In [114]: conf = cfg.ConfigOpts()

In [115]: conf.register_opt(cfg.URIOpt('uri', schemes=["http", "https"]),
     ...:                              cfg.OptGroup(group_name))
Out[115]: True

In [116]: conf.register_opt(cfg.URIOpt('uri', schemes=["http", "https"]),
     ...:                              cfg.OptGroup(group_name))
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-116-46e0c7fb2a1c> in <module>()
      1 conf.register_opt(cfg.URIOpt('uri', schemes=["http", "https"]),
----> 2                              cfg.OptGroup(group_name))

/home/moguimar/.ve/oslo.config/lib/python2.7/site-packages/oslo_config/cfg.pyc in __inner(self, *args, **kwargs)
   2433         def __inner(self, *args, **kwargs):
   2434             if kwargs.pop('clear_cache', True):
-> 2435                 result = f(self, *args, **kwargs)
   2436                 self.__cache.clear()
   2437                 return result

/home/moguimar/.ve/oslo.config/lib/python2.7/site-packages/oslo_config/cfg.pyc in register_opt(self, opt, group, cli)
   2607                 self._add_cli_opt(opt, group)
   2608             self._track_deprecated_opts(opt, group=group)
-> 2609             return group._register_opt(opt, cli)
   2610
   2611         # NOTE(gcb) We can't use some names which are same with attributes of

/home/moguimar/.ve/oslo.config/lib/python2.7/site-packages/oslo_config/cfg.pyc in _register_opt(self, opt, cli)
   1903         :raises: DuplicateOptError if a naming conflict is detected
   1904         """
-> 1905         if _is_opt_registered(self._opts, opt):
   1906             return False
   1907

/home/moguimar/.ve/oslo.config/lib/python2.7/site-packages/oslo_config/cfg.pyc in _is_opt_registered(opts, opt)
    798     """
    799     if opt.dest in opts:
--> 800         if opts[opt.dest]['opt'] != opt:
    801             raise DuplicateOptError(opt.name)
    802         return True

/home/moguimar/.ve/oslo.config/lib/python2.7/site-packages/oslo_config/cfg.pyc in __ne__(self, another)
   1049
   1050     def __ne__(self, another):
-> 1051         return self._vars_for_cmp() != another._vars_for_cmp()
   1052
   1053     def __eq__(self, another):

/home/moguimar/.ve/oslo.config/lib/python2.7/site-packages/oslo_config/types.pyc in __eq__(self, other)
    900         return (
    901             (self.__class__ == other.__class__) and
--> 902             (self.value == other.value)
    903         )
    904

AttributeError: 'URI' object has no attribute 'value'