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Pkg iter_module for different versions of python


On 10/02/20 4:46 AM, J A wrote:
> as a sysadmin I've written several small tools as python command line apps
> that get installed with python setup.py install. I would now like to create
> another tool that would quickly list out all of my custom tools that may be
> installed on the system. so that others can get a quick menu of what
> commands are available. I believe I have a working app that uses the
> iter_modules function to list out all of the names and then I just filter
> based on names that I know to be mine.
> 
> My problem.. This works if everyone of my tools is only written in python 3
> or 2, but not both. Are there any tricks to getting iter_modules to return
> both python 3 and 2 installed modules?


Is the issue with iter_modules?

Remember that different Python versions are installed with separate 
libraries/paths. Accordingly, this lap-top's /usr/lib64 has both 
python2.7/ and python3.7/ sub-directories.

When an application is running under one* or the other, the sys.path 
changes accordingly (assuming the pkgutil.iter_modules(path=None) option).

(in case needed) Remember also that different installation methods may 
install packages in different directories anyway, eg personal 
installation or system-wide. So, even 'this' sys.path may not reveal 
what is present on 'this system'.

Might it be worth reversing the strategy and starting from a list of 
your modules, search likely portions of the directory-structure for 
'your stuff'?
(from a perspective of complete ignorance of the problem domain)

* requisite notice about not using deprecated Python2.n these days!
("Do as I say, but not as I do"? I suspect/hope that this system's 2.7 
is 'legacy' and no longer used for anything, including the OpSys)
-- 
Regards =dn