On Fri Dec 9, 2022 at 22:04 +0000, Audrey Toskin wrote: > DNF modules let you install multiple different versions of Python 3, > and the `alternatives` tool lets you change which is the default > version invoked by `/usr/bin/python3`. This is not the case on any current Fedora release. AFAIK, only EL 8 manages /usr/bin/python3 with alternatives. In current releases, /usr/bin/python3 always points to the default system python interpreter even if you have other python interpreter packages on your system. > However, at least for *Enterprise Linux 8, it seems a lot of packages > were built assuming the distro's default Python 3.6, but at runtime > only invoke "Python 3", not 3.6 specifically. In EPEL, packages with /usr/bin/python3 shebangs are meant to be executed with python3.6. You are correct that this falls apart when the python3 alternative points to a different Python interpreter. This oversight has been fixed[1] so new package builds that are meant for python3.6 have /usr/bin/python3.6 interpreters. We have not rebuilt existing packages so they are still affected by this. Therefore, it is recommended to keep python3 as /usr/bin/python3.6. [1]: https://lists.fedoraproject.org/archives/list/epel-devel@xxxxxxxxxxxxxxxxxxxxxxx/thread/RE3PG72B5AX7NTACPDSBGOWCMN7I3OQJ/ > It seems that I still need Python 3.6 for most packages installed via > DNF on EL8, Correct. > So, the workaround to having both installed on my system at the same > time would be to edit the shebangs to include the minor version of > Python that each application requires. It'd be better to set the python3 alternative to python3.6 (alternatives --set python3 /usr/bin/python3.6). Local modifications like this are not recommended. They will be discarded on updates. -- Maxwell G (@gotmax23) Pronouns: He/Him/His _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
