diff --git a/Lib/asyncio/events.py b/Lib/asyncio/events.py
index 5362f05..57af68a 100644
--- a/Lib/asyncio/events.py
+++ b/Lib/asyncio/events.py
@@ -9,12 +9,9 @@
            ]
 
 import subprocess
-import sys
 import threading
 import socket
 
-from .log import logger
-
 
 class Handle:
     """Object returned by callback registration methods."""
diff --git a/Lib/asyncio/futures.py b/Lib/asyncio/futures.py
index b9cd45c..91ea170 100644
--- a/Lib/asyncio/futures.py
+++ b/Lib/asyncio/futures.py
@@ -11,7 +11,6 @@
 import traceback
 
 from . import events
-from .log import logger
 
 # States for Future.
 _PENDING = 'PENDING'
diff --git a/Lib/asyncio/tasks.py b/Lib/asyncio/tasks.py
index cf7b540..19fa654 100644
--- a/Lib/asyncio/tasks.py
+++ b/Lib/asyncio/tasks.py
@@ -7,7 +7,6 @@
            'gather', 'shield',
            ]
 
-import collections
 import concurrent.futures
 import functools
 import inspect
@@ -486,7 +485,6 @@
     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)
diff --git a/Lib/asyncio/test_utils.py b/Lib/asyncio/test_utils.py
index 2a8a241..dd87789 100644
--- a/Lib/asyncio/test_utils.py
+++ b/Lib/asyncio/test_utils.py
@@ -15,7 +15,7 @@
 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
diff --git a/Lib/asyncio/unix_events.py b/Lib/asyncio/unix_events.py
index ce45e5f..2125548 100644
--- a/Lib/asyncio/unix_events.py
+++ b/Lib/asyncio/unix_events.py
@@ -15,7 +15,6 @@
 from . import base_subprocess
 from . import constants
 from . import events
-from . import protocols
 from . import selector_events
 from . import tasks
 from . import transports
diff --git a/Lib/asyncio/windows_events.py b/Lib/asyncio/windows_events.py
index e6be9d1..60fb589 100644
--- a/Lib/asyncio/windows_events.py
+++ b/Lib/asyncio/windows_events.py
@@ -5,7 +5,6 @@
 import math
 import socket
 import struct
-import subprocess
 import weakref
 
 from . import events
diff --git a/Lib/selectors.py b/Lib/selectors.py
index a5465e2..9be9225 100644
--- a/Lib/selectors.py
+++ b/Lib/selectors.py
@@ -5,9 +5,8 @@
 """
 
 
-from abc import ABCMeta, abstractmethod, abstractproperty
+from abc import ABCMeta, abstractmethod
 from collections import namedtuple, Mapping
-import functools
 import math
 import select
 import sys