[Solved] changing persistent variables in a function

[GNVE]

So I have a preferences screen with several options to customize a players experience. I did want to add a couple of quick select buttons. Now I could use screen language to make the quickselects but it has some pitfalls and makes it all very unreadable. So I wanted to put everything in a function. I have found out however that Ren'Py ignores all logic in the function and takes whatever is set last as the new setting. It won't even allow the buttons to change the persistent variables anymore.
I have tried googling what I've been doing wrong and tried several permutations to get it to work but I don't seem to get anywhere. What am I missing? Is it even possible? The intention is to encourage several playthroughs so I don't want the player to setup preferences multiple times hence the choice for persistent variables.

(just a small sample)

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default persistent.var1 = True 
default persistent.var2 = True 
default persistent.var3 = True 
default persistent.var4= 'off' 

and the accompanying code for the function (again just a sample for clarity):

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Python:
    def otherswitch(setting,perma='',switch=''):

        if setting == 'off':
            persistent.var1 = False
            persistent.var2 = False
            persistent.var3 = False
            persistent.var4 = 'off'
        elif setting == 'level2':
            persistent.var1 = True
            persistent.var2 = True
            persistent.var3 = True
            persistent.var4 = 'off'

[hell_oh_world]

How are you calling this function?
If through the screen you need to use Function().

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screen test():
  button action Function(otherswitch, "off")

[GNVE]

That solved it OMG Thank you! I called the function as a regular function in screen language. I had been stumped for about a week now! Never would have caught that. I am happy it was a relatively small issue.