Special Attributes
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The implementation adds a few special read-only attributes to several
object types, where they are relevant:
`__dict__'
A dictionary or other mapping object used to store an object's
(writable) attributes.
`__methods__'
List of the methods of many built-in object types, e.g.,
`[].__methods__' yields `['append', 'count', 'index', 'insert',
'pop', 'remove', 'reverse', 'sort']'. This usually does not need
to be explicitly provided by the object.
`__members__'
Similar to `__methods__', but lists data attributes. This usually
does not need to be explicitly provided by the object.
`__class__'
The class to which a class instance belongs.
`__bases__'
The tuple of base classes of a class object.