Improve performance of asyncio.iscoroutine

Author: 1st1

asyncio/coroutines.py

@@ -38,8 +38,11 @@
 
 try:
     _inspect_iscoroutinefunction = inspect.iscoroutinefunction
+    _inspect_iscoroutine = inspect.iscoroutine
 except AttributeError:
+    # Python 3.4
     _inspect_iscoroutinefunction = lambda func: False
+    _inspect_iscoroutine = lambda obj: False
 
 try:
     from collections.abc import Coroutine as _CoroutineABC, \
@@ -259,7 +262,7 @@ def iscoroutinefunction(func):
 
 def iscoroutine(obj):
     """Return True if obj is a coroutine object."""
-    return isinstance(obj, _COROUTINE_TYPES)
+    return _inspect_iscoroutine(obj) or isinstance(obj, _COROUTINE_TYPES)
 
 
 def _format_coroutine(coro):