Get a specific canned key

        :type value: str
        :param value: Canned key to show

        :rtype: dict
        :return: A dictionnary containing canned key description

def show_key(self, value):
        """
        Get a specific canned key

        :type value: str
        :param value: Canned key to show

        :rtype: dict
        :return: A dictionnary containing canned key description
        """
        keys = self.get_keys()
        keys = [x for x in keys if x['label'] == value]
        if len(keys) == 0:
            raise Exception("Unknown key")
        else:
            return keys[0]