Fix type annotations

src/debugpy/server/__init__.py

@@ -3,6 +3,10 @@
 # for license information.
 
 import itertools
+from typing import TYPE_CHECKING, Optional
+
+if TYPE_CHECKING:
+    import debugpy.server.adapters as adapters
 
 # Unique IDs for DAP objects such as threads, variables, breakpoints etc. These are
 # negative to allow for pre-existing OS-assigned IDs (which are positive) to be used
@@ -10,12 +14,12 @@ import itertools
 _dap_ids = itertools.count(-1, -1)
 
 
-def new_dap_id():
+def new_dap_id() -> int:
     """Returns the next unique ID."""
     return next(_dap_ids)
 
 
-def adapter():
+def adapter() -> Optional["adapters.Adapter"]:
     """
     Returns the instance of Adapter corresponding to the debug adapter that is currently
     connected to this process, or None if there is no adapter connected. Use in lieu of

src/debugpy/server/inspect/__init__.py

@@ -6,7 +6,7 @@
 Object inspection: rendering values, enumerating children etc.
 """
 
-from typing import Iterable
+from collections.abc import Iterable
 
 
 class ChildObject:

src/debugpy/server/inspect/stdlib.py

@@ -4,8 +4,8 @@
 
 """Object inspection for builtin Python types."""
 
+from collections.abc import Iterable
 from itertools import count
-from typing import Iterable
 
 from debugpy.common import log
 from debugpy.server.inspect import ChildObject, ObjectInspector, inspect

src/debugpy/server/tracing/__init__.py

@@ -6,6 +6,7 @@ import re
 import threading
 import traceback
 from collections import defaultdict
+from collections.abc import Callable, Iterable
 from dataclasses import dataclass
 from debugpy import server
 from debugpy.common import log
@@ -15,7 +16,7 @@ from enum import Enum
 from pathlib import Path
 from sys import monitoring
 from types import CodeType, FrameType
-from typing import Callable, ClassVar, Dict, Iterable, List, Literal, Union
+from typing import ClassVar, Literal, Union
 
 # Shared for all global state pertaining to breakpoints and stepping.
 _cvar = threading.Condition()
@@ -145,7 +146,7 @@ class Thread:
     can exclude a specific thread from tracing.
     """
 
-    _all: ClassVar[Dict[int, "Thread"]] = {}
+    _all: ClassVar[dict[int, "Thread"]] = {}
 
     def __init__(self, python_thread: threading.Thread):
         """
@@ -294,9 +295,9 @@ class StackFrame:
     python_frame: FrameType
 
     _source: Source | None
-    _scopes: List[Scope]
+    _scopes: list[Scope]
 
-    _all: ClassVar[Dict[int, "StackFrame"]] = {}
+    _all: ClassVar[dict[int, "StackFrame"]] = {}
 
     def __init__(self, thread: Thread, python_frame: FrameType):
         """
@@ -351,7 +352,7 @@ class StackFrame:
     def get(self, id: int) -> "StackFrame":
         return self._all.get(id, None)
 
-    def scopes(self) -> List[Scope]:
+    def scopes(self) -> list[Scope]:
         if self._scopes is None:
             self._scopes = [
                 Scope(self, "local", self.python_frame.f_locals),
@@ -554,9 +555,9 @@ class Breakpoint:
     hit_count: int
     """Number of times this breakpoint has been hit."""
 
-    _all: ClassVar[Dict[int, "Breakpoint"]] = {}
+    _all: ClassVar[dict[int, "Breakpoint"]] = {}
 
-    _at: ClassVar[Dict[Source, Dict[int, List["Breakpoint"]]]] = defaultdict(
+    _at: ClassVar[dict[Source, dict[int, list["Breakpoint"]]]] = defaultdict(
         lambda: defaultdict(lambda: [])
     )
 
@@ -594,7 +595,7 @@ class Breakpoint:
         }
 
     @classmethod
-    def at(self, source: Source, line: int) -> List["Breakpoint"]:
+    def at(self, source: Source, line: int) -> list["Breakpoint"]:
         """
         Returns a list of all breakpoints at the specified location.
         """

src/debugpy/server/tracing/tracer.py

@@ -7,6 +7,7 @@ import inspect
 import sys
 import threading
 import traceback
+from collections.abc import Iterable
 from debugpy import server
 from debugpy.server.tracing import (
     Breakpoint,
@@ -21,7 +22,7 @@ from debugpy.server.tracing import (
 )
 from sys import monitoring
 from types import CodeType, FrameType, TracebackType
-from typing import Iterable, Literal, Type
+from typing import Literal
 
 
 class Log:
@@ -442,7 +443,7 @@ class Tracer:
         self._process_exception(exc, thread, "reraise")
 
     def _sys_excepthook(
-        self, exc_type: Type, exc: BaseException, tb: TracebackType
+        self, exc_type: type, exc: BaseException, tb: TracebackType
     ):
         thread = self._this_thread()
         if thread is None or not thread.is_traced: