尝试在 Python Anywhere 上部署我的 Django Rest API；不断收到 ModuleNotFoundError: No module named 'django.contrib.sessions'答案

【问题标题】：Trying to Deploy My Django Rest API on Python Anywhere; keep receiving ModuleNotFoundError: No module named 'django.contrib.sessions'尝试在 Python Anywhere 上部署我的 Django Rest API；不断收到 ModuleNotFoundError: No module named 'django.contrib.sessions'
【发布时间】：2020-11-01 02:44:08
【问题描述】：

我试图在 PythonAnywhere.com 上部署我的 django-rest-framework api，但我不断收到 django.contrib.session 找不到。

**我已阅读 PythonAnywher.com 上的文档，并执行了以下步骤：(https://help.pythonanywhere.com/pages/DeployExistingDjangoProject) (https://help.pythonanywhere.com/pages/DebuggingImportError)

能够自行运行 wsgi.py 文件
能够正常运行 import myproject.settings
能够运行 python /path/to/myapp/settings.py 且没有错误
无法弄清楚他们所说的影子是什么意思。所有的包都是通过pipfile导入virutalenv中的
能够验证检查 virtualenv Python 版本是否正确**

Settings.py

import os

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

SECRET_KEY = 'its a secret'

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

ALLOWED_HOSTS = ['*']


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
     'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'django.contrib.sites',
     'corsheaders',
    'rest_framework',
    'menus',
    'login',
]

MIDDLEWARE = [
     'corsheaders.middleware.CorsMiddleware',
  'whitenoise.middleware.WhiteNoiseMiddleware',
    'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'chefsBackEnd.urls'

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',
                'django.template.context_processors.media',
            ],
        },
    },
]

WSGI_APPLICATION = 'chefsBackEnd.wsgi.application'

# Database
# https://docs.djangoproject.com/en/3.0/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}

# DATABASES = {}
# DATABASES['default'] = dj_database_url.config(conn_max_age=600)




# Password validation
# https://docs.djangoproject.com/en/3.0/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator'},
    {'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator'},
    {'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator'},
    {'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator'},
]

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/3.0/howto/static-files/

STATIC_ROOT = os.path.join(BASE_DIR, 'staticfiles')
STATIC_URL = '/static/'

# Extra places for collectstatic to find static files.
STATICFILES_DIRS = (
    os.path.join(BASE_DIR, 'static'),
)

# STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'

MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
MEDIA_URL = '/media/'

SITE_ID = 1

REST_FRAMEWORK = {
    'DEFAULT_PERMISSION_CLASSES': (
        'rest_framework.permissions.AllowAny',
    ),
    'DEFAULT_AUTHENTICATION_CLASSES': (
        # 'rest_framework.authentication.TokenAuthentication',
        # 'rest_framework_simplejwt.authentication.JWTAuthentication',
        'rest_framework_jwt.authentication.JSONWebTokenAuthentication',

        'rest_framework.authentication.BasicAuthentication',
        'rest_framework.authentication.SessionAuthentication',
    ),
    'DEFAULT_PERMISSION_CLASSES': (
        'rest_framework.permissions.IsAuthenticated',
    )

}

CORS_ORIGIN_ALLOW_ALL = True
CORS_ALLOW_CREDENTIALS = True


CORS_ORIGIN_WHITELIST = [
    # 'http://localhost:3000',
    # 'http://localhost:5000',

    'https://chefs-table-mock-site.herokuapp.com',
    'https://git.heroku.com/phlog-api.git'

]

CORS_ALLOW_METHODS = [
    'DELETE',
    'GET',
    'OPTIONS',
    'PATCH',
    'POST',
    'PUT',
]

JWT_AUTH = {
    'JWT_RESPONSE_PAYLOAD_HANDLER': 'chefsBackEnd.utils.resp_handler',
    'JWT_ALGORITHM': 'HS256',
    'JWT_VERIFY': True,
}

CSRF_COOKIE_NAME = "csrftoken"




> Traceback (most recent call last):   File
> "/home/jgartsu12/.virtualenvs/chefsBackEnd-virtualenv/lib/python3.8/site-packages/django/apps/config.py",
> line 118, in create
>     cls = getattr(mod, cls_name)
> **AttributeError: module 'django.contrib' has no attribute 'sessions'** During handling of the above exception, another exception
> occurred: Traceback (most recent call last):   File "manage.py", line
> 21, in <module>
>     main()   File "manage.py", line 17, in main
>     execute_from_command_line(sys.argv)   File "/home/jgartsu12/.virtualenvs/chefsBackEnd-virtualenv/lib/python3.8/site-packages/django/core/management/__init__.py",
> line 401, in execute_f rom_command_line
>     utility.execute()   File "/home/jgartsu12/.virtualenvs/chefsBackEnd-virtualenv/lib/python3.8/site-packages/django/core/management/__init__.py",
> line 377, in execute
>     django.setup()   File "/home/jgartsu12/.virtualenvs/chefsBackEnd-virtualenv/lib/python3.8/site-packages/django/__init__.py",
> line 24, in setup
>     apps.populate(settings.INSTALLED_APPS)   File "/home/jgartsu12/.virtualenvs/chefsBackEnd-virtualenv/lib/python3.8/site-packages/django/apps/registry.py",
> line 91, in populate
>     app_config = AppConfig.create(entry)   File "/home/jgartsu12/.virtualenvs/chefsBackEnd-virtualenv/lib/python3.8/site-packages/django/apps/config.py",
> line 136, in create
>     import_module(entry)   File "/home/jgartsu12/.virtualenvs/chefsBackEnd-virtualenv/lib/python3.8/importlib/__init__.py",
> line 127, in import_module
>     return _bootstrap._gcd_import(name[level:], package, level)   File "<frozen importlib._bootstrap>", line 1014, in _gcd_import   File
> "<frozen importlib._bootstrap>", line 991, in _find_and_load   File
> "<frozen importlib._bootstrap>", line 973, in _find_and_load_unlocked
> **ModuleNotFoundError: No module named 'django.contrib.sessions'**

基于ImportError: No module named 'django.contrib.sessions'，他们能够将 django 的版本更改为我必须让它运行的版本，但我一直遇到同样的问题。

这一定是这个特定版本的 Django (1.10.5) 的问题，因为更新到 1.10.8 似乎已经解决了这个问题。 -https://stackoverflow.com/questions/51791493/importerror-no-module-named-django-contrib-sessions

另外，这来自 PythonAnywhere.com 上的错误日志：

> 2020-07-08 19:54:28,687: Not Found: /favicon.ico 2020-07-08
> 21:27:50,215: Not Found: /static/admin/css/fonts.css 2020-07-08
> 21:31:05,154: Not Found: /static/admin/css/base.css 2020-07-08
> 21:31:05,157: Not Found: /static/admin/css/login.css 2020-07-08
> 21:31:05,194: Not Found: /static/admin/css/responsive.css 2020-07-08
> 21:31:15,815: Not Found: /static/admin/css/base.css 2020-07-08
> 21:31:15,819: Not Found: /static/admin/css/login.css 2020-07-08
> 21:31:15,825: Not Found: /static/admin/css/responsive.css 2020-07-08
> 21:31:26,680: Not Found: /static/admin/css/base.css 2020-07-08
> 21:31:26,685: Not Found: /static/admin/css/login.css 2020-07-08
> 21:31:26,689: Not Found: /static/admin/css/responsive.css 2020-07-08
> 21:31:36,012: Not Found: /api 2020-07-08 21:34:15,458: Not Found:
> /static/admin/css/fonts.css 2020-07-08 21:37:24,180: Not Found:
> /static/admin/css/fonts.css 2020-07-10 22:25:10,104: Error running
> WSGI application 2020-07-10 22:25:10,124: ModuleNotFoundError: No
> module named 'django.contrib.sessions' 2020-07-10 22:25:10,124:   File
> "/var/www/jgartsu12_pythonanywhere_com_wsgi.py", line 16, in <module>
> 2020-07-10 22:25:10,124:     application = get_wsgi_application()
> 2020-07-10 22:25:10,124:  2020-07-10 22:25:10,124:   File
> "/home/jgartsu12/.virtualenvs/chefsBackEnd-virtualenv/lib/python3.8/site-packages/django/core/wsgi.py",
> line 12, in get_wsgi_application 2020-07-10 22:25:10,125:    
> django.setup(set_prefix=False) 2020-07-10 22:25:10,125:  2020-07-10
> 22:25:10,125:   File
> "/home/jgartsu12/.virtualenvs/chefsBackEnd-virtualenv/lib/python3.8/site-packages/django/__init__.py",
> line 24, in setup 2020-07-10 22:25:10,125:    
> apps.populate(settings.INSTALLED_APPS) 2020-07-10 22:25:10,125: 
> 2020-07-10 22:25:10,125:   File
> "/home/jgartsu12/.virtualenvs/chefsBackEnd-virtualenv/lib/python3.8/site-packages/django/apps/registry.py",
> line 91, in populate 2020-07-10 22:25:10,125:     app_config =
> AppConfig.create(entry) 2020-07-10 22:25:10,125:  2020-07-10
> 22:25:10,126:   File
> "/home/jgartsu12/.virtualenvs/chefsBackEnd-virtualenv/lib/python3.8/site-packages/django/apps/config.py",
> line 136, in create 2020-07-10 22:25:10,126:     import_module(entry)

【问题讨论】：

如果你在你的 virtualenv 中启动一个 bash 控制台（使用 PythonAnywhere 中“Web”页面上的链接），然后运行pip show django，它会显示什么？
@GilesThomas 它显示：名称：Django 3.08。但是，问题与文件系统的路径有关。检查下面的答案！感谢您的帮助！
好的，很高兴听到您找到了解决方案！

标签： python rest django-rest-framework pythonanywhere

【解决方案1】：

文件的排列方式导致程序无法找到给定的模块。为了解决这个问题，我不得不把我的代码直接放到 PythonAnywhere.com 上。现在，我的 api 已经启动并运行了。jgartsu12.pythonanywhere.com

【讨论】：