import tkinter as tk
import random
import threading
start_status = False
calc_list=[]
rand = random.Random()

def randomGenerator():
    if start_status:
        outputs = []
        Out1= rand.randrange(0,100,1)
        Out2= rand.randrange(0,100,1)
        outputs.append(Out1)
        outputs.append(Out2)

        output_1.set(Out1)  #to display in the GUI
        output_2.set(Out2)
        calc_list.append(outputs)       #i am trying to rest this to empty #when i press start after pressing stopping.
        print(calc_list)
    win.after(1000, randomGenerator)

def start_me():
    global start_status
    start_status = True
    stopButton.config(state="normal")
    startButton.config(state="disabled")
    calcButton.config(state="disabled")
    calc_list=[]  #it doesn't work

def stop_me():
    global start_status
    start_status = False
    startButton.config(state="normal")
    stopButton.config(state="disabled")
    calcButton.config(state="normal")

def get_max_list(calc_list):
    return [max(x) for x in zip(*calc_list)]
win = tk.Tk()
win.geometry('800x800')


output_1 = tk.StringVar()
output_2 = tk.StringVar()
output_1_label = tk.Label(win, textvariable=output_1)
output_1_label.place(x=200, y=100)

output_2_label = tk.Label(win, textvariable=output_2)
output_2_label.place(x=200, y=200)

startButton = tk.Button(win, text="Start" command = lambda:threading.Thread(target = start_me).start())
startButton.place(x=200, y=500)

stopButton = tk.Button(win, text="Stop", state=tk.DISABLED,  command= lambda:threading.Thread(target = stop_me).start())
stopButton.place(x=200, y=600)

calcButton = tk.Button(win, text="calculate", state=tk.DISABLED, command= lambda:threading.Thread(target = get_max_list).start())
calcButton.place(x=200, y=700)

win.after(1000, randomGenerator)
win.mainloop()