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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_toolbar_buttons(self):

 """Return toolbar buttons list."""

        buttons = []

        # Code to add the stop button
        if self.stop_button is None:
            self.stop_button = create_toolbutton(
                                   self,
                                   text=_("Stop"),
                                   icon=self.stop_icon,
                                   tip=_("Stop the current command"))
            self.disable_stop_button()
            # set click event handler
            self.stop_button.clicked.connect(self.stop_button_click_handler)
            if is_dark_interface():
                self.stop_button.setStyleSheet("QToolButton{padding: 3px;}")
        if self.stop_button is not None:
            buttons.append(self.stop_button)

        # Reset namespace button
        if self.reset_button is None:
            self.reset_button = create_toolbutton(
                                    self,
                                    text=_("Remove"),
                                    icon=ima.icon('editdelete'),
                                    tip=_("Remove all variables"),
                                    triggered=self.reset_namespace)
            if is_dark_interface():
                self.reset_button.setStyleSheet("QToolButton{padding: 3px;}")
        if self.reset_button is not None:
            buttons.append(self.reset_button)

        if self.options_button is None:
            options = self.get_options_menu()
            if options:
                self.options_button = create_toolbutton(self,
                        text=_('Options'), icon=ima.icon('tooloptions'))
                self.options_button.setPopupMode(QToolButton.InstantPopup)
                menu = QMenu(self)
                add_actions(menu, options)
                self.options_button.setMenu(menu)
        if self.options_button is not None:
            buttons.append(self.options_button)

        return buttons