NITROX.py

#!/usr/bin/python3
# -*- coding: utf-8 -*-

from tkinter import *
from O2SENSOR import *

class App:

        def fac_up(self):
                global FAC_S0
                FAC_S0 -= .3
                self.fac_label.configure(text=FAC_S0, fg = "red")

        def fac_down(self):
                global FAC_S0
                FAC_S0 += .3
                self.fac_label.configure(text=FAC_S0, fg= "red")


        def __init__(self, master):
                global FAC_S0
                self.master = master
                frame = Frame(master)
                frame.pack()

                label = Label(frame, text = 'Dive Tools', font = ("Helvetica", 32))
                label.grid(row = 0)

                label = Label(frame, text='NITROX ANALYZER', font=("Helvetica", 32))
                label.grid(row=1)

                self.reading_label = Label(frame, text='12.34', font=("Helvetica", 64))
                self.reading_label.grid(row=2)

                self.mod_label = Label(frame, text='123', font=("Helvetica", 64))
                self.mod_label.grid(row=3)
		
                label = Label(frame, text="", font=("Helvetica", 32))
                label.grid(row=4)

                self.fac_label = Label(frame, text=FAC_S0, font=("Helvetica", 24))
                self.fac_label.grid(row=5,column=0)
                
                up_btn = Button(frame, text="+",command=self.fac_up)
                up_btn.grid(row=5, column=1)

                down_btn = Button(frame, text="-",command=self.fac_down)
                down_btn.grid(row=5, column=2)

                FAC_S0 = FAC_S0
                self.update_reading()
                self.update_mod()

        def update_reading(self):
                O2_S0 = get_O2_S0()
                reading_str = "{:.2f}% O²".format(O2_S0)
                self.reading_label.configure(text=reading_str)
                self.master.after(500, self.update_reading)

        def update_mod(self):
                MOD_S0 = ((1.4 / (get_O2_S0() * .01)) - 1) * 33
                mod_str = "MOD = {:.0f}".format(MOD_S0)
                self.mod_label.configure(text=mod_str)
                self.master.after(500, self.update_mod)

root = Tk()
root.wm_title('Dive Tools --- NITROX ANALYZER')
app = App(root)
root.geometry("800x450+0+0")
root.mainloop()