diff --git a/datasette/app.py b/datasette/app.py
index 6a6a60b2..5e4be23b 100644
--- a/datasette/app.py
+++ b/datasette/app.py
@@ -2,7 +2,10 @@ from __future__ import annotations
 
 from asgi_csrf import Errors
 import asyncio
-from typing import Any, Dict, Iterable, List
+from typing import TYPE_CHECKING, Any, Dict, Iterable, List
+
+if TYPE_CHECKING:
+    from datasette.permissions import AllowedResource, Resource
 import asgi_csrf
 import collections
 import dataclasses
@@ -117,8 +120,7 @@ from .tracer import AsgiTracer
 from .plugins import pm, DEFAULT_PLUGINS, get_plugins
 from .version import __version__
 
-from .permissions import PermissionSQL
-from .resources import InstanceResource, DatabaseResource, TableResource
+from .resources import DatabaseResource, TableResource
 
 app_root = Path(__file__).parent.parent
 
@@ -1176,7 +1178,6 @@ class Datasette:
                 if table.private:
                     print(f"{table.child} is private")
         """
-        from datasette.permissions import Resource
 
         action_obj = self.actions.get(action)
         if not action_obj:
@@ -1217,7 +1218,7 @@ class Datasette:
             for allowed in debug_info:
                 print(f"{allowed.resource}: {allowed.reason}")
         """
-        from datasette.permissions import AllowedResource, Resource
+        from datasette.permissions import AllowedResource
 
         action_obj = self.actions.get(action)
         if not action_obj:
@@ -1277,7 +1278,6 @@ class Datasette:
         """
         from datasette.utils.actions_sql import check_permission_for_resource
         from datasette.resources import InstanceResource
-        import datetime
 
         if resource is None:
             resource = InstanceResource()
diff --git a/datasette/cli.py b/datasette/cli.py
index 9606a9a0..24d87279 100644
--- a/datasette/cli.py
+++ b/datasette/cli.py
@@ -146,7 +146,6 @@ def inspect(files, inspect_file, sqlite_extensions):
     This can then be passed to "datasette --inspect-file" to speed up count
     operations against immutable database files.
     """
-    app = Datasette([], immutables=files, sqlite_extensions=sqlite_extensions)
     inspect_data = run_sync(lambda: inspect_(files, sqlite_extensions))
     if inspect_file == "-":
         sys.stdout.write(json.dumps(inspect_data, indent=2))
diff --git a/datasette/default_permissions.py b/datasette/default_permissions.py
index 3ad84a6d..32164260 100644
--- a/datasette/default_permissions.py
+++ b/datasette/default_permissions.py
@@ -1,3 +1,10 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from datasette.app import Datasette
+
 from datasette import hookimpl
 from datasette.permissions import PermissionSQL
 from datasette.utils import actor_matches_allow
diff --git a/datasette/events.py b/datasette/events.py
index 88f90129..5cd5ba3d 100644
--- a/datasette/events.py
+++ b/datasette/events.py
@@ -2,7 +2,6 @@ from abc import ABC, abstractproperty
 from dataclasses import asdict, dataclass, field
 from datasette.hookspecs import hookimpl
 from datetime import datetime, timezone
-from typing import Optional
 
 
 @dataclass
diff --git a/datasette/filters.py b/datasette/filters.py
index 795f472b..95cc5f37 100644
--- a/datasette/filters.py
+++ b/datasette/filters.py
@@ -3,7 +3,6 @@ from datasette.resources import DatabaseResource
 from datasette.views.base import DatasetteError
 from datasette.utils.asgi import BadRequest
 import json
-import numbers
 from .utils import detect_json1, escape_sqlite, path_with_removed_args
 
 
diff --git a/datasette/permissions.py b/datasette/permissions.py
index 0f691405..42811aa0 100644
--- a/datasette/permissions.py
+++ b/datasette/permissions.py
@@ -1,6 +1,6 @@
 from abc import ABC, abstractmethod
 from dataclasses import dataclass
-from typing import Any, Dict, Optional, NamedTuple
+from typing import Any, Dict, NamedTuple
 
 
 class Resource(ABC):
diff --git a/datasette/plugins.py b/datasette/plugins.py
index 288c536b..392ab60d 100644
--- a/datasette/plugins.py
+++ b/datasette/plugins.py
@@ -50,7 +50,7 @@ def after(outcome, hook_name, hook_impls, kwargs):
     results = outcome.get_result()
     if not isinstance(results, list):
         results = [results]
-    print(f"Results:", file=sys.stderr)
+    print("Results:", file=sys.stderr)
     pprint(results, width=40, indent=4, stream=sys.stderr)
 
 
diff --git a/datasette/renderer.py b/datasette/renderer.py
index 483c81e9..acf23e59 100644
--- a/datasette/renderer.py
+++ b/datasette/renderer.py
@@ -20,7 +20,7 @@ def convert_specific_columns_to_json(rows, columns, json_cols):
             if column in json_cols:
                 try:
                     value = json.loads(value)
-                except (TypeError, ValueError) as e:
+                except (TypeError, ValueError):
                     pass
             new_row.append(value)
         new_rows.append(new_row)
diff --git a/datasette/utils/asgi.py b/datasette/utils/asgi.py
index 1699847e..40214cbe 100644
--- a/datasette/utils/asgi.py
+++ b/datasette/utils/asgi.py
@@ -1,4 +1,3 @@
-import hashlib
 import json
 from datasette.utils import MultiParams, calculate_etag
 from mimetypes import guess_type
diff --git a/datasette/views/database.py b/datasette/views/database.py
index 15eb271d..41eb4c57 100644
--- a/datasette/views/database.py
+++ b/datasette/views/database.py
@@ -9,7 +9,6 @@ import os
 import re
 import sqlite_utils
 import textwrap
-from typing import List
 
 from datasette.events import AlterTableEvent, CreateTableEvent, InsertRowsEvent
 from datasette.database import QueryInterrupted
@@ -71,7 +70,6 @@ class DatabaseView(View):
         metadata = await datasette.get_database_metadata(database)
 
         # Get all tables/views this actor can see in bulk with private flag
-        from datasette.resources import TableResource
 
         allowed_tables = await datasette.allowed_resources(
             "view-table", request.actor, parent=database, include_is_private=True
@@ -344,7 +342,6 @@ async def get_tables(datasette, request, db, allowed_dict):
         allowed_dict: Dict mapping table name -> Resource object with .private attribute
     """
     tables = []
-    database = db.name
     table_counts = await db.table_counts(100)
     hidden_table_names = set(await db.hidden_table_names())
     all_foreign_keys = await db.get_all_foreign_keys()
@@ -512,7 +509,6 @@ class QueryView(View):
         database = db.name
 
         # Get all tables/views this actor can see in bulk with private flag
-        from datasette.resources import TableResource
 
         allowed_tables = await datasette.allowed_resources(
             "view-table", request.actor, parent=database, include_is_private=True
diff --git a/datasette/views/index.py b/datasette/views/index.py
index a5758cf8..a6bfc4d9 100644
--- a/datasette/views/index.py
+++ b/datasette/views/index.py
@@ -1,6 +1,5 @@
 import json
 
-from datasette import Forbidden
 from datasette.plugins import pm
 from datasette.utils import (
     add_cors_headers,
diff --git a/datasette/views/row.py b/datasette/views/row.py
index 31d31bee..c9b74b12 100644
--- a/datasette/views/row.py
+++ b/datasette/views/row.py
@@ -247,7 +247,7 @@ class RowUpdateView(BaseView):
 
         if not isinstance(data, dict):
             return _error(["JSON must be a dictionary"])
-        if not "update" in data or not isinstance(data["update"], dict):
+        if "update" not in data or not isinstance(data["update"], dict):
             return _error(["JSON must contain an update dictionary"])
 
         invalid_keys = set(data.keys()) - {"update", "return", "alter"}
diff --git a/datasette/views/table.py b/datasette/views/table.py
index 3c7c976f..007c0c85 100644
--- a/datasette/views/table.py
+++ b/datasette/views/table.py
@@ -166,7 +166,6 @@ async def display_columns_and_rows(
     column_details = {
         col.name: col for col in await db.table_column_details(table_name)
     }
-    table_config = await datasette.table_config(database_name, table_name)
     pks = await db.primary_keys(table_name)
     pks_for_display = pks
     if not pks_for_display:
diff --git a/tests/conftest.py b/tests/conftest.py
index 6e00c5d8..4749fe6a 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -231,3 +231,27 @@ def ds_unix_domain_socket_server(tmp_path_factory):
     yield ds_proc, uds
     # Shut it down at the end of the pytest session
     ds_proc.terminate()
+
+
+# Import fixtures from fixtures.py to make them available
+from .fixtures import (  # noqa: E402, F401
+    app_client,
+    app_client_base_url_prefix,
+    app_client_conflicting_database_names,
+    app_client_csv_max_mb_one,
+    app_client_immutable_and_inspect_file,
+    app_client_larger_cache_size,
+    app_client_no_files,
+    app_client_returned_rows_matches_page_size,
+    app_client_shorter_time_limit,
+    app_client_two_attached_databases,
+    app_client_two_attached_databases_crossdb_enabled,
+    app_client_two_attached_databases_one_immutable,
+    app_client_with_cors,
+    app_client_with_dot,
+    app_client_with_trace,
+    generate_compound_rows,
+    generate_sortable_rows,
+    make_app_client,
+    TEMP_PLUGIN_SECRET_FILE,
+)
diff --git a/tests/test_api.py b/tests/test_api.py
index 84b33a09..31798668 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -1,6 +1,5 @@
 from datasette.app import Datasette
 from datasette.plugins import DEFAULT_PLUGINS
-from datasette.utils.sqlite import supports_table_xinfo
 from datasette.version import __version__
 from .fixtures import (  # noqa
     app_client,
diff --git a/tests/test_auth.py b/tests/test_auth.py
index 3b3be2fc..1e1cd622 100644
--- a/tests/test_auth.py
+++ b/tests/test_auth.py
@@ -1,5 +1,4 @@
 from bs4 import BeautifulSoup as Soup
-from .fixtures import app_client
 from .utils import cookie_was_deleted, last_event
 from click.testing import CliRunner
 from datasette.utils import baseconv
diff --git a/tests/test_canned_queries.py b/tests/test_canned_queries.py
index c84c8cdb..ed6202a4 100644
--- a/tests/test_canned_queries.py
+++ b/tests/test_canned_queries.py
@@ -2,7 +2,7 @@ from bs4 import BeautifulSoup as Soup
 import json
 import pytest
 import re
-from .fixtures import make_app_client, app_client
+from .fixtures import make_app_client
 
 
 @pytest.fixture
diff --git a/tests/test_cli.py b/tests/test_cli.py
index a18c8f09..537089ac 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -1,5 +1,4 @@
 from .fixtures import (
-    app_client,
     make_app_client,
     TestClient as _TestClient,
     EXPECTED_PLUGINS,
diff --git a/tests/test_crossdb.py b/tests/test_crossdb.py
index bc4eaf22..1ec1a05c 100644
--- a/tests/test_crossdb.py
+++ b/tests/test_crossdb.py
@@ -2,7 +2,6 @@ from datasette.cli import cli
 from click.testing import CliRunner
 import urllib
 import sqlite3
-from .fixtures import app_client_two_attached_databases_crossdb_enabled
 
 
 def test_crossdb_join(app_client_two_attached_databases_crossdb_enabled):
diff --git a/tests/test_html.py b/tests/test_html.py
index a6dc52c0..e6d3eb93 100644
--- a/tests/test_html.py
+++ b/tests/test_html.py
@@ -1,4 +1,3 @@
-from asgi_csrf import Errors
 from bs4 import BeautifulSoup as Soup
 from datasette.app import Datasette
 from datasette.utils import allowed_pragmas
diff --git a/tests/test_internals_database.py b/tests/test_internals_database.py
index 89a17047..4a078f75 100644
--- a/tests/test_internals_database.py
+++ b/tests/test_internals_database.py
@@ -6,7 +6,6 @@ from datasette.app import Datasette
 from datasette.database import Database, Results, MultipleValues
 from datasette.utils.sqlite import sqlite3, sqlite_version
 from datasette.utils import Column
-from .fixtures import app_client, app_client_two_attached_databases_crossdb_enabled
 import pytest
 import time
 import uuid
diff --git a/tests/test_internals_datasette.py b/tests/test_internals_datasette.py
index 629427b0..60bcfe25 100644
--- a/tests/test_internals_datasette.py
+++ b/tests/test_internals_datasette.py
@@ -3,7 +3,7 @@ Tests for the datasette.app.Datasette class
 """
 
 import dataclasses
-from datasette import Forbidden, Context
+from datasette import Context
 from datasette.app import Datasette, Database
 from datasette.resources import DatabaseResource
 from itsdangerous import BadSignature
diff --git a/tests/test_plugins.py b/tests/test_plugins.py
index 205c04bd..0460d9c8 100644
--- a/tests/test_plugins.py
+++ b/tests/test_plugins.py
@@ -1,6 +1,5 @@
 from bs4 import BeautifulSoup as Soup
 from .fixtures import (
-    app_client,
     make_app_client,
     TABLES,
     TEMP_PLUGIN_SECRET_FILE,
@@ -9,7 +8,7 @@ from .fixtures import (
 )  # noqa
 from click.testing import CliRunner
 from datasette.app import Datasette
-from datasette import cli, hookimpl, Permission
+from datasette import cli, hookimpl
 from datasette.filters import FilterArguments
 from datasette.plugins import get_plugins, DEFAULT_PLUGINS, pm
 from datasette.permissions import PermissionSQL
diff --git a/tests/test_table_html.py b/tests/test_table_html.py
index 81dbaa69..e3ddb4b0 100644
--- a/tests/test_table_html.py
+++ b/tests/test_table_html.py
@@ -8,7 +8,7 @@ from .fixtures import (  # noqa
 import pathlib
 import pytest
 import urllib.parse
-from .utils import assert_footer_links, inner_html
+from .utils import inner_html
 
 
 @pytest.mark.asyncio