Anyone who can help me. How to add a variable to the text of a MDLabel?

[Arnav Vats]

If this is my label how to make the text change according to the variable

MDLabel:
    id:label1
    text:"info"

[Elliot Garbus]

Here is an example of 3 ways to write text to a label.

There top button does the update all in kv.

The middle button used the id of the label to update the text property of the label.

The bottom button modifies a kivy property that is bound to the label text.

 

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import StringProperty


kv = """
RootBoxLayout:
    orientation: 'vertical'
    Label:
        text: 'Write to a Label'
    BoxLayout:
        size_hint_y: None
        height: 48
        Label:
            id: label_1
            text: 'info'
        Button:
            text: 'update label'
            on_release:  label_1.text = 'Updated text, all in kv'
    BoxLayout:
        size_hint_y: None
        height: 48
        Label:
            id: label_2
            text: 'info'
        Button:
            text: 'update label'
            on_release:root.update_label_2()
    BoxLayout:
        size_hint_y: None
        height: 48
        Label:
            id: label
            text: root.label_3_text
        Button:
            text: 'update label'
            on_release: root.update_property()
"""


class RootBoxLayout(BoxLayout):
    label_3_text = StringProperty('info')

    def update_label_2(self):
        self.ids.label_2.text = 'updated text; python writes to label'

    def update_property(self):
        self.label_3_text = 'updated test, write to kivy property'


class WriteLabelApp(App):
    def build(self):
        return Builder.load_string(kv)


WriteLabelApp().run()

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