shell.py 文件源码

def __init__(self):

        def check_charset_option(option, opt_str, value, parser):
            """Value must be a valid charset"""
            try:
                dummy = codecs.lookup(value)
            except LookupError, e:
                raise optparse.OptionValueError(
                    "Charset '%s' in unknown or not supported by your sytem."
                    % value)
            setattr(parser.values, option.dest, value)
            return

        parser = optparse.OptionParser(
            usage=USAGE % (VERSION, self.__class__.__doc__),
            version=VERSION)
        parser.add_option(
            '-c', '--charset', dest='charset', default=DEFAULT_CHARSET,
            type='string', action='callback', callback=check_charset_option,
            help="Converts output to this charset (default %s)" % DEFAULT_CHARSET
            )
        parser.add_option(
            '-v', '--verbosity', dest='verbosity', default=0, action='count',
            help="Adds verbosity for each '-v'")
        self.options, self.args = parser.parse_args()
        if (len(self.args) < 2
            or self.args[0] not in self.commands.keys()):
            parser.error("Invalid arguments")
        self.filenames = self.args[1:]
        return