Python optparse: parse.error()---->TypeError: error() missing 1 required positional argument: 'msg' -
i having trouble running trace route module on new python 3.4.3. on previous versions of python able run module yet unable to. keep receiving traceback error when try calling parser.error() function of optparse.
typeerror: error() missing 1 required positional argument: 'msg'* here snippet of code
if __name__ == "__main__": parser = optparse.optionparser(usage="%prog [options] hostname") parser.add_option("-p", "--port", dest="port", help="port use socket connection [default:%default]", default=33434, metavar="port") parser.add_option("-m", "--max-hops", dest="max_hops", help="max hops before giving [default: %default]", default=30, metavar="maxhops") (options, args) = parser.parse_args() if len(args) != 1: parser.error() else: dest_name = args[0] sys.exit(main(dest_name=dest_name, port=int(options.port), max_hops=int(options.max_hops))) the error keeps occuring @ "if" statement
if len(args) != 1: parser.error() i tried this
if len(args) != 1: parser.error("incorrect number of arguments") when tried run module time received error instead
usage: traceroute.py [options] hostname traceroute.py: error: incorrect number of arguments
i love feedback on how fix code in order prevent error , more information on how use optparse library in python 3.4.3
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