[3.8] bpo-37467: Fix PyErr_Display() for bytes filename (GH-14504) #14514
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Fix sys.excepthook() and PyErr_Display() if a filename is a bytes
string. For example, for a SyntaxError exception where the filename
attribute is a bytes string.
Cleanup also test_sys:
setUp()/tearDown(): do it in each test method.
(cherry picked from commit f9b7457)
Co-authored-by: Victor Stinner vstinner@redhat.com
https://bugs.python.org/issue37467