相关疑难解决方法(0)

我试图运行这个测试:self.assertRaises(AttributeError, branch[0].childrennodes)和branch[0]没有属性childrennodes,所以它应该被抛出AttributeError,其中assertRaises应赶上,但是当我运行测试,测试,因为它是抛出一个失败AttributeError.

Traceback (most recent call last):
  File "/home/tttt/../tttt/tests.py", line 504, in test_get_categories_branch
    self.assertRaises(AttributeError, branch[0].children_nodes)
AttributeError: 'Category' object has no attribute 'children_nodes'

有任何想法吗？