Update tornado/ioloop.py

diff --git a/tornado/ioloop.py b/tornado/ioloop.py
index 3b95d08e61170fdc4685766ac33199eb2ecbff49..82b38b216007817963604c28065cb479eccd34c2 100644 (file)
--- a/tornado/ioloop.py
+++ b/tornado/ioloop.py
@@ -178,9 +178,7 @@ class IOLoop(Configurable):
         if isinstance(impl, str):
             impl = import_object(impl)
         if isinstance(impl, type) and not issubclass(impl, BaseAsyncIOLoop):
-            raise RuntimeError(
-                "only AsyncIOLoop is allowed when asyncio is available"
-            )
+            raise RuntimeError("only AsyncIOLoop is allowed when asyncio is available")
         super(IOLoop, cls).configure(impl, **kwargs)
 
     @staticmethod