Re: [Qemu-devel] [PATCH] qmp: make qmp-shell work with python3

[Eduardo Habkost <ehabkost@redhat.com>]

On Thu, Jun 20, 2019 at 11:11:03AM +0200, Igor Mammedov wrote:
> On Wed, 19 Jun 2019 09:29:24 -0400
> Cleber Rosa <crosa@redhat.com> wrote:
> 
> > On Tue, Jun 18, 2019 at 10:29:31AM -0400, Igor Mammedov wrote:
> > > python3 doesn't have raw_input(), so qmp-shell breaks.
> > > Use input() instead and override it with raw_input()
> > > if running on python2.
> > > 
> > > Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> > > ---
> > >  scripts/qmp/qmp-shell | 6 +++++-
> > >  1 file changed, 5 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/scripts/qmp/qmp-shell b/scripts/qmp/qmp-shell
> > > index 7776c7b141..8c49b39afa 100755
> > > --- a/scripts/qmp/qmp-shell
> > > +++ b/scripts/qmp/qmp-shell
> > > @@ -308,7 +308,11 @@ class QMPShell(qmp.QEMUMonitorProtocol):
> > >          @return True if execution was ok, return False if disconnected.
> > >          """
> > >          try:
> > > -            cmdline = raw_input(prompt)
> > > +            try: # attempt to set Python2 override
> > > +               import __builtin__;
> > > +               getattr(__builtin__, 'raw_input', input)
> > > +            except ModuleNotFoundError: pass  
> > 
> > Something like:
> > 
> >    if sys.version_info[0] == 2:
> >        input = raw_input
> > 
> > Also does the job, and may be considered simpler and easier to read.
> 
> that causes scope issues on python3

Which issues?  It should work if you set it at the module top
level.  We had done this before in other scripts.  e.g.:

$ git grep -1 'range = xrange'
tests/qemu-iotests/044-if sys.version_info.major == 2:
tests/qemu-iotests/044:    range = xrange
tests/qemu-iotests/044-
--
tests/qemu-iotests/163-if sys.version_info.major == 2:
tests/qemu-iotests/163:    range = xrange
tests/qemu-iotests/163-


-- 
Eduardo