Not having a __repr__ attribute seem to cause problems for:

    pprint.pformat

in Python 2.4.  This problem goes away when I use a Zope instance for 
Python 2.3.

The error message is generated when I try to access a private
workspace in the CPS interface.

I inserted a bit of debugging code, and I've attached a file that
contains the debugging print-out of the data that caused the error
and also the traceback.

I'm using:

    CPS-3.2.1
    Zope-2.7.3-0
    Python 2.4b2 built from source

on Linux.

I've attached a file containing a bit of debugging information and also 
the traceback.

Dave

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This should be fixed in pprint.py 1.31 in current CVS. Thanks 
for the report.

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This problem affects matplotlib still.  Here is a short example:

import pprint
from matplotlib.transforms import unit_bbox
b = unit_bbox()
pprint.pformat(b)

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Which version of Python are you using? Can you post a stack
trace?

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This is python 2.4.1 in gentoo linux, compiled from source.
 Other python 2.4 linux reported the same affect.  I don't
know how to get a stack trace when python seg faults.

We fixed the issue in matplolib's cvs by adding __repr__
support to all the wrapped cxx objects.

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I didn't realize that Python segfaults. I don't think your
problem is related to this bug.

To get a stacktrace for the segfault you should compile a
debug version of Python (via configure --with-pydebug &&
make), then start gdb with it (gdb ./python) then start the
program (run), with gives you a Python prompt, where you can
import your failing code. After the segfault you should be
back in the debugger, where you can display a stacktrace via
the bt command.