asyncio: sync with github

* Fix ResourceWarning warnings in test_streams
* Return True from StreamReader.eof_received() to fix
  http://bugs.python.org/issue24539 (but still needs a unittest).
  Add StreamReader.__repr__() for easy debugging.
* remove unused imports
* Issue #234: Drop JoinableQueue on Python 3.5+

Lib/asyncio/locks.py

@@ -3,7 +3,6 @@
 __all__ = ['Lock', 'Event', 'Condition', 'Semaphore', 'BoundedSemaphore']
 
 import collections
-import sys
 
 from . import compat
 from . import events

Lib/asyncio/queues.py

@@ -1,11 +1,11 @@
 """Queues"""
 
-__all__ = ['Queue', 'PriorityQueue', 'LifoQueue', 'QueueFull', 'QueueEmpty',
-           'JoinableQueue']
+__all__ = ['Queue', 'PriorityQueue', 'LifoQueue', 'QueueFull', 'QueueEmpty']
 
 import collections
 import heapq
 
+from . import compat
 from . import events
 from . import futures
 from . import locks
@@ -289,5 +289,7 @@ class LifoQueue(Queue):
         return self._queue.pop()
 
 
-JoinableQueue = Queue
-"""Deprecated alias for Queue."""
+if not compat.PY35:
+    JoinableQueue = Queue
+    """Deprecated alias for Queue."""
+    __all__.append('JoinableQueue')

Lib/asyncio/streams.py

@@ -6,7 +6,6 @@ __all__ = ['StreamReader', 'StreamWriter', 'StreamReaderProtocol',
            ]
 
 import socket
-import sys
 
 if hasattr(socket, 'AF_UNIX'):
     __all__.extend(['open_unix_connection', 'start_unix_server'])
@@ -240,6 +239,7 @@ class StreamReaderProtocol(FlowControlMixin, protocols.Protocol):
 
     def eof_received(self):
         self._stream_reader.feed_eof()
+        return True
 
 
 class StreamWriter:
@@ -321,6 +321,24 @@ class StreamReader:
         self._transport = None
         self._paused = False
 
+    def __repr__(self):
+        info = ['StreamReader']
+        if self._buffer:
+            info.append('%d bytes' % len(info))
+        if self._eof:
+            info.append('eof')
+        if self._limit != _DEFAULT_LIMIT:
+            info.append('l=%d' % self._limit)
+        if self._waiter:
+            info.append('w=%r' % self._waiter)
+        if self._exception:
+            info.append('e=%r' % self._exception)
+        if self._transport:
+            info.append('t=%r' % self._transport)
+        if self._paused:
+            info.append('paused')
+        return '<%s>' % ' '.join(info)
+
     def exception(self):
         return self._exception
 

Lib/asyncio/subprocess.py

@@ -1,10 +1,8 @@
 __all__ = ['create_subprocess_exec', 'create_subprocess_shell']
 
-import collections
 import subprocess
 
 from . import events
-from . import futures
 from . import protocols
 from . import streams
 from . import tasks

Lib/asyncio/tasks.py

@@ -10,8 +10,6 @@ import concurrent.futures
 import functools
 import inspect
 import linecache
-import sys
-import types
 import traceback
 import warnings
 import weakref

Lib/asyncio/transports.py

@@ -1,7 +1,5 @@
 """Abstract Transport class."""
 
-import sys
-
 from asyncio import compat
 
 __all__ = ['BaseTransport', 'ReadTransport', 'WriteTransport',