On top of this old proposition:
https://bugs.python.org/issue13290
We could have a __vars__ method that would be called by vars() if defined.
The use cases:
1. let vars() work with instances without __dict__;
2. hide some attributes from the public API.
Example for 1:
class C:
__slots__ = 'eggs', 'spam'
def __vars__(self):
d = {}
for attr in self.__slots__:
if hasattr(self, attr):
d[attr] = getattr(self, attr)
return d
Exemple for 2:
class C:
def __vars__(self):
return {attr: value for attr, value in self.__dict__.items()
if not attr.startswith('_')}
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