asyncio: remove unused imports and unused variables noticed by pyflakes

Lib/asyncio/events.py

@@ -9,12 +9,9 @@ __all__ = ['AbstractEventLoopPolicy',
            ]
 
 import subprocess
-import sys
 import threading
 import socket
 
-from .log import logger
-
 
 class Handle:
     """Object returned by callback registration methods."""

Lib/asyncio/futures.py

@@ -11,7 +11,6 @@ import sys
 import traceback
 
 from . import events
-from .log import logger
 
 # States for Future.
 _PENDING = 'PENDING'

Lib/asyncio/tasks.py

@@ -7,7 +7,6 @@ __all__ = ['coroutine', 'Task',
            'gather', 'shield',
            ]
 
-import collections
 import concurrent.futures
 import functools
 import inspect
@@ -486,7 +485,6 @@ def as_completed(fs, *, loop=None, timeout=None):
     if isinstance(fs, futures.Future) or iscoroutine(fs):
         raise TypeError("expect a list of futures, not %s" % type(fs).__name__)
     loop = loop if loop is not None else events.get_event_loop()
-    deadline = None if timeout is None else loop.time() + timeout
     todo = {async(f, loop=loop) for f in set(fs)}
     from .queues import Queue  # Import here to avoid circular import problem.
     done = Queue(loop=loop)

Lib/asyncio/test_utils.py

@@ -15,7 +15,7 @@ import unittest
 import unittest.mock
 
 from http.server import HTTPServer
-from wsgiref.simple_server import make_server, WSGIRequestHandler, WSGIServer
+from wsgiref.simple_server import WSGIRequestHandler, WSGIServer
 
 try:
     import ssl

Lib/asyncio/unix_events.py

@@ -15,7 +15,6 @@ from . import base_events
 from . import base_subprocess
 from . import constants
 from . import events
-from . import protocols
 from . import selector_events
 from . import tasks
 from . import transports

Lib/asyncio/windows_events.py

@@ -5,7 +5,6 @@ import errno
 import math
 import socket
 import struct
-import subprocess
 import weakref
 
 from . import events

Lib/selectors.py

@@ -5,9 +5,8 @@ This module allows high-level and efficient I/O multiplexing, built upon the
 """
 
 
-from abc import ABCMeta, abstractmethod, abstractproperty
+from abc import ABCMeta, abstractmethod
 from collections import namedtuple, Mapping
-import functools
 import math
 import select
 import sys