Fix imports of typing stuff for python3.10, 3.9, etc

Change-Id: I453fc4c08294f103840d8c0a557c71fbfd340bb1

Author: zzzeek

awaitlet/base.py

@@ -7,11 +7,12 @@
 from typing import Callable
 from typing import Coroutine
 from typing import TYPE_CHECKING
-from typing import TypeGuard
 from typing import TypeVar
 
 from greenlet import greenlet
 
+from .util.typing import TypeGuard
+
 _T = TypeVar("_T")
 
 

awaitlet/util/testing.py

@@ -6,11 +6,11 @@
 from typing import Any
 from typing import Coroutine
 from typing import Literal
-from typing import Self
 from typing import TypeVar
 from typing import Union
 
 from .langhelpers import _pytest_fn_decorator
+from .typing import Self
 
 _T = TypeVar("_T", bound=Any)
 

awaitlet/util/typing.py

@@ -0,0 +1,8 @@
+from __future__ import annotations
+
+if True:  # zimports removes the tailing comments
+    from typing_extensions import (
+        Literal as Literal,
+    )  # 3.8 but has bugs before 3.10
+    from typing_extensions import Self as Self  # 3.11
+    from typing_extensions import TypeGuard as TypeGuard  # 3.10

pyproject.toml

@@ -21,7 +21,8 @@ classifiers = [
 ]
 
 dependencies = [
-    "greenlet"
+    "greenlet",
+    "typing-extensions >= 4.6.0",
 ]
 
 [tool.setuptools.packages]

setup.cfg

@@ -4,6 +4,7 @@ enable-extensions = G
 # E203 is due to https://github.com/PyCQA/pycodestyle/issues/373
 per-file-ignores =
     **/__init__.py:F401
+    awaitlet/util/typing.py:F401
 ignore =
     A003,A005
     D,