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2to3 isn't (ironically) translating lib2to3 so that it can run under Python 3:
File "/Users/bcannon/Developer/repo/benchmarks_py3k/lib/2to3/lib2to3/fixes/fix_operator.py", line 89, in _check_method
 method = getattr(self, "_" + results["method"][0].value.encode("ascii"))
Might need to let Python 3 use its stdlib copy of lib2to3. Otherwise will need to come up with a way to have two copies of a library, one for Python 2 and another for Python 3, and then copy the right thing. Maybe a lib3 directory that is only copied over by make_perf3.sh?

> Might need to let Python 3 use its stdlib copy of lib2to3. Otherwise
> will need to come up with a way to have two copies of a library, one
> for Python 2 and another for Python 3, and then copy the right thing.
> Maybe a lib3 directory that is only copied over by make_perf3.sh?
Sounds like a good idea.
Even better if you can find a 3.x copy of lib2to3 which is close the 2.x
one :-)

On Fri, Aug 31, 2012 at 6:42 PM, Antoine Pitrou <report@bugs.python.org>wrote:
>
> Antoine Pitrou added the comment:
>
> > Might need to let Python 3 use its stdlib copy of lib2to3. Otherwise
> > will need to come up with a way to have two copies of a library, one
> > for Python 2 and another for Python 3, and then copy the right thing.
> > Maybe a lib3 directory that is only copied over by make_perf3.sh?
>
> Sounds like a good idea.
> Even better if you can find a 3.x copy of lib2to3 which is close the 2.x
> one :-)
>
I think short of copying the stdlib versions from Python 2.7 and 3.2 I
don't think there is much choice short of doing a 2to3+fixes translation
ourselves just to have a version that is as close to the same as possible.
But looking at the stdlib versions they are practically the same already
except that one uses StringIO and the other uses io.StringIO (and Python 3
doesn't need the encode() call that triggered this whole discussion). I
don't remember if StringIO or io.StringIO is faster in Python 2.6 and 2.7,
but based on that we can either leave it as-is or tweak it to use the other
just for benchmarking to make it even.

Since lib3 now exists we should probably take advantage and just keep a translated, patched copy of 2to3 there to avoid this problem while keeping performance on an even keel for comparison.

New changeset 66f168b468c3 by Brett Cannon in branch 'default':
#15834: Make 2to3 so it can actually be proper translated.
http://hg.python.org/benchmarks/rev/66f168b468c3