tree a0d08ff0317b1b4c7521364e22c4a27260fa2e3d
parent ff413af605d7aab610272c5668bc870ebcbf56ef
author Skip Montanaro <skip@pobox.com> 1017348802 +0000
committer Skip Montanaro <skip@pobox.com> 1017348802 +0000
HG:extra convert_revision:svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/python/branches/legacy-trunk%4025990

add exception class hierarchy.  This should probably be done differently,
but at least the content is there.