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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def options(self, parser, env=None):
 """ Adds command-line options for this plugin. """

        if env is None:
            env = os.environ
        env_opt_name = 'NOSE_%s' % self.__dest_opt_name.upper()
        parser.add_option("--%s" % self.__opt_name,
                          dest=self.__dest_opt_name,
                          type="string",
                          default=env.get(env_opt_name),
                          help=".ini file providing the environment for the "
                               "test web application.")