I'm not sure what's going on here, and it's probably not actually
enum-specific, but that's where I saw it.
If you create a plain class and have an attribute with an annotation,
you can see that:
>>> class Foo:
... spam: "ham" = 1
...
>>> Foo.__a
Foo.__abstractmethods__ Foo.__annotations__
>>> Foo.__annotations__
{'spam': 'ham'}
Note that __annotations__ shows up when tab-completing "__a".
Now consider an enumeration:
>>> from enum import Flag, auto
>>> class Bar(Flag):
... quux: "asdf" = auto()
...
>>> Bar.__
Bar.__abstractmethods__ Bar.__getattr__( Bar.__ne__(
Bar.__base__( Bar.__getattribute__( Bar.__new__(
Bar.__bases__ Bar.__getitem__( Bar.__prepare__(
Bar.__basicsize__ Bar.__gt__( Bar.__qualname__
Bar.__bool__( Bar.__hash__( Bar.__reduce__(
Bar.__call__( Bar.__init__( Bar.__reduce_ex__(
Bar.__class__( Bar.__init_subclass__( Bar.__repr__(
Bar.__contains__( Bar.__instancecheck__( Bar.__reversed__(
Bar.__delattr__( Bar.__itemsize__ Bar.__setattr__(
Bar.__dict__ Bar.__iter__( Bar.__sizeof__(
Bar.__dictoffset__ Bar.__le__( Bar.__str__(
Bar.__dir__( Bar.__len__( Bar.__subclasscheck__(
Bar.__doc__ Bar.__lt__( Bar.__subclasses__(
Bar.__eq__( Bar.__members__ Bar.__subclasshook__(
Bar.__flags__ Bar.__module__ Bar.__text_signature__
Bar.__format__( Bar.__mro__ Bar.__weakrefoffset__
Bar.__ge__( Bar.__name__
>>> Bar.__annotations__
{'quux': 'asdf'}
Double-tabbing "__" shows everything but, and double-tabbing "__ann"
has nothing... but the attribute is most definitely there.
Perhaps notable is dir():
>>> dir(Foo)
['__annotations__', '__class__', '__delattr__', '__dict__', '__dir__',
'__doc__', '__eq__', '__format__', '__ge__', '__getattribute__',
'__gt__', '__hash__', '__init__', '__init_subclass__', '__le__',
'__lt__', '__module__', '__ne__', '__new__', '__reduce__',
'__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__',
'__subclasshook__', '__weakref__', 'spam']
>>> dir(Bar)
['__class__', '__doc__', '__members__', '__module__', 'quux']
But that's not the whole story, since tab completing "Bar.__" will
still show "__class__" and "__init__" that aren't in dir().
Tested with the default REPL CPython 3.6, 3.7, 3.8, and 3.9. Tested
also in IDLE on 3.9 but tab completion of dunders behaves differently
there (it ONLY seems to want to tab complete __class__, for some
reason) so it's not comparable.
What's actually going on here?
ChrisA
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