We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
No reverse match for rest_framework namespace
The error for a very strange reason shows when accessing these URLs:
https://github.com/swcarpentry/amy/blob/develop/api/urls.py#L57

I wasn't able to get rid of it; it's not being used at all, so maybe it should be removed…?


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `api/urls.py`
Content:
```
1 from django.conf.urls import url, include
2 from rest_framework_nested import routers
3 from rest_framework.urlpatterns import format_suffix_patterns
4 
5 from . import views
6 
7 # new in Django 1.9: this defines a namespace for URLs; there's no need for
8 # `namespace='api'` in the include()
9 app_name = 'api'
10 
11 # routers generate URLs for methods like `.list` or `.retrieve`
12 router = routers.SimpleRouter()
13 router.register('reports', views.ReportsViewSet, base_name='reports')
14 router.register('persons', views.PersonViewSet)
15 awards_router = routers.NestedSimpleRouter(router, 'persons', lookup='person')
16 awards_router.register('awards', views.AwardViewSet, base_name='person-awards')
17 person_task_router = routers.NestedSimpleRouter(router, 'persons',
18                                                 lookup='person')
19 person_task_router.register('tasks', views.PersonTaskViewSet,
20                             base_name='person-tasks')
21 router.register('events', views.EventViewSet)
22 tasks_router = routers.NestedSimpleRouter(router, 'events', lookup='event')
23 tasks_router.register('tasks', views.TaskViewSet, base_name='event-tasks')
24 todos_router = routers.NestedSimpleRouter(router, 'events', lookup='event')
25 todos_router.register('todos', views.TodoViewSet, base_name='event-todos')
26 router.register('hosts', views.HostViewSet)
27 router.register('airports', views.AirportViewSet)
28 
29 urlpatterns = [
30     url('^$', views.ApiRoot.as_view(), name='root'),
31     # TODO: turn these export views into ViewSets and add them to the router
32     url('^export/badges/$',
33         views.ExportBadgesView.as_view(),
34         name='export-badges'),
35     url('^export/instructors/$',
36         views.ExportInstructorLocationsView.as_view(),
37         name='export-instructors'),
38     url('^export/members/$',
39         views.ExportMembersView.as_view(),
40         name='export-members'),
41     url('^events/published/$',
42         views.PublishedEvents.as_view(),
43         name='events-published'),
44     url('^todos/user/$',
45         views.UserTodoItems.as_view(),
46         name='user-todos'),
47 
48     url('^', include(router.urls)),
49     url('^', include(awards_router.urls)),
50     url('^', include(person_task_router.urls)),
51     url('^', include(tasks_router.urls)),
52     url('^', include(todos_router.urls)),
53 ]
54 
55 # for login-logout functionality
56 urlpatterns += [
57     url(r'^api-auth/',
58         include('rest_framework.urls', namespace='rest_framework')),
59 ]
60 
61 urlpatterns = format_suffix_patterns(urlpatterns)  # allow to specify format
62
```
--- 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/api/urls.py b/api/urls.py
--- a/api/urls.py
+++ b/api/urls.py
@@ -52,10 +52,4 @@
     url('^', include(todos_router.urls)),
 ]
 
-# for login-logout functionality
-urlpatterns += [
-    url(r'^api-auth/',
-        include('rest_framework.urls', namespace='rest_framework')),
-]
-
 urlpatterns = format_suffix_patterns(urlpatterns)  # allow to specify format

{"golden_diff": "diff --git a/api/urls.py b/api/urls.py\n--- a/api/urls.py\n+++ b/api/urls.py\n@@ -52,10 +52,4 @@\n     url('^', include(todos_router.urls)),\n ]\n \n-# for login-logout functionality\n-urlpatterns += [\n-    url(r'^api-auth/',\n-        include('rest_framework.urls', namespace='rest_framework')),\n-]\n-\n urlpatterns = format_suffix_patterns(urlpatterns)  # allow to specify format\n", "issue": "No reverse match for rest_framework namespace\nThe error for a very strange reason shows when accessing these URLs:\nhttps://github.com/swcarpentry/amy/blob/develop/api/urls.py#L57\n\nI wasn't able to get rid of it; it's not being used at all, so maybe it should be removed\u2026?\n\n", "before_files": [{"content": "from django.conf.urls import url, include\nfrom rest_framework_nested import routers\nfrom rest_framework.urlpatterns import format_suffix_patterns\n\nfrom . import views\n\n# new in Django 1.9: this defines a namespace for URLs; there's no need for\n# `namespace='api'` in the include()\napp_name = 'api'\n\n# routers generate URLs for methods like `.list` or `.retrieve`\nrouter = routers.SimpleRouter()\nrouter.register('reports', views.ReportsViewSet, base_name='reports')\nrouter.register('persons', views.PersonViewSet)\nawards_router = routers.NestedSimpleRouter(router, 'persons', lookup='person')\nawards_router.register('awards', views.AwardViewSet, base_name='person-awards')\nperson_task_router = routers.NestedSimpleRouter(router, 'persons',\n                                                lookup='person')\nperson_task_router.register('tasks', views.PersonTaskViewSet,\n                            base_name='person-tasks')\nrouter.register('events', views.EventViewSet)\ntasks_router = routers.NestedSimpleRouter(router, 'events', lookup='event')\ntasks_router.register('tasks', views.TaskViewSet, base_name='event-tasks')\ntodos_router = routers.NestedSimpleRouter(router, 'events', lookup='event')\ntodos_router.register('todos', views.TodoViewSet, base_name='event-todos')\nrouter.register('hosts', views.HostViewSet)\nrouter.register('airports', views.AirportViewSet)\n\nurlpatterns = [\n    url('^$', views.ApiRoot.as_view(), name='root'),\n    # TODO: turn these export views into ViewSets and add them to the router\n    url('^export/badges/$',\n        views.ExportBadgesView.as_view(),\n        name='export-badges'),\n    url('^export/instructors/$',\n        views.ExportInstructorLocationsView.as_view(),\n        name='export-instructors'),\n    url('^export/members/$',\n        views.ExportMembersView.as_view(),\n        name='export-members'),\n    url('^events/published/$',\n        views.PublishedEvents.as_view(),\n        name='events-published'),\n    url('^todos/user/$',\n        views.UserTodoItems.as_view(),\n        name='user-todos'),\n\n    url('^', include(router.urls)),\n    url('^', include(awards_router.urls)),\n    url('^', include(person_task_router.urls)),\n    url('^', include(tasks_router.urls)),\n    url('^', include(todos_router.urls)),\n]\n\n# for login-logout functionality\nurlpatterns += [\n    url(r'^api-auth/',\n        include('rest_framework.urls', namespace='rest_framework')),\n]\n\nurlpatterns = format_suffix_patterns(urlpatterns)  # allow to specify format\n", "path": "api/urls.py"}], "after_files": [{"content": "from django.conf.urls import url, include\nfrom rest_framework_nested import routers\nfrom rest_framework.urlpatterns import format_suffix_patterns\n\nfrom . import views\n\n# new in Django 1.9: this defines a namespace for URLs; there's no need for\n# `namespace='api'` in the include()\napp_name = 'api'\n\n# routers generate URLs for methods like `.list` or `.retrieve`\nrouter = routers.SimpleRouter()\nrouter.register('reports', views.ReportsViewSet, base_name='reports')\nrouter.register('persons', views.PersonViewSet)\nawards_router = routers.NestedSimpleRouter(router, 'persons', lookup='person')\nawards_router.register('awards', views.AwardViewSet, base_name='person-awards')\nperson_task_router = routers.NestedSimpleRouter(router, 'persons',\n                                                lookup='person')\nperson_task_router.register('tasks', views.PersonTaskViewSet,\n                            base_name='person-tasks')\nrouter.register('events', views.EventViewSet)\ntasks_router = routers.NestedSimpleRouter(router, 'events', lookup='event')\ntasks_router.register('tasks', views.TaskViewSet, base_name='event-tasks')\ntodos_router = routers.NestedSimpleRouter(router, 'events', lookup='event')\ntodos_router.register('todos', views.TodoViewSet, base_name='event-todos')\nrouter.register('hosts', views.HostViewSet)\nrouter.register('airports', views.AirportViewSet)\n\nurlpatterns = [\n    url('^$', views.ApiRoot.as_view(), name='root'),\n    # TODO: turn these export views into ViewSets and add them to the router\n    url('^export/badges/$',\n        views.ExportBadgesView.as_view(),\n        name='export-badges'),\n    url('^export/instructors/$',\n        views.ExportInstructorLocationsView.as_view(),\n        name='export-instructors'),\n    url('^export/members/$',\n        views.ExportMembersView.as_view(),\n        name='export-members'),\n    url('^events/published/$',\n        views.PublishedEvents.as_view(),\n        name='events-published'),\n    url('^todos/user/$',\n        views.UserTodoItems.as_view(),\n        name='user-todos'),\n\n    url('^', include(router.urls)),\n    url('^', include(awards_router.urls)),\n    url('^', include(person_task_router.urls)),\n    url('^', include(tasks_router.urls)),\n    url('^', include(todos_router.urls)),\n]\n\nurlpatterns = format_suffix_patterns(urlpatterns)  # allow to specify format\n", "path": "api/urls.py"}]}