'How to do multiline python code in .kv file

So going with this short example:

GridLayout:
    id: matrixA
    cols: 1
    Button:
        on_press:
            for i in range(root.matrixArows):\
            for j in range(root.matrixAcols):\
            print(i)

I want to make nested for loop in my kivy file, however it keeps returning the error.

The root.matrixArows and cols exists and is being read propely for sure, I don't know if I am making something wrong with the syntax on multiline code.

python kivy

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'How to do multiline python code in .kv file

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