我已使用Django框架请求登录API，但URL模式出现“ 循环导入”错误。请任何人给我们一个有关问题的解决方案。
将错误日志写入日志文件：
[Sun Mar 10 20:30:47.407794 2019] [wsgi:error] [pid 21457:tid 139659590813440] Internal Server Error: /ai_chat_bot/users/login
[Sun Mar 10 20:30:47.407814 2019] [wsgi:error] [pid 21457:tid 139659590813440] Traceback (most recent call last):
[Sun Mar 10 20:30:47.407816 2019] [wsgi:error] [pid 21457:tid 139659590813440] File "/opt/python/ai_rest_env/lib/python3.5/site-packages/django/urls/resolvers.py", line 542, in url_patterns
[Sun Mar 10 20:30:47.407818 2019] [wsgi:error] [pid 21457:tid 139659590813440] iter(patterns)
[Sun Mar 10 20:30:47.407819 2019] [wsgi:error] [pid 21457:tid 139659590813440] TypeError: 'module' object is not iterable
[Sun Mar 10 20:30:47.407821 2019] [wsgi:error] [pid 21457:tid 139659590813440]
[Sun Mar 10 20:30:47.407822 2019] [wsgi:error] [pid 21457:tid 139659590813440] During handling of the above exception, another exception occurred:
[Sun Mar 10 20:30:47.407823 2019] [wsgi:error] [pid 21457:tid 139659590813440]
[Sun Mar 10 20:30:47.407825 2019] [wsgi:error] [pid 21457:tid 139659590813440] Traceback (most recent call last):
[Sun Mar 10 20:30:47.407826 2019] [wsgi:error] [pid 21457:tid 139659590813440] File "/opt/python/ai_rest_env/lib/python3.5/site-packages/django/core/handlers/exception.py", line 35, in inner
[Sun Mar 10 20:30:47.407828 2019] [wsgi:error] [pid 21457:tid 139659590813440] response = get_response(request)
[Sun Mar 10 20:30:47.407829 2019] [wsgi:error] [pid 21457:tid 139659590813440] File "/opt/python/ai_rest_env/lib/python3.5/site-packages/django/utils/deprecation.py", line 93, in __call__
[Sun Mar 10 20:30:47.407831 2019] [wsgi:error] [pid 21457:tid 139659590813440] response = self.process_request(request)
[Sun Mar 10 20:30:47.407832 2019] [wsgi:error] [pid 21457:tid 139659590813440] File "/opt/python/ai_rest_env/lib/python3.5/site-packages/django/middleware/common.py", line 60, in process_request
[Sun Mar 10 20:30:47.407834 2019] [wsgi:error] [pid 21457:tid 139659590813440] if self.should_redirect_with_slash(request):
[Sun Mar 10 20:30:47.407835 2019] [wsgi:error] [pid 21457:tid 139659590813440] File "/opt/python/ai_rest_env/lib/python3.5/site-packages/django/middleware/common.py", line 78, in should_redirect_with_slash
[Sun Mar 10 20:30:47.407837 2019] [wsgi:error] [pid 21457:tid 139659590813440] not is_valid_path(request.path_info, urlconf) and
[Sun Mar 10 20:30:47.407838 2019] [wsgi:error] [pid 21457:tid 139659590813440] File "/opt/python/ai_rest_env/lib/python3.5/site-packages/django/urls/base.py", line 157, in is_valid_path
[Sun Mar 10 20:30:47.407840 2019] [wsgi:error] [pid 21457:tid 139659590813440] resolve(path, urlconf)
[Sun Mar 10 20:30:47.407841 2019] [wsgi:error] [pid 21457:tid 139659590813440] File "/opt/python/ai_rest_env/lib/python3.5/site-packages/django/urls/base.py", line 24, in resolve
[Sun Mar 10 20:30:47.407843 2019] [wsgi:error] [pid 21457:tid 139659590813440] return get_resolver(urlconf).resolve(path)
[Sun Mar 10 20:30:47.407844 2019] [wsgi:error] [pid 21457:tid 139659590813440] File "/opt/python/ai_rest_env/lib/python3.5/site-packages/django/urls/resolvers.py", line 498, in resolve
[Sun Mar 10 20:30:47.407845 2019] [wsgi:error] [pid 21457:tid 139659590813440] for pattern in self.url_patterns:
[Sun Mar 10 20:30:47.407856 2019] [wsgi:error] [pid 21457:tid 139659590813440] File "/opt/python/ai_rest_env/lib/python3.5/site-packages/django/utils/functional.py", line 36, in __get__
[Sun Mar 10 20:30:47.407858 2019] [wsgi:error] [pid 21457:tid 139659590813440] res = instance.__dict__[self.name] = self.func(instance)
[Sun Mar 10 20:30:47.407859 2019] [wsgi:error] [pid 21457:tid 139659590813440] File "/opt/python/ai_rest_env/lib/python3.5/site-packages/django/urls/resolvers.py", line 549, in url_patterns
[Sun Mar 10 20:30:47.407861 2019] [wsgi:error] [pid 21457:tid 139659590813440] raise ImproperlyConfigured(msg.format(name=self.urlconf_name))
[Sun Mar 10 20:30:47.407863 2019] [wsgi:error] [pid 21457:tid 139659590813440] django.core.exceptions.ImproperlyConfigured: The included URLconf 'AI_Chatbot_Server.urls' does not appear to have any patterns in it. If you see valid patterns in the file then the issue is probably caused by a circular import.
“ AI_Chatbot_Server.urls ”文件的源代码：
from django.contrib import admin
from django.urls import path, include
urlpatterns = [
path('admin/', admin.site.urls),
# chatbot app url list
path('ai_chat_bot/', include("apps.chatbot.urls")),
path('ai_chat_bot/users/', include("apps.users.urls")),
path('ai_chat_bot/weather/', include("apps.weather.urls")),
]
更新1：
用户模块网址：
from django.urls import path
from .controller import login_controller
urlpatterns = [
path('login', login_controller.LoginController.login, name='login'),
]
Chatbot模块网址：
from django.urls import path
from .controller import chatbot_main_controller
urlpatterns = [
path('get_question/', chatbot_main_controller.ChatBotMainController.get_question, name="get_question"),
]
天气模块网址：
from django.urls import path
from ..weather.controller import weather_info_controller
urlpatterns = [
path('get_weather_info/', weather_info_controller.WeatherInfoController.get_weather_info, name="get_weather_info"),
]
更新2：
我具有用户，聊天机器人和天气模块的共享文件夹结构：
.
├─.idea
├─AI_Chatbot_Server
│ └─settings
├─apps
│ ├─chatbot
│ │ ├─ai_models
│ │ │ ├─cnn
│ │ │ │ └─temp
│ │ │ ├─estimator
│ │ │ ├─multiclass_cnn
│ │ │ │ └─temp
│ │ │ ├─multiclass_dnn
│ │ │ │ └─temp
│ │ │ └─tensorflow
│ │ ├─ai_model_handler
│ │ ├─common
│ │ ├─config
│ │ ├─controller
│ │ ├─data_processor
│ │ ├─emoji
│ │ │ ├─common
│ │ │ ├─controller
│ │ │ ├─model
│ │ │ ├─repository
│ │ │ ├─serializer
│ │ │ └─service
│ │ ├─evaluation
│ │ │ ├─controller
│ │ │ ├─model
│ │ │ ├─repository
│ │ │ ├─serializer
│ │ │ └─service
│ │ ├─keyword
│ │ │ ├─common
│ │ │ ├─controller
│ │ │ ├─helper
│ │ │ ├─logic
│ │ │ ├─models
│ │ │ ├─repository
│ │ │ ├─serializer
│ │ │ └─service
│ │ ├─models
│ │ ├─repository
│ │ ├─serializer
│ │ ├─service
│ │ ├─utils
│ │ └─validation
│ ├─common
│ ├─users
│ │ ├─common
│ │ ├─controller
│ │ ├─json
│ │ ├─model
│ │ ├─repository
│ │ ├─serializer
│ │ └─service
│ └─weather
│ ├─common
│ ├─controller
│ └─service
├─common
└─static
├─data
└─resources
└─images
└─emoji
更新3： 我已经添加了登录控制器，请检查一下。
import logging
from json.decoder import JSONDecodeError
from django.core.exceptions import ObjectDoesNotExist
from django.db.utils import IntegrityError
from django.http import JsonResponse
from rest_framework.decorators import api_view
from ..common.http_code import HttpCode
from ..common.http_message import HttpMessage
from ..common.user_constant import UserConstant
from ..common.utility import Utility
from ..json.response import Response
from ..service.login_service import LoginService
from ..service.login_service import LoginService as loginService
class LoginController:
logger = logging.getLogger('LoginController')
@api_view(['POST'])
def login(request):
LoginController.logger.info("LoginController.login : START")
http_status_code = HttpCode.HTTP_ZERO
post_data = None
responseData = None
# check valid json format & added json format exception
try:
post_data = Utility.convertRequestBodyToJson(request)
except JSONDecodeError as ex:
responseData = Response.preparedResponse(UserConstant.ERROR, str(ex.args), None)
LoginController.logger.error(UserConstant.JSON_PARSE_ERROR + str(ex))
http_status_code = HttpCode.HTTP_BAD_REQUEST
# check request param
if post_data != None:
username = post_data['username']
password = post_data['password']
# check valid user & password
try:
try:
valid_user = loginService.check_username(username)
except ObjectDoesNotExist:
valid_user = None
if valid_user != None:
decoded_password = loginService.decoded_password(valid_user)
if decoded_password == password:
# save user access with token
user_access = loginService.set_user_access(valid_user)
if user_access != None:
loginService.save_user_access(user_access)
user_role = loginService.get_user_role(valid_user)
login_service = LoginService()
# process user_access_history data
# login_service.process_user_access_history(valid_user.username, user_access.token)
if user_role != None:
# prepare the user response object
users = {'id': valid_user.id, 'username': valid_user.username,
'token': user_access.token, 'role': user_role.name,
'user_image_url': valid_user.user_image_url}
# added common method for prepare response object
responseData = Response.preparedResponse(UserConstant.SUCCESS,
UserConstant.USER_AUTHENTICATION_SUCCESSFUL,
users)
http_status_code = HttpCode.HTTP_OK
else:
responseData = Response.preparedResponse(UserConstant.ERROR,
UserConstant.INCORRECT_USER_PASSWORD, None)
http_status_code = HttpCode.HTTP_UNAUTHORIZED
else:
responseData = Response.preparedResponse(UserConstant.ERROR, UserConstant.USER_AUTHENTICATION_FAIL,
None)
http_status_code = HttpCode.HTTP_UNAUTHORIZED
except IntegrityError as ex:
responseData = Response.preparedResponse(UserConstant.ERROR, str(ex.args), None)
LoginController.logger.error(UserConstant.DATABASE_ERROR + str(ex))
http_status_code = HttpCode.HTTP_INTERNAL_SERVER_ERROR
except Exception as ex:
LoginController.logger.error(UserConstant.ERROR + str(ex))
responseData = Response.preparedResponse(UserConstant.ERROR, HttpMessage.INTERNAL_SERVER_ERROR, None)
http_status_code = HttpCode.HTTP_INTERNAL_SERVER_ERROR
LoginController.logger.info("LoginController.login : END")
return JsonResponse(status=http_status_code, data=responseData, safe=False)
答案 0 :(得分：0)
让我从文档中搜索与circular import相关的问题
https://docs.djangoproject.com/en/2.0/search/?q=circular+import
下面我列出了所有内容，并尝试给出循环导入的负责任的内容。 由于您尚未共享完整的代码，因此请仔细阅读文档并重新构建代码 根据文件建议。希望这会有所帮助。
1。设置
https://docs.djangoproject.com/en/2.0/ref/settings/#message-level
如果您在设置文件中覆盖MESSAGE_LEVEL并依赖于任何内置常量，则必须直接导入常量模块以避免可能的循环导入，例如：
from django.contrib.messages import constants as message_constants
MESSAGE_LEVEL = message_constants.DEBUG
https://docs.djangoproject.com/en/2.0/ref/settings/#message-tags
如果您在设置文件中覆盖MESSAGE_TAGS并依赖于任何内置常量，则必须直接导入常量模块，以避免可能的循环导入，例如：
from django.contrib.messages import constants as message_constants
MESSAGE_TAGS = {message_constants.INFO: ''}
2编码样式
https://docs.djangoproject.com/en/2.0/internals/contributing/writing-code/coding-style/#imports
您可以运行“ isort -rc”命令来组织导入。
3个翻译
如果您定义了自定义的LANGUAGES设置（如上一个项目符号中所述），则可以将语言名称标记为翻译字符串-但请使用gettext_lazy（）而不是gettext（）以避免循环导入。
这是一个示例设置文件：
from django.utils.translation import gettext_lazy as _
LANGUAGES = [
('de', _('German')),
('en', _('English')),
]
4个Django 1.7发行说明
https://docs.djangoproject.com/en/2.0/releases/1.7/#django-utils-module-loading-import-by-path
5个模型字段参考
class Car(models.Model):
manufacturer = models.ForeignKey(
'production.Manufacturer',
on_delete=models.CASCADE,
)
这种引用称为惰性关系，在解决两个应用程序之间的循环导入依赖关系时很有用。
https://docs.djangoproject.com/en/2.0/ref/models/fields/#foreignkey
6。模型信号
https://docs.djangoproject.com/en/2.0/ref/signals/
7。在Django中自定义身份验证
8。高级测试主题
9。迁移
https://docs.djangoproject.com/en/2.0/topics/migrations/#squashing-migrations
可能还有其他问题，但可能会有所帮助。