add (overwrite with) mypy stubs, if available

stdlib/3/threading.pyi

@@ -0,0 +1,56 @@
+# Stubs for threading
+
+# NOTE: These are incomplete!
+
+from typing import Any, Dict, Optional, Callable, TypeVar, Union
+
+class Thread:
+    name = ''
+    ident = 0
+    daemon = False
+
+    def __init__(self, group: Any = None, target: Any = None, args: Any = (),
+                 kwargs: Dict[Any, Any] = None,
+                 verbose: Any = None) -> None: ...
+    def start(self) -> None: ...
+    def run(self) -> None: ...
+    def join(self, timeout: float = 0.0) -> None: ...
+    def is_alive(self) -> bool: ...
+
+    # Legacy methods
+    def getName(self) -> str: ...
+    def setName(self, name: str) -> None: ...
+    def isDaemon(self) -> bool: ...
+    def setDaemon(self, daemon: bool) -> None: ...
+
+class Event:
+    def is_set(self) -> bool: ...
+    def set(self) -> None: ...
+    def clear(self) -> None: ...
+    # TODO can it return None?
+    def wait(self, timeout: float = 0.0) -> bool: ...
+
+class Lock:
+    def acquire(self, blocking: bool = True, timeout: float = -1.0) -> bool: ...
+    def release(self) -> None: ...
+    def __enter__(self) -> bool: ...
+    def __exit__(self, *args): ...
+
+class RLock:
+    def acquire(self, blocking: bool = True,
+                timeout: float = -1.0) -> Optional[bool]: ...
+    def release(self) -> None: ...
+    def __enter__(self) -> bool: ...
+    def __exit__(self, *args): ...
+
+_T = TypeVar('_T')
+
+class Condition:
+    def acquire(self, blocking: bool = True, timeout: float = -1.0) -> bool: ...
+    def release(self) -> None: ...
+    def notify(self, n: int = 1) -> None: ...
+    def notify_all(self) -> None: ...
+    def wait(self, timeout: float = None) -> bool: ...
+    def wait_for(self, predicate: Callable[[], _T], timeout: float = None) -> Union[_T, bool]: ...
+    def __enter__(self) -> bool: ...
+    def __exit__(self, *args): ...