Barry A. Warsaw added the comment:

Ezio, the problem with your patch is that it also gives a warning on this code, 
which is totally safe:

def good():
    exc = None
    try:
        bar(int(sys.argv[1]))
    except KeyError as e:
        print('ke')
        exc = e
    except ValueError as e:
        print('ve')
        exc = e
    print(exc)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17792>
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