diff --git a/rest_framework/filters.py b/rest_framework/filters.py
index 709225364..3586de22a 100644
--- a/rest_framework/filters.py
+++ b/rest_framework/filters.py
@@ -3,7 +3,6 @@ Provides generic filtering backends that can be used to filter the results
 returned by list views.
 """
 import operator
-import warnings
 from functools import reduce
 
 from django.core.exceptions import FieldDoesNotExist, ImproperlyConfigured
@@ -14,8 +13,6 @@ from django.utils.encoding import force_str
 from django.utils.text import smart_split, unescape_string_literal
 from django.utils.translation import gettext_lazy as _
 
-from rest_framework import RemovedInDRF317Warning
-from rest_framework.compat import coreapi, coreschema
 from rest_framework.fields import CharField
 from rest_framework.settings import api_settings
 
@@ -256,9 +253,9 @@ class OrderingFilter(BaseFilterBackend):
             (field.source.replace('.', '__') or field_name, field.label)
             for field_name, field in serializer_class(context=context).fields.items()
             if (
-                    not getattr(field, 'write_only', False) and
-                    not field.source == '*' and
-                    field.source not in model_property_names
+                not getattr(field, 'write_only', False) and
+                not field.source == '*' and
+                field.source not in model_property_names
             )
         ]
 
diff --git a/rest_framework/pagination.py b/rest_framework/pagination.py
index fbd47f9f4..164d7c2f8 100644
--- a/rest_framework/pagination.py
+++ b/rest_framework/pagination.py
@@ -4,7 +4,6 @@ be used for paginated responses.
 """
 
 import contextlib
-import warnings
 from base64 import b64decode, b64encode
 from collections import namedtuple
 from urllib import parse
@@ -15,8 +14,6 @@ from django.template import loader
 from django.utils.encoding import force_str
 from django.utils.translation import gettext_lazy as _
 
-from rest_framework import RemovedInDRF317Warning
-from rest_framework.compat import coreapi, coreschema
 from rest_framework.exceptions import NotFound
 from rest_framework.response import Response
 from rest_framework.settings import api_settings
diff --git a/rest_framework/schemas/coreapi.py b/rest_framework/schemas/coreapi.py
index 648008b7a..2733e4fdd 100644
--- a/rest_framework/schemas/coreapi.py
+++ b/rest_framework/schemas/coreapi.py
@@ -1,17 +1,10 @@
-import warnings
 from collections import Counter
-from urllib import parse
 
 from django.db import models
 from django.utils.encoding import force_str
 
-from rest_framework import RemovedInDRF317Warning, exceptions, serializers
-from rest_framework.compat import coreapi, coreschema, uritemplate
-from rest_framework.settings import api_settings
-
-from .generators import BaseSchemaGenerator
-from .inspectors import ViewInspector
-from .utils import get_pk_description, is_list_view
+from rest_framework import serializers
+from rest_framework.compat import coreschema
 
 
 def common_path(paths):
@@ -186,6 +179,3 @@ def field_to_schema(field):
         )
 
     return coreschema.String(title=title, description=description)
-
-
-å