We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
No module named 'django.utils.importlib' (Django dev)
In mongoengine/django/mongo_auth/models.py
See https://github.com/django/django/tree/master/django/utils

No module named 'django.utils.importlib' (Django dev)
In mongoengine/django/mongo_auth/models.py
See https://github.com/django/django/tree/master/django/utils


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `mongoengine/django/mongo_auth/models.py`
Content:
```
1 from django.conf import settings
2 from django.contrib.auth.hashers import make_password
3 from django.contrib.auth.models import UserManager
4 from django.core.exceptions import ImproperlyConfigured
5 from django.db import models
6 from django.utils.importlib import import_module
7 from django.utils.translation import ugettext_lazy as _
8 
9 
10 __all__ = (
11     'get_user_document',
12 )
13 
14 
15 MONGOENGINE_USER_DOCUMENT = getattr(
16     settings, 'MONGOENGINE_USER_DOCUMENT', 'mongoengine.django.auth.User')
17 
18 
19 def get_user_document():
20     """Get the user document class used for authentication.
21 
22     This is the class defined in settings.MONGOENGINE_USER_DOCUMENT, which
23     defaults to `mongoengine.django.auth.User`.
24 
25     """
26 
27     name = MONGOENGINE_USER_DOCUMENT
28     dot = name.rindex('.')
29     module = import_module(name[:dot])
30     return getattr(module, name[dot + 1:])
31 
32 
33 class MongoUserManager(UserManager):
34     """A User manager wich allows the use of MongoEngine documents in Django.
35 
36     To use the manager, you must tell django.contrib.auth to use MongoUser as
37     the user model. In you settings.py, you need:
38 
39         INSTALLED_APPS = (
40             ...
41             'django.contrib.auth',
42             'mongoengine.django.mongo_auth',
43             ...
44         )
45         AUTH_USER_MODEL = 'mongo_auth.MongoUser'
46 
47     Django will use the model object to access the custom Manager, which will
48     replace the original queryset with MongoEngine querysets.
49 
50     By default, mongoengine.django.auth.User will be used to store users. You
51     can specify another document class in MONGOENGINE_USER_DOCUMENT in your
52     settings.py.
53 
54     The User Document class has the same requirements as a standard custom user
55     model: https://docs.djangoproject.com/en/dev/topics/auth/customizing/
56 
57     In particular, the User Document class must define USERNAME_FIELD and
58     REQUIRED_FIELDS.
59 
60     `AUTH_USER_MODEL` has been added in Django 1.5.
61 
62     """
63 
64     def contribute_to_class(self, model, name):
65         super(MongoUserManager, self).contribute_to_class(model, name)
66         self.dj_model = self.model
67         self.model = get_user_document()
68 
69         self.dj_model.USERNAME_FIELD = self.model.USERNAME_FIELD
70         username = models.CharField(_('username'), max_length=30, unique=True)
71         username.contribute_to_class(self.dj_model, self.dj_model.USERNAME_FIELD)
72 
73         self.dj_model.REQUIRED_FIELDS = self.model.REQUIRED_FIELDS
74         for name in self.dj_model.REQUIRED_FIELDS:
75             field = models.CharField(_(name), max_length=30)
76             field.contribute_to_class(self.dj_model, name)
77 
78 
79     def get(self, *args, **kwargs):
80         try:
81             return self.get_query_set().get(*args, **kwargs)
82         except self.model.DoesNotExist:
83             # ModelBackend expects this exception
84             raise self.dj_model.DoesNotExist
85 
86     @property
87     def db(self):
88         raise NotImplementedError
89 
90     def get_empty_query_set(self):
91         return self.model.objects.none()
92 
93     def get_query_set(self):
94         return self.model.objects
95 
96 
97 class MongoUser(models.Model):
98     """"Dummy user model for Django.
99 
100     MongoUser is used to replace Django's UserManager with MongoUserManager.
101     The actual user document class is mongoengine.django.auth.User or any
102     other document class specified in MONGOENGINE_USER_DOCUMENT.
103 
104     To get the user document class, use `get_user_document()`.
105 
106     """
107 
108     objects = MongoUserManager()
109 
110     class Meta:
111         app_label = 'mongo_auth'
112 
113     def set_password(self, password):
114         """Doesn't do anything, but works around the issue with Django 1.6."""
115         make_password(password)
116
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/mongoengine/django/mongo_auth/models.py b/mongoengine/django/mongo_auth/models.py
--- a/mongoengine/django/mongo_auth/models.py
+++ b/mongoengine/django/mongo_auth/models.py
@@ -3,7 +3,11 @@
 from django.contrib.auth.models import UserManager
 from django.core.exceptions import ImproperlyConfigured
 from django.db import models
-from django.utils.importlib import import_module
+try:
+    from django.utils.module_loading import import_module
+except ImportError:
+    """Handle older versions of Django"""
+    from django.utils.importlib import import_module
 from django.utils.translation import ugettext_lazy as _

{"golden_diff": "diff --git a/mongoengine/django/mongo_auth/models.py b/mongoengine/django/mongo_auth/models.py\n--- a/mongoengine/django/mongo_auth/models.py\n+++ b/mongoengine/django/mongo_auth/models.py\n@@ -3,7 +3,11 @@\n from django.contrib.auth.models import UserManager\n from django.core.exceptions import ImproperlyConfigured\n from django.db import models\n-from django.utils.importlib import import_module\n+try:\n+    from django.utils.module_loading import import_module\n+except ImportError:\n+    \"\"\"Handle older versions of Django\"\"\"\n+    from django.utils.importlib import import_module\n from django.utils.translation import ugettext_lazy as _\n", "issue": "No module named 'django.utils.importlib' (Django dev)\nIn mongoengine/django/mongo_auth/models.py\nSee https://github.com/django/django/tree/master/django/utils\n\nNo module named 'django.utils.importlib' (Django dev)\nIn mongoengine/django/mongo_auth/models.py\nSee https://github.com/django/django/tree/master/django/utils\n\n", "before_files": [{"content": "from django.conf import settings\nfrom django.contrib.auth.hashers import make_password\nfrom django.contrib.auth.models import UserManager\nfrom django.core.exceptions import ImproperlyConfigured\nfrom django.db import models\nfrom django.utils.importlib import import_module\nfrom django.utils.translation import ugettext_lazy as _\n\n\n__all__ = (\n    'get_user_document',\n)\n\n\nMONGOENGINE_USER_DOCUMENT = getattr(\n    settings, 'MONGOENGINE_USER_DOCUMENT', 'mongoengine.django.auth.User')\n\n\ndef get_user_document():\n    \"\"\"Get the user document class used for authentication.\n\n    This is the class defined in settings.MONGOENGINE_USER_DOCUMENT, which\n    defaults to `mongoengine.django.auth.User`.\n\n    \"\"\"\n\n    name = MONGOENGINE_USER_DOCUMENT\n    dot = name.rindex('.')\n    module = import_module(name[:dot])\n    return getattr(module, name[dot + 1:])\n\n\nclass MongoUserManager(UserManager):\n    \"\"\"A User manager wich allows the use of MongoEngine documents in Django.\n\n    To use the manager, you must tell django.contrib.auth to use MongoUser as\n    the user model. In you settings.py, you need:\n\n        INSTALLED_APPS = (\n            ...\n            'django.contrib.auth',\n            'mongoengine.django.mongo_auth',\n            ...\n        )\n        AUTH_USER_MODEL = 'mongo_auth.MongoUser'\n\n    Django will use the model object to access the custom Manager, which will\n    replace the original queryset with MongoEngine querysets.\n\n    By default, mongoengine.django.auth.User will be used to store users. You\n    can specify another document class in MONGOENGINE_USER_DOCUMENT in your\n    settings.py.\n\n    The User Document class has the same requirements as a standard custom user\n    model: https://docs.djangoproject.com/en/dev/topics/auth/customizing/\n\n    In particular, the User Document class must define USERNAME_FIELD and\n    REQUIRED_FIELDS.\n\n    `AUTH_USER_MODEL` has been added in Django 1.5.\n\n    \"\"\"\n\n    def contribute_to_class(self, model, name):\n        super(MongoUserManager, self).contribute_to_class(model, name)\n        self.dj_model = self.model\n        self.model = get_user_document()\n\n        self.dj_model.USERNAME_FIELD = self.model.USERNAME_FIELD\n        username = models.CharField(_('username'), max_length=30, unique=True)\n        username.contribute_to_class(self.dj_model, self.dj_model.USERNAME_FIELD)\n\n        self.dj_model.REQUIRED_FIELDS = self.model.REQUIRED_FIELDS\n        for name in self.dj_model.REQUIRED_FIELDS:\n            field = models.CharField(_(name), max_length=30)\n            field.contribute_to_class(self.dj_model, name)\n\n\n    def get(self, *args, **kwargs):\n        try:\n            return self.get_query_set().get(*args, **kwargs)\n        except self.model.DoesNotExist:\n            # ModelBackend expects this exception\n            raise self.dj_model.DoesNotExist\n\n    @property\n    def db(self):\n        raise NotImplementedError\n\n    def get_empty_query_set(self):\n        return self.model.objects.none()\n\n    def get_query_set(self):\n        return self.model.objects\n\n\nclass MongoUser(models.Model):\n    \"\"\"\"Dummy user model for Django.\n\n    MongoUser is used to replace Django's UserManager with MongoUserManager.\n    The actual user document class is mongoengine.django.auth.User or any\n    other document class specified in MONGOENGINE_USER_DOCUMENT.\n\n    To get the user document class, use `get_user_document()`.\n\n    \"\"\"\n\n    objects = MongoUserManager()\n\n    class Meta:\n        app_label = 'mongo_auth'\n\n    def set_password(self, password):\n        \"\"\"Doesn't do anything, but works around the issue with Django 1.6.\"\"\"\n        make_password(password)\n", "path": "mongoengine/django/mongo_auth/models.py"}], "after_files": [{"content": "from django.conf import settings\nfrom django.contrib.auth.hashers import make_password\nfrom django.contrib.auth.models import UserManager\nfrom django.core.exceptions import ImproperlyConfigured\nfrom django.db import models\ntry:\n    from django.utils.module_loading import import_module\nexcept ImportError:\n    \"\"\"Handle older versions of Django\"\"\"\n    from django.utils.importlib import import_module\nfrom django.utils.translation import ugettext_lazy as _\n\n\n__all__ = (\n    'get_user_document',\n)\n\n\nMONGOENGINE_USER_DOCUMENT = getattr(\n    settings, 'MONGOENGINE_USER_DOCUMENT', 'mongoengine.django.auth.User')\n\n\ndef get_user_document():\n    \"\"\"Get the user document class used for authentication.\n\n    This is the class defined in settings.MONGOENGINE_USER_DOCUMENT, which\n    defaults to `mongoengine.django.auth.User`.\n\n    \"\"\"\n\n    name = MONGOENGINE_USER_DOCUMENT\n    dot = name.rindex('.')\n    module = import_module(name[:dot])\n    return getattr(module, name[dot + 1:])\n\n\nclass MongoUserManager(UserManager):\n    \"\"\"A User manager wich allows the use of MongoEngine documents in Django.\n\n    To use the manager, you must tell django.contrib.auth to use MongoUser as\n    the user model. In you settings.py, you need:\n\n        INSTALLED_APPS = (\n            ...\n            'django.contrib.auth',\n            'mongoengine.django.mongo_auth',\n            ...\n        )\n        AUTH_USER_MODEL = 'mongo_auth.MongoUser'\n\n    Django will use the model object to access the custom Manager, which will\n    replace the original queryset with MongoEngine querysets.\n\n    By default, mongoengine.django.auth.User will be used to store users. You\n    can specify another document class in MONGOENGINE_USER_DOCUMENT in your\n    settings.py.\n\n    The User Document class has the same requirements as a standard custom user\n    model: https://docs.djangoproject.com/en/dev/topics/auth/customizing/\n\n    In particular, the User Document class must define USERNAME_FIELD and\n    REQUIRED_FIELDS.\n\n    `AUTH_USER_MODEL` has been added in Django 1.5.\n\n    \"\"\"\n\n    def contribute_to_class(self, model, name):\n        super(MongoUserManager, self).contribute_to_class(model, name)\n        self.dj_model = self.model\n        self.model = get_user_document()\n\n        self.dj_model.USERNAME_FIELD = self.model.USERNAME_FIELD\n        username = models.CharField(_('username'), max_length=30, unique=True)\n        username.contribute_to_class(self.dj_model, self.dj_model.USERNAME_FIELD)\n\n        self.dj_model.REQUIRED_FIELDS = self.model.REQUIRED_FIELDS\n        for name in self.dj_model.REQUIRED_FIELDS:\n            field = models.CharField(_(name), max_length=30)\n            field.contribute_to_class(self.dj_model, name)\n\n\n    def get(self, *args, **kwargs):\n        try:\n            return self.get_query_set().get(*args, **kwargs)\n        except self.model.DoesNotExist:\n            # ModelBackend expects this exception\n            raise self.dj_model.DoesNotExist\n\n    @property\n    def db(self):\n        raise NotImplementedError\n\n    def get_empty_query_set(self):\n        return self.model.objects.none()\n\n    def get_query_set(self):\n        return self.model.objects\n\n\nclass MongoUser(models.Model):\n    \"\"\"\"Dummy user model for Django.\n\n    MongoUser is used to replace Django's UserManager with MongoUserManager.\n    The actual user document class is mongoengine.django.auth.User or any\n    other document class specified in MONGOENGINE_USER_DOCUMENT.\n\n    To get the user document class, use `get_user_document()`.\n\n    \"\"\"\n\n    objects = MongoUserManager()\n\n    class Meta:\n        app_label = 'mongo_auth'\n\n    def set_password(self, password):\n        \"\"\"Doesn't do anything, but works around the issue with Django 1.6.\"\"\"\n        make_password(password)\n", "path": "mongoengine/django/mongo_auth/models.py"}]}