How to package a Python command line app?

[Loris Bennett]

Hi Manfred,

Manfred Lotz <ml_news at posteo.de> writes:

> The are many possibilities to package a Python app, and I have to admit
> I am pretty confused.
>
> Here is what I have:
>
> A Python command line app which requires some packages which are not in
> the standard library.
>
> I am on Linux and like to have an executable (perhaps a zip file with a
> shebang; whatever) which runs on different Linux systems.
>
> Different mean
> - perhaps different glibc versions
> - perhaps different Python versions
>
> In my specific case this is: 
> - RedHat 8.4 with Python 3.6.8
> - Ubuntu 20.04 LTS with Python 3.8.10 
> - and finally Fedora 33 with Python 3.9.9
>
>
> Is this possible to do? If yes which tool would I use for this?

I use poetry[1] on CentOS 7 to handle all the dependencies and create a
wheel which I then install to a custom directory with pip3.

You would checkout the repository with your code on the target system,
start a poetry shell using the Python version required, and then build
the wheel.  From outside the poetry shell you can set PYTHONUSERBASE and
then install with pip3.  You then just need to set PYTHONPATH
appropriately where ever you want to use your software.

Different Python versions shouldn't be a problem.  If some module
depends on a specific glibc version, then you might end up in standard
dependency-hell territory, but you can pin module versions of
dependencies in poetry, and you could also possibly use different
branches within your repository to handle that.

HTH

Loris   

Footnotes: 
[1]  https://python-poetry.org

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