Remove Python 3.8 workarounds.

core/src/toga/command.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
-from collections.abc import Iterator
-from typing import TYPE_CHECKING, MutableMapping, MutableSet, Protocol
+from collections.abc import Iterator, MutableMapping, MutableSet
+from typing import TYPE_CHECKING, Protocol
 
 from toga.handlers import simple_handler, wrapped_handler
 from toga.icons import Icon

core/src/toga/documents.py

@@ -1,11 +1,10 @@
 from __future__ import annotations
 
 import itertools
-import sys
 from abc import ABC, abstractmethod
-from collections.abc import Iterator
+from collections.abc import Iterator, Mapping, Sequence
 from pathlib import Path
-from typing import TYPE_CHECKING, Mapping, Sequence
+from typing import TYPE_CHECKING
 
 import toga
 from toga import dialogs
@@ -225,12 +224,7 @@ def __getitem__(self, path_or_index):
             return self.elements[path_or_index]
 
         # Look up by path
-        if sys.version_info < (3, 9):  # pragma: no-cover-if-gte-py39
-            # resolve() *should* turn the path into an absolute path;
-            # but on Windows, with Python 3.8, it doesn't.
-            path = Path(path_or_index).absolute().resolve()
-        else:  # pragma: no-cover-if-lt-py39
-            path = Path(path_or_index).resolve()
+        path = Path(path_or_index).resolve()
         for item in self.elements:
             if item.path == path:
                 return item
@@ -320,12 +314,7 @@ def open(self, path: Path | str) -> Document:
             match a registered document type.
         """
         try:
-            if sys.version_info < (3, 9):  # pragma: no-cover-if-gte-py39
-                # resolve() *should* turn the path into an absolute path;
-                # but on Windows, with Python 3.8, it doesn't.
-                path = Path(path).absolute().resolve()
-            else:  # pragma: no-cover-if-lt-py39
-                path = Path(path).resolve()
+            path = Path(path).resolve()
             document = self.app.documents[path]
             document.focus()
             return document

core/src/toga/handlers.py

@@ -6,12 +6,11 @@
 import traceback
 import warnings
 from abc import ABC
+from collections.abc import Awaitable, Generator
 from typing import (
     TYPE_CHECKING,
     Any,
-    Awaitable,
     Callable,
-    Generator,
     NoReturn,
     Protocol,
     TypeVar,

core/src/toga/sources/tree_source.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
-from collections.abc import Iterator
-from typing import Iterable, Mapping, TypeVar
+from collections.abc import Iterable, Iterator, Mapping
+from typing import TypeVar
 
 from .base import Source
 from .list_source import Row, _find_item

core/src/toga/statusicons.py

@@ -2,8 +2,8 @@
 
 import sys
 from abc import abstractmethod
-from collections.abc import Iterator
-from typing import TYPE_CHECKING, Mapping, Sequence
+from collections.abc import Iterator, Mapping, Sequence
+from typing import TYPE_CHECKING
 
 import toga
 from toga.command import Command, CommandSet, Group

core/src/toga/window.py

@@ -2,9 +2,9 @@
 
 import warnings
 from builtins import id as identifier
-from collections.abc import Coroutine, Iterator
+from collections.abc import Coroutine, Iterator, MutableSet
 from pathlib import Path
-from typing import TYPE_CHECKING, Any, MutableSet, Protocol, TypeVar
+from typing import TYPE_CHECKING, Any, Protocol, TypeVar
 
 import toga
 from toga import dialogs

pyproject.toml

@@ -42,9 +42,6 @@ no-cover-if-lt-py311 = "sys_version_info < (3, 11) and os_environ.get('COVERAGE_
 no-cover-if-gte-py311 = "sys_version_info > (3, 11) and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
 no-cover-if-lt-py310 = "sys_version_info < (3, 10) and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
 no-cover-if-gte-py310 = "sys_version_info > (3, 10) and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
-no-cover-if-lt-py39 = "sys_version_info < (3, 9) and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
-no-cover-if-gte-py39 = "sys_version_info > (3, 9) and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
-
 
 [tool.isort]
 profile = "black"