add linting stubs with flake8-pyi and check for unused imports (#186)

django-stubs/core/checks/caches.pyi

@@ -1,4 +1,4 @@
-from typing import Any, List, Optional
+from typing import Any, List
 
 from django.core.checks.messages import Error
 

django-stubs/core/checks/database.pyi

@@ -1,3 +1,3 @@
-from typing import Any, List, Optional
+from typing import Any, List
 
 def check_database_backends(*args: Any, **kwargs: Any) -> List[Any]: ...

django-stubs/core/checks/security/base.pyi

@@ -1,4 +1,4 @@
-from typing import Any, List, Optional
+from typing import Any, List
 
 from django.core.checks.messages import Warning
 

django-stubs/core/checks/security/csrf.pyi

@@ -1,4 +1,4 @@
-from typing import Any, List, Optional
+from typing import Any, List
 
 from django.core.checks.messages import Warning
 

django-stubs/core/checks/security/sessions.pyi

@@ -1,4 +1,4 @@
-from typing import Any, List, Optional
+from typing import Any, List
 
 from django.core.checks.messages import Warning
 

django-stubs/core/checks/templates.pyi

@@ -1,4 +1,4 @@
-from typing import Any, List, Optional
+from typing import Any, List
 
 from django.core.checks.messages import Error
 

django-stubs/core/checks/urls.pyi

@@ -1,4 +1,4 @@
-from typing import Any, Callable, List, Optional, Tuple, Union
+from typing import Any, Callable, List, Tuple, Union
 
 from django.core.checks.messages import CheckMessage, Error, Warning
 from django.urls.resolvers import URLPattern, URLResolver

django-stubs/core/files/uploadhandler.pyi

@@ -8,8 +8,8 @@ from django.utils.datastructures import MultiValueDict
 class UploadFileException(Exception): ...
 
 class StopUpload(UploadFileException):
-    connection_reset = ...  # type: bool
-    def __init__(self, connection_reset: bool = False) -> None: ...
+    connection_reset: bool = ...
+    def __init__(self, connection_reset: bool = ...) -> None: ...
 
 class SkipFile(UploadFileException): ...
 class StopFutureHandlers(UploadFileException): ...

django-stubs/core/management/color.pyi

@@ -1,5 +1,3 @@
-from collections import Callable
-
 def supports_color() -> bool: ...
 
 class Style:

django-stubs/core/management/commands/makemessages.pyi

@@ -1,13 +1,6 @@
-import os
-import re
-from typing import Any, Pattern, Type, Optional
+from typing import Any, Optional, Pattern, Type
 
 from django.core.management.base import BaseCommand
-from django.utils.functional import cached_property
-from django.utils.jslex import prepare_js_for_gettext
-
-from django.conf import settings
-from django.utils.translation import templatize
 
 plural_forms_re: Pattern = ...
 STATUS_OK: int = ...

django-stubs/core/paginator.pyi

@@ -1,4 +1,4 @@
-from typing import Dict, List, Optional, Union, Iterable, Sequence, Protocol, Any
+from typing import Dict, List, Optional, Protocol, Sequence, Union
 
 from django.db.models.base import Model
 from django.db.models.query import QuerySet

django-stubs/core/servers/basehttp.pyi

@@ -4,7 +4,7 @@ from typing import Any, Dict
 from wsgiref import simple_server
 
 from django.core.handlers.wsgi import WSGIRequest, WSGIHandler
-from django.core.wsgi import get_wsgi_application as get_wsgi_application
+from django.core.wsgi import get_wsgi_application as get_wsgi_application  # noqa: F401
 
 class WSGIServer(simple_server.WSGIServer):
     request_queue_size: int = ...

django-stubs/core/signing.pyi

@@ -1,7 +1,5 @@
-from datetime import datetime, timedelta
-from typing import Any, Dict, List, Optional, Type, Union, Protocol
-
-from django.contrib.sessions.serializers import PickleSerializer
+from datetime import timedelta
+from typing import Any, Dict, Optional, Protocol, Type, Union
 
 class BadSignature(Exception): ...
 class SignatureExpired(BadSignature): ...

django-stubs/core/validators.pyi

@@ -5,7 +5,7 @@ from typing import Any, Dict, List, Optional, Union, Pattern, Collection
 from uuid import UUID
 
 from django.core.files.base import File
-from django.core.exceptions import ValidationError as ValidationError
+from django.core.exceptions import ValidationError as ValidationError  # noqa: F401
 
 EMPTY_VALUES: Any