coros: pep8

gevent/coros.py

@@ -172,7 +172,7 @@ class BoundedSemaphore(Semaphore):
 
     def release(self):
         if self.counter >= self._initial_value:
-            raise ValueError, "Semaphore released too many times"
+            raise ValueError("Semaphore released too many times")
         return Semaphore.release(self)