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