Re: [dpdk-dev] [PATCH 0/9] python2 deprecation notice

[Thomas Monjalon <thomas@monjalon.net>]

I vote for applying this patch series,
because it does not change what we have,
except printing a warning in case python3
is neither explicitly called, nor the default.

I consider it is a good step,
and I don't see the extra warning as a severe annoyance.


17/07/2020 18:24, Bruce Richardson:
> On Fri, Jul 17, 2020 at 08:06:23AM -0700, Stephen Hemminger wrote:
> > On Fri, 17 Jul 2020 13:42:09 +0100
> > Bruce Richardson <bruce.richardson@intel.com> wrote:
> > > I think we have covered a number of options, but I'm not sure we have
> > > converged on an agreed solution. Here are the options I would consider:
> > > 
> > > 0. Do nothing to the code, and just print deprecation notice in docs. This
> > >   will violate the previously documented plan, but won't break anything for
> > >   anyone.
> > > 1. Just add deprecation notice but leave shebang lines unchanged, meaning
> > >   lots of people see the notice but don't need to care since they just call
> > >   the script.
> > > 2. As #1, but check if python3 is available and only print deprecation
> > >   notice if not
> > > 3. Add deprecation notice, and change shebang lines to use python3. This
> > >   means that anyone who does not have python3 installed will see a breaking
> > >   change
> > > 4. Change shebangs to use python3 and detect at "make" build time if
> > >   python3 is available. If py3 is unavailable, adjust shebang and add
> > >   deprecation warning on "make install".
> > > 5. Use shell-hack above.
> > > 
> > > Any other options I'm missing?
> > > 
> > > For me, I think I can live with all options bar #1. Probably my top
> > > preference would be #4 or #2, with #0 and #4 next best thereafter.
> > > 
> > 
> > 6. Change shebangs to use python3 and don't bother detecting.
> >    Since distributions will have python3.
> > 
> 
> This was what our originally patch submission was to do, but it was pointed
> out that we said we would have deprecation notices in the scripts in 20.08
> and only remove fully in 20.11
> 
> > 7. Change shebangs and keep the python2 compat imports
> 
> This is pretty much the same as #3. The python2 compat imports etc. will be
> removed in 20.11 anyway, so we can ignore those I think.
> 
> > 
> > 8. Other alternative I have seen in code is to use
> >    try block in the import section:
> > 
> > try:
> >     # for Python2
> >     from Tkinter import *
> > except ImportError:
> >     # for Python3
> >     from tkinter import *
> > 
> > But supporting python2 for a longer time makes no sense.a
> 
> This is already done in DPDK. All scripts already support both python2 and
> python3 AFAIK. If any don't, it's a bug.
> 
> > 
> > I would go for #0 for 20.08 and full python3 in 20.11 (#3)
> > 
> 
> Full python3 in 20.11 is indeed the already agreed plan. All python2
> compatibility will be removed then.