Jason R. Coombs <[email protected]> added the comment:
> `site.addsitedir` is called for every site-packages directory (whether
> global, within a venv, or at the user level), so my proposal above covers
> appending multiple segments.
Good point. I think you're assuming that only site dirs are appropriate for
packages that require arbitrary code execution. I think I'd like to break that
assumption and allow any location where packages can be installed (PYTHONPATH)
to install hooks. Consider this use-case:
draft $ mkdir pkgs
draft $ python3.5
-m pip download -d pkgs future_fstrings
Collecting future_fstrings
Using cached
https://files.pythonhosted.org/packages/36/25/070c2dc1fe1e51901df5875c495d6efbbf945a93a2ca40f47e5225302fb8/future_fstrings-0.4.5-py2.py3-none-any.whl
Saved ./pkgs/future_fstrings-0.4.5-py2.py3-none-any.whl
Collecting tokenize-rt; python_version < "3.6" (from future_fstrings)
Using cached
https://files.pythonhosted.org/packages/76/82/0e6a9dda45dd76be22d74211443e199a330ac7e428b8dbbc5d116651be03/tokenize_rt-2.1.0-py2.py3-none-any.whl
Saved ./pkgs/tokenize_rt-2.1.0-py2.py3-none-any.whl
Successfully downloaded future-fstrings tokenize-rt
draft $ cat > hello-fstrings.py
# coding:
future_fstrings
print(f'hello world')
draft $
PYTHONPATH=pkgs/future_fstrings-0.4.5-py2.py3-none-any.whl:pkgs/tokenize_rt-2.1.0-py2.py3-none-any.whl
python3.5 hello-fstrings.py
xonsh: subprocess mode: command not found:
PYTHONPATH=pkgs/future_fstrings-0.4.5-py2.py3-none-any.whl:pkgs/tokenize_rt-2.1.0-py2.py3-none-any.whl
draft $ env
PYTHONPATH=pkgs/future_fstrings-0.4.5-py2.py3-none-any.whl:pkgs/tokenize_rt-2.1.0-py2.py3-none-any.whl
python3.5 hello-fstrings.py
File "hello-fstrings.py", line 1
SyntaxError: encoding problem: future_fstrings
If future-fstrings were properly installed, its runtime hook is called and the
script can run:
draft $ python3.5 -m pip-run -q future-fstrings -- hello-fstrings.py
hello world
I'd like for a package like future-fstrings to be able to supply a hook that
can be executed on startup that can be honored even if the package isn't
installed in one of the site paths.
> Let's make a PEP.
I'd be delighted to help with the PEP.
----------
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<https://bugs.python.org/issue33944>
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