Another asyncio sync.

Lib/asyncio/base_events.py

@@ -13,7 +13,6 @@
 to modify the meaning of the API call itself.
 """
 
-
 import collections
 import concurrent.futures
 import heapq
@@ -1128,7 +1127,7 @@ def subprocess_shell(self, protocol_factory, cmd, *, stdin=subprocess.PIPE,
         transport = yield from self._make_subprocess_transport(
             protocol, cmd, True, stdin, stdout, stderr, bufsize, **kwargs)
         if self._debug:
-            logger.info('%s: %r' % (debug_log, transport))
+            logger.info('%s: %r', debug_log, transport)
         return transport, protocol
 
     @coroutine
@@ -1158,7 +1157,7 @@ def subprocess_exec(self, protocol_factory, program, *args,
             protocol, popen_args, False, stdin, stdout, stderr,
             bufsize, **kwargs)
         if self._debug:
-            logger.info('%s: %r' % (debug_log, transport))
+            logger.info('%s: %r', debug_log, transport)
         return transport, protocol
 
     def get_exception_handler(self):
@@ -1238,7 +1237,9 @@ def call_exception_handler(self, context):
         - 'handle' (optional): Handle instance;
         - 'protocol' (optional): Protocol instance;
         - 'transport' (optional): Transport instance;
-        - 'socket' (optional): Socket instance.
+        - 'socket' (optional): Socket instance;
+        - 'asyncgen' (optional): Asynchronous generator that caused
+                                 the exception.
 
         New keys maybe introduced in the future.
 

Lib/asyncio/tasks.py

@@ -519,7 +519,7 @@ def sleep(delay, result=None, *, loop=None):
         h.cancel()
 
 
-def async(coro_or_future, *, loop=None):
+def async_(coro_or_future, *, loop=None):
     """Wrap a coroutine in a future.
 
     If the argument is a Future, it is returned directly.
@@ -532,6 +532,11 @@ def async(coro_or_future, *, loop=None):
 
     return ensure_future(coro_or_future, loop=loop)
 
+# Silence DeprecationWarning:
+globals()['async'] = async_
+async_.__name__ = 'async'
+del async_
+
 
 def ensure_future(coro_or_future, *, loop=None):
     """Wrap a coroutine or an awaitable in a future.