[issue20373] Use test.script_helper.assert_python_ok() instead of subprocess.* in test.test_warnings

[Antoine Pitrou]

Antoine Pitrou added the comment:

Thanks for the patch!

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resolution:  -> fixed
stage: patch review -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20373>
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