asyncio: sync with Tulip

* PipeHandle now uses None instead of -1 for a closed handle
* Sort imports in windows_utils.
* Fix test_events on Python older than 3.5. Skip SSL tests on the
  ProactorEventLoop if ssl.MemoryIO is missing
* Fix BaseEventLoop._create_connection_transport(). Close the transport if the
  creation of the transport (if the waiter) gets an exception.
* _ProactorBasePipeTransport now sets _sock to None when the transport is
  closed.
* Fix BaseSubprocessTransport.close(). Ignore pipes for which the protocol is
  not set yet (still equal to None).
* TestLoop.close() now calls the close() method of the parent class
  (BaseEventLoop).
* Cleanup BaseSelectorEventLoop: create the protocol on a separated line for
  readability and ease debugging.
* Fix BaseSubprocessTransport._kill_wait(). Set the _returncode attribute, so
  close() doesn't try to terminate the process.
* Tests: explicitly close event loops and transports
* UNIX pipe transports: add closed/closing in repr(). Add "closed" or "closing"
  state in the __repr__() method of _UnixReadPipeTransport and
  _UnixWritePipeTransport classes.

1 files changed, 5 insertions, 5 deletions

diff --git a/Lib/asyncio/windows_utils.py b/Lib/asyncio/windows_utils.py
index b47581235c..e6642960db 100644
--- a/Lib/asyncio/windows_utils.py
+++ b/Lib/asyncio/windows_utils.py
@@ -7,13 +7,13 @@ import sys
 if sys.platform != 'win32':  # pragma: no cover
     raise ImportError('win32 only')
 
-import socket
+import _winapi
 import itertools
 import msvcrt
 import os
+import socket
 import subprocess
 import tempfile
-import _winapi
 
 
 __all__ = ['socketpair', 'pipe', 'Popen', 'PIPE', 'PipeHandle']
@@ -136,7 +136,7 @@ class PipeHandle:
         self._handle = handle
 
     def __repr__(self):
-        if self._handle != -1:
+        if self._handle is not None:
             handle = 'handle=%r' % self._handle
         else:
             handle = 'closed'
@@ -150,9 +150,9 @@ class PipeHandle:
         return self._handle
 
     def close(self, *, CloseHandle=_winapi.CloseHandle):
-        if self._handle != -1:
+        if self._handle is not None:
             CloseHandle(self._handle)
-            self._handle = -1
+            self._handle = None
 
     __del__ = close