[Python-ideas] __dir__ in which folder is this py file

[Cody Piersall]

With PEP 562, the name __dir__ is off limits for this.

Cody

On Sun, May 6, 2018, 1:54 AM Yuval Greenfield <ubershmekel at gmail.com> wrote:

> Hi Ideas,
>
> I often need to reference a script's current directory. I end up writing:
>
> import os
> SRC_DIR = os.path.dirname(__file__)
>
>
> But I would prefer to have a new dunder for that. I propose: "__dir__".  I
> was wondering if others would find it convenient to include such a shortcut.
>
>
> Here are some examples of dirname(__file__) in prominent projects.
>
> https://github.com/tensorflow/models/search?l=Python&q=dirname&type=
> https://github.com/django/django/search?l=Python&q=dirname&type=
> https://github.com/nose-devs/nose/search?l=Python&q=dirname&type=
>
> Reasons not to add __dir__:
> * There already is one way to do it and it's clear and fairly short.
> * Avoid the bikeshed discussion of __dir__, __folder__, and other
> candidates.
>
> Reasons to add it:
> * os.path.dirname(__file__) returns the empty string when you're in the
> same directory as the script. Luckily, os.path.join understands an empty
> string as a ".", but this still is suboptimal for logging where it might be
> surprising to find the empty string. __dir__ could be implemented to
> contain a "." in that case.
> * I would save about 20 characters and a line from 50% of my python
> scripts.
> * This is such a common construct that everyone giving it their own name
> seems suboptimal for communicating. Common names include: here, path,
> dirname, module_dir.
>
> Cheers,
>
> Yuval Greenfield
>
> P.s. nodejs has it -
> https://nodejs.org/docs/latest/api/modules.html#modules_dirname also I
> apologize if this has been suggested before - my googling didn't find a
> previous thread.
>
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