tornado: add some types, set version (#5742)

stubs/tornado/@python2/tornado/locks.pyi

@@ -1,45 +1,50 @@
-from typing import Any, Optional
+from types import TracebackType
+from typing import Any, Optional, Type
+
+from .concurrent import Future
 
 class _TimeoutGarbageCollector:
-    def __init__(self): ...
+    def __init__(self) -> None: ...
 
 class Condition(_TimeoutGarbageCollector):
     io_loop: Any
-    def __init__(self): ...
-    def wait(self, timeout: Optional[Any] = ...): ...
-    def notify(self, n: int = ...): ...
-    def notify_all(self): ...
+    def __init__(self) -> None: ...
+    def wait(self, timeout: Optional[float] = ...) -> Future: ...
+    def notify(self, n: int = ...) -> None: ...
+    def notify_all(self) -> None: ...
 
 class Event:
-    def __init__(self): ...
-    def is_set(self): ...
-    def set(self): ...
-    def clear(self): ...
+    def __init__(self) -> None: ...
+    def is_set(self) -> bool: ...
+    def set(self) -> None: ...
+    def clear(self) -> None: ...
     def wait(self, timeout: Optional[Any] = ...): ...
 
 class _ReleasingContextManager:
-    def __init__(self, obj): ...
-    def __enter__(self): ...
+    def __init__(self, obj) -> None: ...
+    def __enter__(self) -> None: ...
     def __exit__(self, exc_type, exc_val, exc_tb): ...
 
 class Semaphore(_TimeoutGarbageCollector):
-    def __init__(self, value: int = ...): ...
-    def release(self): ...
-    def acquire(self, timeout: Optional[Any] = ...): ...
-    def __enter__(self): ...
-    __exit__: Any
-    def __aenter__(self): ...
-    def __aexit__(self, typ, value, tb): ...
+    def __init__(self, value: int = ...) -> None: ...
+    def release(self) -> None: ...
+    def acquire(self, timeout: Optional[float] = ...) -> Future: ...
+    # __enter__ and __exit__ exist but always throw an error, so we
+    # omit them to give better error message while type checking.
+    def __aenter__(self) -> Future: ...
+    def __aexit__(
+        self, typ: Optional[Type[BaseException]], value: Optional[BaseException], tb: Optional[TracebackType]
+    ) -> Future: ...
 
-class BoundedSemaphore(Semaphore):
-    def __init__(self, value: int = ...): ...
-    def release(self): ...
+class BoundedSemaphore(Semaphore): ...
 
 class Lock:
-    def __init__(self): ...
-    def acquire(self, timeout: Optional[Any] = ...): ...
-    def release(self): ...
-    def __enter__(self): ...
-    __exit__: Any
-    def __aenter__(self): ...
-    def __aexit__(self, typ, value, tb): ...
+    def __init__(self) -> None: ...
+    def acquire(self, timeout: Optional[float] = ...) -> Future: ...
+    def release(self) -> None: ...
+    # __enter__ and __exit__ exist but always throw an error, so we
+    # omit them to give better error message while type checking.
+    def __aenter__(self) -> Future: ...
+    def __aexit__(
+        self, typ: Optional[Type[BaseException]], value: Optional[BaseException], tb: Optional[TracebackType]
+    ) -> Future: ...

stubs/tornado/METADATA.toml

@@ -1,2 +1,7 @@
-version = "0.1"
+# tornado ships with types as of version 6, but
+# we keep these stubs around for the benefit of
+# Python 2 users (see #4412). Therefore, these
+# stubs target version 5.1, the last to support
+# Python 2.
+version = "5.1"
 python2 = true