The bug tracker is not a place to get help debugging your code.  Your
code is not a complete example, and is doing odd things with try/except
and the printing of errors which may well be masking what is really
going on, so I can't begin to evaluate whether or not you've found a
real bug, but it seems unlikely.  Please post your question to
python-list (or perhaps even python-tutor), and if it turns out you do
have a real bug, reopen this ticket.