bpo-33505: Optimize asyncio.ensure_future by reordering if conditions (GH-6836)

1 files changed, 5 insertions, 5 deletions

diff --git a/Lib/asyncio/tasks.py b/Lib/asyncio/tasks.py
index 5df1af6642..4a9db2a3a0 100644
--- a/Lib/asyncio/tasks.py
+++ b/Lib/asyncio/tasks.py
@@ -542,17 +542,17 @@ def ensure_future(coro_or_future, *, loop=None):
 
     If the argument is a Future, it is returned directly.
     """
-    if futures.isfuture(coro_or_future):
-        if loop is not None and loop is not futures._get_loop(coro_or_future):
-            raise ValueError('loop argument must agree with Future')
-        return coro_or_future
-    elif coroutines.iscoroutine(coro_or_future):
+    if coroutines.iscoroutine(coro_or_future):
         if loop is None:
             loop = events.get_event_loop()
         task = loop.create_task(coro_or_future)
         if task._source_traceback:
             del task._source_traceback[-1]
         return task
+    elif futures.isfuture(coro_or_future):
+        if loop is not None and loop is not futures._get_loop(coro_or_future):
+            raise ValueError('loop argument must agree with Future')
+        return coro_or_future
     elif inspect.isawaitable(coro_or_future):
         return ensure_future(_wrap_awaitable(coro_or_future), loop=loop)
     else: