On Sun, 6 Mar 2022 at 03:20, Inada Naoki <songofaca...@gmail.com> wrote: > In general, when reference is borrowed from a caller, the reference is > available during the API. > But merge_dict borrows reference of key/value from other dict, not caller. > [...] > Again, insertdict takes the reference. So _PyDict_FromKeys() **does** > INCREF before calling insertdict, when key/value is borrowed > reference. > https://github.com/python/cpython/blob/6927632492cbad86a250aa006c1847e03b03e70b/Objects/dictobject.c#L2287-L2290 > https://github.com/python/cpython/blob/6927632492cbad86a250aa006c1847e03b03e70b/Objects/dictobject.c#L2309-L2311 > > On the other hand, slow path uses PyIter_Next() which returns strong > reference. So no need to INCREF it.
Thank you Inada, these points make me things clear now. (PS: dictobject will change a lot in 3.11... sigh :D) -- https://mail.python.org/mailman/listinfo/python-list
