On Tue, Sep 20, 2016 at 9:27 AM, Xavier Combelle
<xavier.combelle@gmail.com> wrote:
> I find the idea of tracking the dependencies in the script might be a
> good idea.
> However, magically downloading without warning the user is in my point
> of view for sure a bad idea.
> I would far prefer that pip could scan a script to know the dependencies.
> (A little bit like a requirements.txt but inside the script)
> A special comment or docstring would do the job. for example
>
> """
> pip_requirements:
>     - requests >0.0
>     - asyncio
> """"
>
> to run the script it would be at the first time a  two step process
> for example:
>
> python3 -m pip --script-dependencies [--user] my_script.py
> python3 my_script.py

How about this:

python3 -m pip install -r requirements.txt
python3 my_script.py

That already works, but the requirements have to be in a separate text
file, not in the .py file itself. If you want a docstring-based
solution, I'd piggy-back it on requirements.txt, and use the same
format (eg if the docstring starts "pip_requirements:", the rest of it
is a requirements.txt file). Downside: Docstrings can be easily parsed
and read *IF* you can successfully import the module. Which you can't,
if you still need all those dependencies. So there would have to be
some kind of import hook that crafts a dummy package with an infinite
number of dummy subpackages, to allow all forms of import to trivially
succeed - "import X", "import X.Y", "from X.Y import Z", etc. This may
well be more hassle than it's worth.

ChrisA
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