[issue18202] Minor fixes for test_coding

[STINNER Victor]

STINNER Victor added the comment:

The patch looks good to me. It may be better to split it in two commits: fix test_exec_valid_coding() in Python 3.3, cleanup test only in python 3.4. As you want.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18202>
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