magentoapi与Python（获取信用备忘录）的问题？

Question

我这里有代码：

client = magento.API(url, apiuser, apipass)
with magento.Order(url, apiuser, apipass) as order_api:
    order_increment_id = '200001071 '
    status = 'canceled'
    order = order_api.info(order_increment_id)
    print order['total_paid']

meo = client.credit_memo.list()
print meo'''

订单被接受了，并且打印了“已付款总额”，但是当涉及到信用备忘录时，我不能接受清单。有什么帮助吗？谢谢