How to use the pydm.data_plugins.is_read_only function in pydm

def send_access_state(self, read_access, write_access, *args, **kws):
        if is_read_only():
            self.write_access_signal.emit(False)
            return

        if write_access is not None:
            self.write_access_signal.emit(write_access)

def send_access_state(self, read_access, write_access, *args, **kws):
        if is_read_only():
            self.write_access_signal.emit(False)
            return

        if write_access is not None:
            self.write_access_signal.emit(write_access)

def is_read_only(self):
        warnings.warn("'PyDMApplication.is_read_only' is deprecated, "
                      "use 'pydm.data_plugins.is_read_only' instead.")
        return data_plugins.is_read_only()

def put_value(self, new_val):
        if is_read_only():
            return

        if self.pv.write_access:
            try:
                self.pv.put(new_val)
            except Exception as e:
                logger.exception("Unable to put %s to %s.  Exception: %s",
                                 new_val, self.pv.pvname, str(e))

def check_enable_state(self):
        """
        Checks whether or not the widget should be disable.
        This method also disables the widget and add a Tool Tip
        with the reason why it is disabled.

        """
        status = self._write_access and self._connected and self._has_enums
        tooltip = ""
        if not self._connected:
            tooltip += "Channel is disconnected."
        elif not self._write_access:
            if data_plugins.is_read_only():
                tooltip += "Running PyDM on Read-Only mode."
            else:
                tooltip += "Access denied by Channel Access Security."
        elif not self._has_enums:
            tooltip += "Enums not available."

        self.setToolTip(tooltip)
        self.setEnabled(status)

def check_enable_state(self):
        """
        Checks whether or not the widget should be disable.
        This method also disables the widget and add a Tool Tip
        with the reason why it is disabled.
        """
        status = self._write_access and self._connected
        tooltip = self.restore_original_tooltip()
        if not self._connected:
            if tooltip != '':
                tooltip += '\n'
            tooltip += "PV is disconnected."
        elif not self._write_access:
            if tooltip != '':
                tooltip += '\n'
            if data_plugins.is_read_only():
                tooltip += "Running PyDM on Read-Only mode."
            else:
                tooltip += "Access denied by Channel Access Security."
        self.setToolTip(tooltip)
        self.setEnabled(status)