Samuele Pedroni points out in python-dev that the <...>
style reprs of Python objects are not documented,
standardized or even consistent (e.g. compare old-style
and new-style classes).

Yet there is plenty of code out there that for various
reasons parses these things or a least depends on what
they look like (the parrot benchmark being only the
latest example).

So it would behoove us to standardize these. An easy
way would be unit tests. Any takers?