Given the command-line arguments, this figures out which subcommand is
        being run, creates a parser appropriate to that command, and runs it.

def execute(self):
        """
        Given the command-line arguments, this figures out which subcommand is
        being run, creates a parser appropriate to that command, and runs it.
        """
        # Preprocess options to extract --settings and --pythonpath.
        # These options could affect the commands that are available, so they
        # must be processed early.
        parser = NewOptionParser(prog=self.prog_name,
                             usage=self.usage_info,
#                             version=self.get_version(),
                             formatter = NewFormatter(),
                             add_help_option = False,
                             option_list=self.option_list)

        options, args = parser.parse_args(self.argv)
        self.options = options
        if len(args) == 0:
            self.message("You should give at least one package name.", 'error')
            return

        subcommand = args[0]

        self.handle(args[1:], self.options, self.global_options, subcommand)