From f2d96e6e62afc2f12fb2d0abcba659f366bde92f Mon Sep 17 00:00:00 2001
From: Will McGugan <willmcgugan@gmail.com>
Date: Tue, 7 Feb 2023 12:01:18 +0000
Subject: [PATCH] or None

---
 src/textual/_types.py         | 3 +--
 src/textual/css/_help_text.py | 7 +++++--
 src/textual/css/constants.py  | 1 -
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/textual/_types.py b/src/textual/_types.py
index 4881cbab8..5db2e27f3 100644
--- a/src/textual/_types.py
+++ b/src/textual/_types.py
@@ -1,8 +1,7 @@
 from typing import TYPE_CHECKING, Awaitable, Callable, List, Union
 
-from typing_extensions import Protocol
-
 from rich.segment import Segment
+from typing_extensions import Protocol
 
 if TYPE_CHECKING:
     from .message import Message
diff --git a/src/textual/css/_help_text.py b/src/textual/css/_help_text.py
index 0e57fdccf..e0f3b60ed 100644
--- a/src/textual/css/_help_text.py
+++ b/src/textual/css/_help_text.py
@@ -126,7 +126,10 @@ def _spacing_examples(property_name: str) -> ContextSpecificBullets:
 
 
 def property_invalid_value_help_text(
-    property_name: str, context: StylingContext, *, suggested_property_name: str = None
+    property_name: str,
+    context: StylingContext,
+    *,
+    suggested_property_name: str | None = None,
 ) -> HelpText:
     """Help text to show when the user supplies an invalid value for CSS property
     property.
@@ -301,7 +304,7 @@ def color_property_help_text(
     property_name: str,
     context: StylingContext,
     *,
-    error: Exception = None,
+    error: Exception | None = None,
 ) -> HelpText:
     """Help text to show when the user supplies an invalid value for a color
     property. For example, an unparseable color string.
diff --git a/src/textual/css/constants.py b/src/textual/css/constants.py
index c9598ff32..c3c073940 100644
--- a/src/textual/css/constants.py
+++ b/src/textual/css/constants.py
@@ -5,7 +5,6 @@ from ..geometry import Spacing
 
 if typing.TYPE_CHECKING:
     from typing_extensions import Final
-    from .types import EdgeType
 
 VALID_VISIBILITY: Final = {"visible", "hidden"}
 VALID_DISPLAY: Final = {"block", "none"}