setup() is only called once. You might like to call a function/method for changed values. Search for Slider Attributes => Slider.action

not tested:

def setup(self):
        slider = self.view.superview['slider1']
        slider.action = self.slider_changed

def slider_changed(self, sender):
        print(sender.value)

First letter a small „i“ and the second letter is any other small letter. In my example = ['is', 'is', 'ia', 'in']

Python 3.x cheat sheet

Settings > Discord > Open Pyto

class User_Input_Date():
    def __init__(self):

        self.month_input = input('What was the month (1-12)')
        if self.month_input in ['01', '1', 'Jan', 'January', 'jan', 'january']:
            self.month_input = 1
        elif self.month_input in ['02', '2', 'Feb', 'February', 'feb', 'february']:
            self.month_input = 2
        elif self.month_input in ['03', '3', 'Mar', 'March', 'mar', 'march']:
            self.month_input = 3
        else:
            self.month_input = None
        self.year_input = int(input('What was the year?'))
        
    def printDate(self):
        print(f'year = {self.year_input} month = {self.month_input}')
        
primary_bariatric_date = User_Input_Date()
primary_bariatric_date.printDate()

You store the variables with self.name instead returning it.

button1.frame = (x, y,width,height)
button2.frame = (x, y,width,height)

v.add_subview(button1)
v.add_subview(button2)

    def draw(self):
        self.iv.image.draw(0,0,self.width,self.height)

you can only fit your image or you might like to calculate the screen ratio first...

with Pythonista 3.2 +

#...
        self.iv.image = ui.Image.named('lock_screen.png')

    def draw(self):
      self.iv.image.draw()
#...

it worked for me

edit: btw. leave out the ImageView is also possible

#...
        #self.iv = ImageView()
        #self.iv...
        self.image = ui.Image.named('lock_screen.png')

    def draw(self):
      self.image.draw()
#...

I don't use pytube, but youtube-dl is working pretty well for me.

You only set the action function of your first button (4 times).

b_top1.action = button_tapped

In this function you need to test the self.title (SUM, DIV, ...) if you want to use it for all four operations.