final round of __all__ lists (I hope) - skipped urllib2 because Moshe may be

giving it a slight facelift

Lib/warnings.py

@@ -2,6 +2,9 @@
 
 import sys, re, types
 
+__all__ = ["warn", "showwarning", "formatwarning", "filterwarnings",
+           "resetwarnings"]
+
 defaultaction = "default"
 filters = []
 onceregistry = {}