[Python-Dev] [RFC] Removing pure Python implementation of OrderedDict

[Serhiy Storchaka]

05.09.17 11:38, INADA Naoki пише:
> ## Cons
> 
> * All Python 3.7 implementations should provide _collections.OrderedDict
>    PyPy has it already.  But I don't know about micropython.

Current C implementation of OrderedDict is not safe regarding using 
mutating dict methods (or dict C API) like dict.__setitem__ or 
PyDict_SetItem. Using them can cause hangs or segfaults. See issue24726 
and issue25410. I hope your implementation will solve these issues, but 
there may be others. While the C implementation still is not enough 
mature, we should allow users that encountered one of such issues to use 
pure Python implementation which is free from hangs and segfaults.