Create buttons on kivy automatically with different names using python

I'm trying to create buttons with a for, but I want every button to have a different name, so I can later differenciate them and use them easily. As you can see on the screenshot, python doesn't accept the names for the button. There's probably an easy way to do this but I just don't know it and I couldn't find it by myself on forums or anything else. (Also I know I can use a GridLayout but I need BoxLayouts to every button have coordinates.) Thx for your help

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