Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #38872

Re: any chance for contracts and invariants in Python?

Show all headers | View raw

On Thu, Feb 14, 2013 at 10:03 AM, Philipp Hagemeister <phihag@phihag.de> wrote:
> So any implementation has to choose one of the following:
>
> 1. Ignore invariants and postconditions of inherited classes - defeats
> the purpose.
> 2. Only respect definitions in classes and methods in the original
> definition, which would be unpythonic
> 3. Only respect the "original" definitions, for some value of original.
> Simarily, this would break monkey patching.
> 4. Update all subclasses whenever something changes.
> 5. Traverse the entire class hierarchy for every method call.
>
> Which option should be picked?

#5, with the expectation that like assertions the entire machinery
would be turned off when the -O flag is passed, or perhaps even
requiring a special flag to enable in the first place.  Contracts and
invariants would only be used in development work, not in production
code.

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

any chance for contracts and invariants in Python? mrkafk@gmail.com - 2013-02-14 03:42 -0800
  Re: any chance for contracts and invariants in Python? Philipp Hagemeister <phihag@phihag.de> - 2013-02-14 18:03 +0100
  Re: any chance for contracts and invariants in Python? Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-14 11:05 -0700
  Re: any chance for contracts and invariants in Python? MRAB <python@mrabarnett.plus.com> - 2013-02-14 18:18 +0000
  Re: any chance for contracts and invariants in Python? Ethan Furman <ethan@stoneleaf.us> - 2013-02-14 10:33 -0800
  Re: any chance for contracts and invariants in Python? Mark Janssen <dreamingforward@gmail.com> - 2013-02-14 18:33 -0800

csiph-web