Restore compatibility with python 3.8

pyproject.toml

@@ -17,6 +17,7 @@ precision = 2
 exclude_also = ["raise NotImplementedError"]
 
 [tool.mypy]
+python_version = "3.8"
 files = "skillbridge"
 pretty = true
 show_error_context = true

skillbridge/client/hints.py

@@ -1,9 +1,9 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING, Any, NamedTuple, NewType, TypeAlias
+from typing import TYPE_CHECKING, Any, Dict, List, NamedTuple, NewType, Tuple, Union
 
 if TYPE_CHECKING:  # pragma: no cover
-    from typing_extensions import Protocol
+    from typing_extensions import Protocol, TypeAlias
 else:
 
     class Protocol:
@@ -17,15 +17,14 @@ class Protocol:
     'SkillComponent',
     'SkillCode',
     'Skill',
-    'Definition',
     'Function',
     'SkillTuple',
     'SkillList',
     'SupportsReprSkill',
 ]
 
-Number = int | float
-SkillComponent = int | str
+Number = Union[int, float]
+SkillComponent = Union[int, str]
 SkillCode = NewType('SkillCode', str)
 
 
@@ -35,9 +34,6 @@ class Function(NamedTuple):
     aliases: set[str]
 
 
-Definition = list[Function]
-
-
 class SupportsReprSkill(Protocol):
     def __repr_skill__(self) -> SkillCode:  # pragma: no cover
         ...
@@ -46,31 +42,31 @@ def __repr_skill__(self) -> SkillCode:  # pragma: no cover
 if TYPE_CHECKING:  # pragma: no cover
     from .var import Var
 
-    Skill: TypeAlias = (
-        Var
-        | SupportsReprSkill
-        | Number
-        | str
-        | bool
-        | None
-        | 'SkillList'
-        | 'SkillDict'
-        | 'SkillTuple'
-    )
+    Skill: TypeAlias = Union[
+        Var,
+        SupportsReprSkill,
+        Number,
+        str,
+        bool,
+        None,
+        'SkillList',
+        'SkillDict',
+        'SkillTuple',
+    ]
 
 else:
-    Skill: TypeAlias = Any
+    Skill = Any
 
 
-class SkillList(list[Skill]):
+class SkillList(List[Skill]):
     pass
 
 
-class SkillTuple(tuple[Skill, ...]):
+class SkillTuple(Tuple[Skill, ...]):
     __slots__ = ()
 
 
-class SkillDict(dict[str, Skill]):
+class SkillDict(Dict[str, Skill]):
     pass
 
 

skillbridge/client/translator.py

@@ -18,7 +18,10 @@ def _raise_error(message: str) -> NoReturn:
 
 def _show_warning(message: str, result: Any) -> Any:
     for i, line in enumerate(message.splitlines(keepends=False)):
-        warn_explicit(line.removeprefix("*WARNING*"), UserWarning, "Skill response", i)
+        message = line
+        if line.startswith("*WARNING*"):
+            message = message[9:]
+        warn_explicit(message, UserWarning, "Skill response", i)
 
     return result
 

skillbridge/client/workspace.py

@@ -6,7 +6,7 @@
 from inspect import signature
 from logging import getLogger
 from textwrap import dedent
-from typing import Any, Callable, Iterable, NoReturn, cast
+from typing import Any, Callable, Iterable, NoReturn, Union, cast
 
 from .channel import Channel, DirectChannel, create_channel_class
 from .functions import FunctionCollection, LiteralRemoteFunction
@@ -17,7 +17,7 @@
 
 __all__ = ['Workspace', 'current_workspace']
 
-WorkspaceId = str | int | None
+WorkspaceId = Union[str, int, None]
 _open_workspaces: dict[WorkspaceId, Workspace] = {}