sort values and format output for viewing and comparing in test scenarios

def pretty(self):
        "sort values and format output for viewing and comparing in test scenarios"
        pretty_obj = OrderedDict()
        for key, value in sorted(iteritems(self.__dict__)):
            if value is None:
                pretty_obj[key] = None
            elif is_str_or_unicode(value):
                pretty_obj[key] = self.__dict__.get(key)
            elif isinstance(value, list):
                pretty_obj[key] = []
            elif isinstance(value, dict):
                pretty_obj[key] = {}
            else:
                pretty_obj[key] = unicode_value(value)
        return pretty_obj