bpo-46417: Add _PyType_GetSubclasses() function #30761
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Add a new _PyType_GetSubclasses() function to get type's subclasses. _PyType_GetSubclasses(type) returns a list which holds strong refererences to subclasses. It is safer than iterating on type->tp_subclasses which yields weak references and can be modified during the iteration. _PyType_GetSubclasses(type) now holds a reference to tp_subclasses dict while creating the list of subclasses. set_collection_flag_recursive() of _abc.c now uses _PyType_GetSubclasses().
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Add a new _PyType_GetSubclasses() function to get type's subclasses.
_PyType_GetSubclasses(type) returns a list which holds strong
refererences to subclasses. It is safer than iterating on
type->tp_subclasses which yields weak references and can be modified
during the iteration.
_PyType_GetSubclasses(type) now holds a reference to tp_subclasses
dict while creating the list of subclasses.
set_collection_flag_recursive() of _abc.c now uses
_PyType_GetSubclasses().
https://bugs.python.org/issue46417