STINNER Victor <victor.stin...@haypocalc.com> added the comment:

I found this problem while running test_os with python -bb: there is an error 
on os.get_exec_path() because this function checks if b'PATH' key exists in the 
input dictionary. Extract of the function:

def get_exec_path(env=None):
    if env is None:
        env = environ

    try:
        path_list = env.get('PATH')
    except TypeError:
        path_list = None

    if supports_bytes_environ:
        try:
            path_listb = env[b'PATH']
        except (KeyError, TypeError):
            pass
        else:
    (...)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9636>
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