On Tuesday, 29 December 2020 22:55:03 GMT Neil Bothwick wrote:
> On Tue, 29 Dec 2020 23:16:11 +0100, n952162 wrote:
> > > So, I tried to do an emerge on @system.  I got another slot conflict!
> > > This time for mako, which I'd seen go by sometimes as a "package of
> > > interest".  It's only transgression: PYTHON_TARGET containing
> > > python3_7.
> > 
> > Note that both the "scheduled for merge" depender and the "installed"
> > depender both required the same version of mako, 1.1.1-r1.  The only
> > difference is the fact that one requirements specification has
> > python3-7, the other python3-8.  The same pkg, the same binaries. 
> > Something is wrong here.  Why is it not good enough to specify python3?
> 
> PYTHON_TARGET determines for which version(s) of Python a package
> installs its modules. The modules may be identical, but 3.7 and 3.8 have
> different search paths, e.g. /usr/lib/python3.7/site-packages vs.
> /usr/lib/python3.8/site-packages.
> 
> It is possible you have some old python_targets settings in package.use,
> that's where I would check first.

As discussed recently, removing any manually configured python targets and 
letting portage work its magic, rather than fighting against it, is usually a 
sound way to get out of such a muddle.

I sync'ed portage a few hours ago today.  Neither mako, nor setuptools require 
anything other than python3_8 on this system:

$ eix -l setuptools
[I] dev-python/setuptools
     Available versions:  
            46.4.0-r3 ^t	[test PYTHON_TARGETS="pypy3 python2_7 
python3_6 python3_7 python3_8 python3_9"]	["|| ( python_targets_pypy3 
python_targets_python2_7 python_targets_python3_6 python_targets_python3_7 
python_targets_python3_8 python_targets_python3_9 )"]
            50.3.0    ^t	[test PYTHON_TARGETS="pypy3 python3_6 
python3_7 python3_8 python3_9"]	["|| ( python_targets_pypy3 
python_targets_python3_6 python_targets_python3_7 python_targets_python3_8 
python_targets_python3_9 )"]
       ~    51.0.0    ^t	[test PYTHON_TARGETS="pypy3 python3_6 
python3_7 python3_8 python3_9"]	["|| ( python_targets_pypy3 
python_targets_python3_6 python_targets_python3_7 python_targets_python3_8 
python_targets_python3_9 )"]
       ~    51.1.0    ^t	[test PYTHON_TARGETS="pypy3 python3_6 
python3_7 python3_8 python3_9"]	["|| ( python_targets_pypy3 
python_targets_python3_6 python_targets_python3_7 python_targets_python3_8 
python_targets_python3_9 )"]
     Installed versions:  50.3.0^t(12:47:38 05/12/20)(-test 
PYTHON_TARGETS="python3_8 -pypy3 -python3_6 -python3_7 -python3_9")
     Homepage:            https://github.com/pypa/setuptools https://pypi.org/
project/setuptools/
     Description:         Collection of extensions to Distutils


$ eix -l mako
[I] dev-python/mako
     Available versions:  
            1.1.3-r1  ^t	[doc test PYTHON_TARGETS="pypy3 python3_6 
python3_7 python3_8 python3_9"]	["|| ( python_targets_pypy3 
python_targets_python3_6 python_targets_python3_7 python_targets_python3_8 
python_targets_python3_9 )"]
     Installed versions:  1.1.3-r1^t(13:09:34 05/12/20)(-doc -test 
PYTHON_TARGETS="python3_8 -pypy3 -python3_6 -python3_7 -python3_9")
     Homepage:            https://www.makotemplates.org/ https://pypi.org/
project/Mako/
     Description:         A Python templating language

I expect in a few weeks the tree will settle on python3_9, so all this rinse 
and repeat exercise with all the python updates should hopefully go quiet. :-)