python导入错误，好像是递归导入，但无法通过这种方式解决

Question

已更新 问题已解决，我这里有一些设计问题。

目录如下所示:

/view
  |-__init__.py
  |-quiz.py
  |-test.py
  |-user.py

问题是在 quiz.py 中，我从 test 导入了一个 class。在 test.py 中，我从 quiz 导入了一个 class。

更新:我更改了import，但仍然存在AttributeError

代码如下:

quiz.py

#ignore some imports here
import test
from user import User

class Quiz(Document):
    creator         =   ReferenceField(User, reverse_delete_rule=CASCADE)
    info            =   GenericEmbeddedDocumentField("QuizInfo")
    description     =   StringField(max_length=100)
    attachment      =   GenericEmbeddedDocumentField("QuizAttach")
    correctanswer   =   GenericEmbeddedDocumentField("QuizAnswer")
    wronganswer     =   GenericEmbeddedDocumentField("QuizAnswer")
    manualdifficulty=   FloatField(min_value=0, max_value=1)
    autodifficulty  =   FloatField(min_value=0, max_value=1)
    checkout        =   GenericEmbeddedDocumentField("QuizCheckcout")
    tag             =   ListField(StringField(max_length=20))

#ignore some codes here

class QuizCheckout(EmbeddedDocument):
    time            =   DateTimeField()
    type            =   IntField()
    description     =   StringField()
    test            =   ReferenceField(test.Test, reverse_delete_rule=CASCADE)

测试.py

import quiz


class Test(Document):
    createdate      =   DateTimeField()             #Create datetime
    description     =   StringField()               #decription of this test
    takennumber     =   IntField()                  #the number of students who may take this test
    quiz            =   GenericEmbeddedDocumentField('TestQuiz')

class TestQuiz(EmbeddedDocument):
    quiz            =   ListField(ReferenceField(quiz.Quiz, reverse_delete_rule=CASCADE))
                        #Reference to Quiz, if Quiz is deleted, this reference will be deleted too.
    correct         =   IntField()
                        #how many students got this right

错误是

Exception Type: AttributeError Exception
Value: 'module' object has no attribute 'Quiz'

一开始以为可能是递归的问题，后来才发现可以将import移到函数中，避免递归导入，但是这里没有函数，我尝试将移到函数中>import 到类中，它不起作用。

有没有办法将这些定义保存在单独的文件中？

Answer 1

这是典型的循环导入情况。您可以简单地“导入测试”，然后通过 test.Test 访问测试，而不是使用“from test import Test”。有关详细信息，请参阅此 stackoverflow question .