[issue21202] Naming a file` io.py` causes cryptic error message

[Christian Theune]

Christian Theune added the comment:

I managed to create a patch that relies (in hopefully reasonably safe manner) on embedding an object repr for identification in this and similar cases. This is basically what implements what Martin suggested.

Caveat emptor: my C knowledge is only good enough to be dangerous. Thomas Wouters and RDM helped me through it.

I haven't adapted the tests yet (lots of failures due to the output change) but I managed them to stop crashing.

The 'repr.py' in the root is my current testbed to see what's going on.

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nosy: +ctheune, r.david.murray, twouters

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<http://bugs.python.org/issue21202>
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