test_atexit.py 文件源码

def test_sys_override(self):
        # be sure a preset sys.exitfunc is handled properly
        exfunc = sys.exitfunc
        sys.exitfunc = self.h1
        reload(atexit)
        try:
            atexit.register(self.h2)
            atexit._run_exitfuncs()
        finally:
            sys.exitfunc = exfunc
        self.assertEqual(self.subst_io.getvalue(), "h2\nh1\n")