Set if the type allows subclassing
PyNumberMethods do their own coercion
New members introduced by Python 2.2 exist
Objects support garbage collection (see objimp.h)
PyBufferProcs contains bf_getcharbuffer
Objects support nb_index in PyNumberMethods
PySequenceMethods and PyNumberMethods contain in-place operators
tp_iter is defined
tp_richcompare is defined
PySequenceMethods contains sq_contains
Objects support type attribute cache
Objects which are weakly referencable if their tp_weaklistoffset is >0
Set if the type object is dynamically allocated
Set if the type is ‘ready’ – fully initialized
Set while the type is being ‘readied’, to prevent recursive ready calls