test_which.py 文件源码

def test_which_should_not_match_folders(self):
        " Which does not match folders, even though they are executable. "
        # make up a path and insert a folder that is 'executable', a naive
        # implementation might match (previously pexpect versions 3.2 and
        # sh versions 1.0.8, reported by @lcm337.)
        fname = 'g++'
        bin_dir = tempfile.mkdtemp()
        bin_dir2 = os.path.join(bin_dir, fname)
        save_path = os.environ['PATH']
        try:
            os.environ['PATH'] = bin_dir
            os.mkdir(bin_dir2, 0o755)
            # should not be found because it is not executable *file*,
            # but rather, has the executable bit set, as a good folder
            # should -- it should not be returned because it fails isdir()
            exercise = pexpect.which(fname)
            assert exercise is None

        finally:
            # restore,
            os.environ['PATH'] = save_path
            # destroy scratch folders,
            for _dir in (bin_dir2, bin_dir,):
                if os.path.exists(_dir):
                    os.rmdir(_dir)