On 20Aug2020 18:13, Chris Green <c...@isbd.net> wrote: >Cameron Simpson <c...@cskk.id.au> wrote: >> On 19Aug2020 08:53, Chris Green <c...@isbd.net> wrote: >> >Maybe I should bite the bullet and make Python 3 the default Python >> >and see what falls over as a consequence. >> >> Don't change the system default Python - many system scripts rely on >> that and may break. If an OS update changes it, it should also update >> all the dependent scripts and so be ok, but an ad hoc change of only >> part of the system is asking for trouble. >> >It's actually more subtle and complicated than the OS changing or not >changing the default Python version. There are quite a lot of >questions about exactly this on the Ubuntu lists. All the OS python >code in Ubuntu 20.04 is now Python 3 but there are some other things >which I have installed (such as Mercurial) which still depend on >Python 2.
I run Mercurial 5.5 with Python 3. Admittedly because I went "pip3 install mercurial" to put it in my personal py 3 venv. However I recommend this anyway! Uninstall the system mercurial if you don't need it elsewhere - it will remove a python 2 dependency. >One can see what is affected by doing:- > > $ sudo apt remove python2 --simulate > >This shows a mixture of old (and no longer needed) libraries that >would go with Python 2 but it also shows some things like Mercurial >that I need. % which hg /Users/cameron/var/venv/3/bin/hg >So Python 2 stays for the moment. I recommend putting a little more work to further reducing your py 2 dependence - it will help in the medium term. Cheers, Cameron Simpson <c...@cskk.id.au> -- https://mail.python.org/mailman/listinfo/python-list
