def METHOD_NAME(self):
    """Initialise actuator_name, username, read_only and default_value
    properties.
    """
    self.actuator_name = self.get_property("actuator_name")
    self.read_only = self.get_property("read_only") or False
    self.default_value = self.get_property("default_value")
    if self.default_value is not None:
        self.update_value(self.default_value)
    limits = self.get_property("default_limits")
    if limits:
        try:
            self._nominal_limits = tuple(literal_eval(limits))
        except TypeError:
            print("Invalid limits")
    self.username = self.get_property("username")