Python 如何使脚本的返回值为0

我有一个脚本可以触发另一个脚本：

exit_status = subprocess.call([RUN_SCRIPT)]
if exit_status: # if successful output
    # do something
else: # if script is not successful
    # send email to admins

# RUN_SCRIPT
if return_value < error_threshold:
    # return exit status = 1
if return_value > error_threshold:
    # return exit status = 0

我该怎么做

sys.exit0/sys.exit1