Remove a bunch of unused imports (#3323)

stdlib/3/multiprocessing/__init__.pyi

@@ -1,9 +1,6 @@
 # Stubs for multiprocessing
 
-from typing import (
-    Any, Callable, ContextManager, Iterable, Mapping, Optional, Dict, List,
-    Union, Sequence, Tuple, Type, overload
-)
+from typing import Any, Callable, Iterable, Mapping, Optional, List, Union, Sequence, Tuple, Type, overload
 
 from ctypes import _CData
 from logging import Logger

stdlib/3/multiprocessing/context.pyi

@@ -5,10 +5,7 @@ import multiprocessing
 from multiprocessing import synchronize
 from multiprocessing import queues
 import sys
-from typing import (
-    Any, Callable, Iterable, Optional, List, Mapping, Sequence, Tuple, Type,
-    Union,
-)
+from typing import Any, Callable, Iterable, Optional, List, Mapping, Sequence, Type, Union
 
 _LockLike = Union[synchronize.Lock, synchronize.RLock]
 

stdlib/3/multiprocessing/dummy/__init__.pyi

@@ -1,13 +1,9 @@
-from typing import Any, Optional, List, Type
+from typing import Any, Optional, List
 
 import array
-import sys
 import threading
 import weakref
 
-from .connection import Pipe
-from threading import Lock, RLock, Semaphore, BoundedSemaphore
-from threading import Event, Condition, Barrier
 from queue import Queue
 
 JoinableQueue = Queue

stdlib/3/multiprocessing/dummy/connection.pyi

@@ -1,4 +1,4 @@
-from typing import Any, List, Optional, Tuple, Type, TypeVar
+from typing import Any, List, Optional, Tuple, TypeVar
 
 from queue import Queue
 

stdlib/3/multiprocessing/pool.pyi

@@ -1,8 +1,4 @@
-from typing import (
-    Any, Callable, ContextManager, Iterable, Mapping, Optional, List,
-    Type, TypeVar, Generic, Iterator
-)
-from types import TracebackType
+from typing import Any, Callable, ContextManager, Iterable, Mapping, Optional, List, TypeVar, Generic, Iterator
 
 _PT = TypeVar('_PT', bound=Pool)
 _S = TypeVar('_S')