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How can i use callback and update class variable

I am trying to update a class variable on interrupt callback from a physical switch

### .py

class Mode1(Screen):

    var= 0

    def my_callback(channel,self):
        self.var+=20

    gpio.add_event_detect(17, gpio.RAISING, callback=my_callback)

I need to update the variable when a physical button connected via raspberry pi is pressed. The Pressing of Button must be an interrupt/callback

Solution

  • When updating a class variable, do it inside a classmethod

    class Mode1(Screen):
    var = 1
    @classmethod
    def my_callback(cls, channel):
        cls.var += 20
gpio.add_event_detect(17, gpio.RAISING, callback=Mode1.my_callback)