text: #!/usr/local/bin/python
  # -*- coding: iso-8859-1 -*-
  
  # $Id: util.py,v 1.1.1.1 2011/06/10 09:34:43 andrew Exp $
  
  # Copyright (c) 2004 Kungliga Tekniska Högskolan
  # (Royal Institute of Technology, Stockholm, Sweden). 
  # All rights reserved. 
  # 
  # Redistribution and use in source and binary forms, with or without 
  # modification, are permitted provided that the following conditions 
  # are met: 
  # 
  # 1. Redistributions of source code must retain the above copyright 
  #    notice, this list of conditions and the following disclaimer. 
  # 
  # 2. Redistributions in binary form must reproduce the above copyright 
  #    notice, this list of conditions and the following disclaimer in the 
  #    documentation and/or other materials provided with the distribution. 
  # 
  # 3. Neither the name of the Institute nor the names of its contributors 
  #    may be used to endorse or promote products derived from this software 
  #    without specific prior written permission. 
  # 
  # THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
  # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
  # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
  # ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
  # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
  # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
  # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
  # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
  # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
  # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
  # SUCH DAMAGE. 
  
  def subList(l, sl) :
      """return the index of sl in l or None"""
      lLen  = len(l)
      slLen = len(sl)
      for i in range(lLen - slLen + 1):
          j = 0
          while j < slLen and l[i + j] == sl[j]:
              j += 1
          if j == slLen:
              return i
      return None
  
  