   # python 3.14.0b1{'metadata': 'dict[str, str]'}{'metadata': 'dict[str, str]', 'someint': 'int'}{'metadata': 'dict[str, str]'}{'foobar': 'float'}{'metadata': 'dict[str, str]', 'someint': 'int'}{}