"""
Returns the final number used in a list of objects with names of
the form WhateverFileName_###
"""
# Copyright © 2004 Saugus.net, Inc.
# All Rights Reserved.

# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.

from string import rfind

finalNum=0
for objectID in context.objectIds():
  finalUnderscore=rfind(objectID,'_')
  if finalUnderscore!=-1:
    try:
      theNum=int(objectID[finalUnderscore+1:])
      if theNum>finalNum:
        finalNum=theNum
    except (ValueError,TypeError):
      pass
return finalNum