Module "django.core.cache.backends.memcached" does not define a "PyMemcacheCache" attribute/class

[VISHESH MANGLA]

Hello,

Please help with the following error

settings.py

CACHES = {

    "default": {

         'BACKEND': 'django.core.cache.backends.memcached.PyMemcacheCache',

        'LOCATION': '127.0.0.1:11211'

    }

}

#CACHE_MIDDLEWARE_ALIAS = "teut_cache"

#CACHE_MIDDLEWARE_SECONDS = 500

#CACHE_MIDDLEWARE_KEY_PREFIX  = ...

# Set the cache backend to select2

SELECT2_CACHE_BACKEND = "default"

Error logs:

(venv) PS C:\Users\Dell\OneDrive\Desktop\office\djangodev\massservices> python manage.py runserver
Watching for file changes with StatReloader
Performing system checks...

Exception in thread django-main-thread:
Traceback (most recent call last):
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\utils\module_loading.py", line 20, in import_string
    return getattr(module, class_name)
AttributeError: module 'django.core.cache.backends.memcached' has no attribute 'PyMemcacheCache'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\core\cache\__init__.py", line 50, in _create_cache
    backend_cls = import_string(backend)
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\utils\module_loading.py", line 22, in import_string
    raise ImportError('Module "%s" does not define a "%s" attribute/class' % (
ImportError: Module "django.core.cache.backends.memcached" does not define a "PyMemcacheCache" attribute/class

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\python38\lib\threading.py", line 932, in _bootstrap_inner
    self.run()
  File "c:\python38\lib\threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\utils\autoreload.py", line 53, in wrapper      
    fn(*args, **kwargs)
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\core\management\commands\runserver.py", line 118, in inner_run
    self.check(display_num_errors=True)
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\core\management\base.py", line 392, in check   
    all_issues = checks.run_checks(
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\core\checks\registry.py", line 70, in run_checks
    new_errors = check(app_configs=app_configs, databases=databases)
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\core\checks\urls.py", line 13, in check_url_config
    return check_resolver(resolver)
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\core\checks\urls.py", line 23, in check_resolver
    return check_method()
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\urls\resolvers.py", line 408, in check
    for pattern in self.url_patterns:
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\utils\functional.py", line 48, in __get__      
    res = instance.__dict__[self.name] = self.func(instance)
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\urls\resolvers.py", line 589, in url_patterns  
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\utils\functional.py", line 48, in __get__      
    res = instance.__dict__[self.name] = self.func(instance)
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\urls\resolvers.py", line 582, in urlconf_module    return import_module(self.urlconf_name)
  File "c:\python38\lib\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 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\massservices\massservices\urls.py", line 7, in <module>
    path("select2/", include("django_select2.urls")),
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\urls\conf.py", line 34, in include
    urlconf_module = import_module(urlconf_module)
  File "c:\python38\lib\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 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django_select2\urls.py", line 14, in <module>
    from .views import AutoResponseView
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django_select2\views.py", line 7, in <module>
    from .cache import cache
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django_select2\cache.py", line 20, in <module>
    cache = caches[settings.SELECT2_CACHE_BACKEND]
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\core\cache\__init__.py", line 79, in __getitem__
    cache = _create_cache(alias)
  File "C:\Users\Dell\OneDrive\Desktop\office\djangodev\venv\lib\site-packages\django\core\cache\__init__.py", line 52, in _create_cache
    raise InvalidCacheBackendError(
django.core.cache.backends.base.InvalidCacheBackendError: Could not find backend 'django.core.cache.backends.memcached.PyMemcacheCache': Module "django.core.cache.backends.memcached" does not define a "PyMemcacheCache" attribute/class

[Jacob Greene]

Looks like only django 3.2 uses PyMemcacheCache.

Try:

"django.core.cache.backends.memcached.MemcachedCache"

Also, make sure you are using the docs for the correct version of django:

For example:

https://docs.djangoproject.com/en/3.0/topics/cache/

instead of: 

https://docs.djangoproject.com/en/3.2/topics/cache/

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[VISHESH MANGLA]

Thanks for the help. That was the problem, I had django 3.0. I just upgraded it.