[issue22340] Fix Python 3 warnings in Python 2 tests

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Why test_support.check_py3k_warnings is not used in test_calltips.py? Or may be change the test to "1+0", "1//0" or "1.0/0.0"?

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nosy: +serhiy.storchaka, terry.reedy

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<http://bugs.python.org/issue22340>
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