python3.9 failing?

[Marco Atzeri]

On 23.12.2021 06:50, Russell VT wrote:
> On Tue, Dec 21, 2021 at 6:34 AM Achim Gratz <Stromeko@nexgo.de> wrote:
> 
>> Marco Atzeri writes:
>>> Without Python 3.9  installed python3 should link by default to the
>>> next in the line (likely 3.8)
>>
>> While python3 still defaults to python38 alternatives should probably
>> prioritize 38 over 39?
> 
> 
> That's how I "fixed" mercurial on my own installation, as it was
> complaining about missing the "parsers" module, from inside the Python 3.9
> libraries, IIRC.
> 

Thanks for the report.
It is caused by:


$ head /usr/bin/hg -n 20
#!/usr/bin/python3
                  ^^ default 3.9
....

libdir = '../lib/python3.8/site-packages'
                        ^^ but really need 3.8
...


No surprise is not working.

A simple workaround is:


$ cp /usr/bin/hg /usr/local/bin/

$ sed -i -e "1 s/python3$/python3.8/" /usr/local/bin/hg

$ hg --version
Mercurial Distributed SCM (version 6.0)
(see https://mercurial-scm.org for more information)

...

Regards
Marco