<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_conf_attr(self, attr, default=None):
 """ Get the value of a attribute in the configuration :param attr: The attribute :param default: If the attribute doesn't appear in the configuration return this value :return: The value of attribute in the configuration or the default value """

        if attr in self.conf:
            return self.conf[attr]
        else:
            return default