Object Protocol

Note

If o1 and o2 are the same object, :cfunc:`PyObject_RichCompareBool` will always return 1 for Py_EQ and 0 for Py_NE.

Subclass determination is done in a fairly straightforward way, but includes a wrinkle that implementors of extensions to the class system may want to be aware of. If A and B are class objects, B is a subclass of A if it inherits from A either directly or indirectly. If either is not a class object, a more general mechanism is used to determine the class relationship of the two objects. When testing if B is a subclass of A, if A is B, :cfunc:`PyObject_IsSubclass` returns true. If A and B are different objects, B’s __bases__ attribute is searched in a depth-first fashion for A — the presence of the __bases__ attribute is considered sufficient for this determination.