# L-28 MCS 260 Wed 31 Oct 2007 : readfilename3.py
#
# Prompts the user for a file name and displays
# an error message if the name given by the user
# does not correspond to a file.

class FileNotThere(IOError):
   """
   The exception FileNotThere is raised when a
   file does not exist.  The argument of the
   exception is the file name.
   """
   def __init__(self,name=''):
      self.name = name

name = raw_input('Give the name of a file : ')
try:
   try:
      file = open(name,'r')
   except IOError:
      raise FileNotThere(name)
except FileNotThere,e:
   print 'file ' + e.name + ' does not exist'