Raise statement normalization in Lib/.
diff --git a/Lib/asynchat.py b/Lib/asynchat.py
index 9157f33..9443656 100644
--- a/Lib/asynchat.py
+++ b/Lib/asynchat.py
@@ -66,10 +66,10 @@
         asyncore.dispatcher.__init__ (self, conn)
 
     def collect_incoming_data(self, data):
-        raise NotImplementedError, "must be implemented in subclass"
+        raise NotImplementedError("must be implemented in subclass")
 
     def found_terminator(self):
-        raise NotImplementedError, "must be implemented in subclass"
+        raise NotImplementedError("must be implemented in subclass")
 
     def set_terminator (self, term):
         "Set the input delimiter.  Can be a fixed string of any length, an integer, or None"