[Python-Dev] Pre- and post-conditions

Chris Barker chris.barker at noaa.gov
Wed Aug 15 12:34:56 EDT 2018

This is an appropriate topic for pyton-ideas:


not python-dev.

I'm sure you'll find interest in your idea there.


On Wed, Aug 15, 2018 at 1:25 AM, Marko Ristin-Kaufmann <
marko.ristin at gmail.com> wrote:

> Hi python devs,
> I would be very interested to bring design-by-contract into python 3. I
> looked at some of the packages I found on pypi and also we rolled our own
> solution (https://github.com/Parquery/icontract/). I also looked into
> https://www.python.org/dev/peps/pep-0316/.
> However, all these solutions seem quite clunky to me. The decorators
> involve an unnecessary computational overhead and the implementation of
> icontract became quite tricky once we wanted to get the default values of
> the decorated function.
> What do you think about the following solution as an extension to python
> compiler / interpreter?
> * We specify pre- and post-conditions in the docstring.
> * Python interpreter parses these conditions and adapts the corresponding
> byte codes at the begining and the end of the function body.
> I'm very grateful for any feedback on this!
> Marko
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Christopher Barker, Ph.D.

Emergency Response Division
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Chris.Barker at noaa.gov
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