I have a test application which contains an Accordion. I want to be able to add items to the Accordion from within my python code.

Here is the relevant kv code:

<LayoutTest>:
    BoxLayout:
        id: mainBox
        BoxLayout:
            orientation: 'vertical'
            canvas:
                Color:
                    rgba: 0.16, 0.11, 0, 1  # brownish color
                Rectangle:
                    pos: self.pos
                    size: self.size

            TabbedPanel:
                id: tp
                do_default_tab: False

                TabbedPanelItem:
                    id: tab_1
                    text: 'Tab1R'
                    on_release: app.showTab1R()
                    ListView:
                        id: tab1_list
                        orientation: 'vertical'

<ListItem@AccordionItem>:
    title: '2024/12/20  22:00    <some text>'
    BoxLayout:
        orientation: 'vertical'
        Label:
            text: 'Type 1'
            text_size: self.width, None
        Label:
            text: 'Content 3'
            text_size: self.width, None

<ListView@BoxLayout>:
    Accordion:
        id: accordyN
        orientation: 'vertical'

        AccordionItem:
            title: '2024/12/20  00:00    <some text>'
            BoxLayout:
                orientation: 'vertical'
                size_hint_y: None
                # height: self.minimum_height
                # height: type_label.height + content_label.height
                valign: 'top'
                Label:
                    id: type_label
                    text: 'Type 1'
                    text_size: self.size
                    halign: 'left'
                    valign: 'top'
                Label:
                    id: content_label
                    text: 'Content 1'
                    text_size: self.size
                    halign: 'left'
                    valign: 'top'

        AccordionItem:
            title: '2024/12/20  09:00    <some text>'
            BoxLayout:
                orientation: 'vertical'
                Label:
                    text: 'Type 1'
                    text_size: self.width, self.height
                Label:
                    text: 'Content 2'
                    text_size: self.width, self.height

Using this layout, my application can display the Accordion, as well as the two sample AccordionItems shown above.

In my Python code, I somehow need to access the Accordion in order to add widgets to it. Here’s my code which doesn’t work:

...
    def showTab1R(self):
        self.updateList(None)

    def updateList(self):
        entry = ListItem(title='2024/12/20  22:00    <some text>')
        mainBox.accordyN.add_widget()

In the Python code above, ListItem and mainBox are unrecognized (‘not defined’). How do I access these kv widgets from my Python code?