On 11.05.2016 23:57, Brett Cannon wrote:
On Wed, 11 May 2016 at 14:29 Nikolaus Rath <nikol...@rath.org
<mailto:nikol...@rath.org>> wrote:
On May 11 2016, Brett Cannon <br...@python.org
<mailto:br...@python.org>> wrote:
> This PEP proposes a protocol for classes which represent a file
system
> path to be able to provide a ``str`` or ``bytes`` representation.
[...]
As I said before, to me this seems like a lot of effort for a very
specific use-case.
Exactly. Especially when considering what else can be done to improve
the situation considerably.
So let me put forward two hypothetical scenarios to
better understand your position:
- A new module for URL handling is added to the standard library (or
urllib is suitably extended). There is a proposal to add a new
protocol that allows classes to provide a ``str`` or ``bytes``
representation of URLs.
- A new (third-party) library for natural language processing arises
that exposes a specific class for representing audio data. Existing
language processing code just uses bytes objects. To ease transition
and interoperability, it is proposed to add a new protocol for
classes
that represend audio data to provide a bytes representation.
You can even add the timedelta-to-seconds protocol that somebody thought
would be good idea:
https://mail.python.org/pipermail/python-dev/2016-April/144018.html
https://mail.python.org/pipermail/python-ideas/2016-May/040226.html
The generalization is straight-forward and a result of this discussion.
If it works and is a good idea for pathlib, then there's absolutely no
reason not to do this for the datetime lib and other rich-object libs.
Same goes the other way round. Question still is: is it a good idea?
Maybe, it will become a successful pattern. Maybe not.
Do you think you would you be in favor of adding these protocols to
the stdlib/languange reference as well?
Maybe for URLs, not for audio data (at least not in the stdlib;
community can do what they want).
If not, what's the crucial
difference to file system paths?
Nearly everyone uses file system paths on a regular basis, less so
than URLs but still a good amount of people. Very few people work with
audio data.
Amount of usage should be taken into account of course. However,
question remains if that suffices as a justification for the effort.
Best,
Sven
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