Just in case this was somehow missed ----- Forwarded Message ----- > From: "Petr Viktorin" <pvikt...@redhat.com> > To: python-l...@redhat.com > Cc: python-ma...@redhat.com, devexp-l...@redhat.com, "Nick Coghlan" > <ncogh...@gmail.com>, > rhel-product-...@redhat.com, rhel-n...@redhat.com, "Jan Beran" > <jbe...@redhat.com>, os-devel-l...@redhat.com, > "Langdon White" <lang...@redhat.com> > Sent: Friday, May 20, 2016 12:46:11 PM > Subject: Tech talk summary: Future of Python in RHEL and Fedora > > Hello, > Miro Hrončok and I have recently given a tech talk on the future of > Python in RHEL and Fedora. If you didn't catch it, there's a recording > available at: https://bluejeans.com/s/9EnS/ > > If you don't have time to watch, but develop or maintain Python-based > software in RHEL, please take some time read this summary. > > This is the current plan of the python-maint team, based on various > discussions. Change requests are welcome. > > > ## RHEL ## > > The problems we're trying to solve are: > - Upstream support for Python 2.x will end in 2020. We do not have > resources to maintain Python 2 for the full RHEL 8 lifetime. > - We'd like to avoid locking us and customers to a single Python version > for the entire RHEL 8 lifetime. > - Some customers want several versions of Python installed at once. > > Our solution to these problems is to provide two (kinds of) Python > stacks in RHEL 8: > - System Python (/usr/bibexec/system-python), on which Red Hat-provided > software can depend, and which can be upgraded or modified as Red Hat > needs. This will be Python 3.5. > - Separately installed Pythons, provided by SCLs or containers (the > exact implementation should be determined as part of the modularization > effort). Several of these can be installed at once, and they will have > their own support lifetimes. The interpreters will be available at > /usr/bin/pythonX.Y > > Python-based software provided by Red Hat can either use System Python > (which will be Python 3), or separately installed Pythons (which can be > any version, but may be supported for a shorter time). > > If you maintain such software, please plan for this. Let us know if you > need any assistance or additional information. We at python-maint will > be happy to help (but you do need to ask). > > > ## Fedora ## > > In Fedora, a system-python is included since F24, but for a different > reason: to make cloud images as small as possible. > Fedora's system-python contains a subset of the standard library, with > some modules (like those needed for development) removed. The remaining > pieces are provided by python-libs. > Packages that care about minimizing their dependency footprint, and > don't need the excluded modules, can depend on system-python instead of > the full Python. > We're planning to start talking to DNF and cloud-init teams to switch to > system-python. > > > ## Python 3 ## > > Python 3.0 was released in 2008, and most active open-source projects > now either support it or are working on it. Python 3 brings a better > Unicode model (which, as Nick Coghlan put it, has unfortunately, "broken > many of the workarounds that had been put in place to deal with the > limitations of the old model"), and an ever-increasing list of new > features. Python 2 is legacy software on extended support. > > In Fedora, 44% of packages are ported. Many of the remaining 56% are > practically abandoned. > Based on somewhat hand-wavy estimates, 70% of packages that will be > needed in RHEL are ported. Many of the rest are Red Hat projects. > > Eventually, all Python software will need to be ported to Python 3. If > you maintain a project that hasn't started yet, it is best not to delay. > Resources and support are available: > - Lennart Regebro’s Supporting Python 3: http://python3porting.com > - RPM Porting Guide (for Fedora spec files): > http://python-rpm-porting.readthedocs.io/ > - We're also writing a "Conservative Porting Guide" for "laggard" > projects (hopefully including customers' in-house tools). The plan is to > release in the summer. > > Let us know if you have any questions, if you need any help porting to > Python 3, or if you see a bug in our plans! > > > -- > Petr Viktorin > >
-- Francesco Romani RedHat Engineering Virtualization R & D Phone: 8261328 IRC: fromani _______________________________________________ Devel mailing list Devel@ovirt.org http://lists.ovirt.org/mailman/listinfo/devel
