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Tue Sep 5 14:00:55 EDT 2017 · https://mail.python.org/pipermail/python-dev/2017-September/149163.html

On 9/5/2017 10:40 AM, Guido van Rossum wrote:
> On Tue, Sep 5, 2017 at 5:58 AM, Simon Cross 
> <hodgestar+pythondev at gmail.com <mailto:hodgestar+pythondev at gmail.com>> 
> wrote:
> 
>     I thought the decision a few years ago was that all modules that
>     have a C library for performance reasons should also have a Python
>     version? Did this decision change at some point? (just curious).
> 
> It was never meant as a hard rule. IIRC the actual rule is more that 
> *if* you have both a C and a Python version they need to supply the same 
> API, *and* the naming should be e.g. _pickle (C) and pickle (Python), 
> *and* the Python version should automatically replace itself with the C 
> version when the latter exists (e.g. by putting an import * at the end 
> with a try/except around it).

*And* both versions should be tested in the test file ;-).

-- 
Terry Jan Reedy

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Showing content from https://mail.python.org/pipermail/python-dev/2017-September/149163.html below:

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