#6112: list.remove raises ValueError, not RuntimeError.

Doc/library/sched.rst

@@ -100,7 +100,7 @@ Scheduler Objects
 .. method:: scheduler.cancel(event)
 
    Remove the event from the queue. If *event* is not an event currently in the
-   queue, this method will raise a :exc:`RuntimeError`.
+   queue, this method will raise a :exc:`ValueError`.
 
 
 .. method:: scheduler.empty()

Lib/sched.py

@@ -67,7 +67,7 @@ class scheduler:
         """Remove an event from the queue.
 
         This must be presented the ID as returned by enter().
-        If the event is not in the queue, this raises RuntimeError.
+        If the event is not in the queue, this raises ValueError.
 
         """
         self._queue.remove(event)