[issue28023] python-gdb.py must be updated for the new Python 3.6 compact dict

[INADA Naoki]

INADA Naoki added the comment:

Thanks a lot!

I hope I can run test on multiple environment before merge,
after we move to Github.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28023>
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