06.05.18 09:53, Yuval Greenfield пише:
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.
* Additional burden on maintainers of import machinery. It is already
too complex, and __file__ is set in multiple places. Don't forgot about
third-party implementations.
See also issue33277: "Deprecate __loader__, __package__, __file__, and
__cached__ on modules" (https://bugs.python.org/issue33277).
* More complex user code, because you have to handle different cases:
- __file__ is set, but __dir__ is not set.
- __file__ and __dir__ are set, but are not consistent.
Reasons to add it:
Are you aware of importlib.resources?
https://docs.python.org/3.7/whatsnew/3.7.html#importlib-resources
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