Django ImportError：没有名为中间件的模块

Question

I am using Django version 1.8 and python 2.7. I am getting the following error after running my project.

Traceback (most recent call last):
  File "C:\Python27\lib\wsgiref\handlers.py", line 85, in run
    self.result = application(self.environ, self.start_response)
  File "C:\Python27\lib\site-packages\django\contrib\staticfiles\handlers.py", line 63, in __call__
    return self.application(environ, start_response)
  File "C:\Python27\lib\site-packages\django\core\handlers\wsgi.py", line 170, in __call__
    self.load_middleware()
  File "C:\Python27\lib\site-packages\django\core\handlers\base.py", line 50, in load_middleware
    mw_class = import_string(middleware_path)
  File "C:\Python27\lib\site-packages\django\utils\module_loading.py", line 26, in import_string
    module = import_module(module_path)
  File "C:\Python27\lib\importlib\__init__.py", line 37, in import_module
    __import__(name)
ImportError: No module named middleware
[26/Aug/2015 20:34:29] "GET /favicon.ico HTTP/1.1" 500 59

This is my settings.py file

"""
Django settings for collageapp project.

Generated by 'django-admin startproject' using Django 1.8.

For more information on this file, see
https://docs.djangoproject.com/en/1.8/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/1.8/ref/settings/
"""

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
import os

APP_PATH = os.path.dirname(os.path.abspath(__file__))
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/1.8/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = '******************************************************'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = []


# Application definition

INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'manageApp',
    'django.contrib.sites',
    'allauth',
    'allauth.account',
    'allauth.socialaccount',
    'allauth.socialaccount.providers.facebook',
    'allauth.socialaccount.providers.google',
    'django.contrib.admindocs',
    'rest_framework',
)

SITE_ID = 1

MIDDLEWARE_CLASSES = (
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'django.middleware.security.SecurityMiddleware',
    'corsheaders.middleware.CorsMiddleware',
    'oauth2_provider.middleware.OAuth2TokenMiddleware',
)


ROOT_URLCONF = 'collageapp.urls'
CORS_ORIGIN_ALLOW_ALL = True

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
                'allauth.account.context_processors.account',
                'allauth.socialaccount.context_processors.socialaccount'
            ],
        },
    },
]

WSGI_APPLICATION = 'collageapp.wsgi.application'


# Database
# https://docs.djangoproject.com/en/1.8/ref/settings/#databases

DATABASES = {
     'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'college_app',
        'USER': 'root',
        'PASSWORD': '',
        'HOST': 'localhost',   # Or an IP Address that your DB is hosted on
        'PORT': '3306',
    }
}



# Internationalization
# https://docs.djangoproject.com/en/1.8/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/1.8/howto/static-files/

STATIC_URL = '/static/'

I have tried surfing the error but in vain. My same code is working fine in other machine.

Answer 1

Open up a python shell by running python manage.py shell in your project directory.

Run the following commands one at a time in the python shell:

>>> from corsheaders.middleware import CorsMiddleware
>>> from oauth2_provider.middleware import OAuth2TokenMiddleware
>>> from django.contrib.auth.middleware import SessionAuthenticationMiddleware

One of the lines should give you an error like the following:

Traceback (most recent call last):
  File "<console>", line 1, in <module>
ImportError: No module named middleware

The line that gives you that error is the missing module that is giving you the problem.

To find the path where the modules are searched, do

>>> import sys; sys.path

---

Alternatively, if you don't know how to use the python shell, you could just remove the following lines in your settings.MIDDLEWARE_CLASSES one at a time until you don't get that error anymore:

'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'corsheaders.middleware.CorsMiddleware',
'oauth2_provider.middleware.OAuth2TokenMiddleware',

---

Just reinstall the package that gave you the error.

django.contrib.auth.middleware -> django

corsheaders.middleware -> corsheaders

oauth2_provider.middleware -> oauth2_provider

Answer 2

Make sure that you have all of the supporting packages installed where they can be found. I've run into problems where there are multiple Python interpreters installed, and was inadvertently running Django with one interpreter while installing packages with another. The other thing I would verify is that you have the same versions of the packages on both machines. Pay close attention to corsheaders.middleware.CorsMiddleware and oauth2_provider.middleware.OAuth2TokenMiddleware since they are not part of Django.

Answer 3

For my situation i did the following:

1. Inspect the settings.py file
2. Check on the middleware section for any part that could have been deleted,accidentally and rectify.

For my case the following had been deleted:

django.middleware.security.SecurityMiddleware