Python testtools 模块，skip() 实例源码

def _get_tmpdir_for_xattr(self):
        tmp_rootdir = os.getenv("TMPDIR_FOR_XATTR")
        # NOTE(sileht): Don't skip test if user have explicitly set a directory
        if not tmp_rootdir:
            try:
                d = drivers.Driver(tmp_rootdir=tmp_rootdir)
                self.useFixture(d)
                d._ensure_xattr_support()
            except RuntimeError as e:
                self.skipTest(str(e))
        return tmp_rootdir