configa_filename = sys.argv[1]
configb_filename = sys.argv[2]
- a = readconfig(file(configa_filename))
- b = readconfig(file(configb_filename))
+ try:
+ a = readconfig(file(configa_filename))
+ b = readconfig(file(configb_filename))
+ except (IOError):
+ e = sys.exc_info()[1]
+ print("I/O error[%s]: %s\n" % (e.args[0],e.args[1]))
+ usage()
# print items in a but not b (accumulate, sort and print)
old = []