Python: Tkinter pausing a while loop
<p>So i'm trying to create a program that displays the cpu usage of your computer in real time. I wanted to use tkinter to add some buttons to the program. I decided to add a stop button that closes the program and a pause button that stops the cpu usage from updating. I was able to create the stop button but when I started the pause button I realized that I was unable to pause the while loop I using. Does anyone know what i'm doing wrong?</p>

<pre><code>from tkinter import *
import psutil
from time import sleep

root = Tk()
var = StringVar()

label = Label( root, textvariable=var, relief=GROOVE, height=3, width=6, bd=4)
f = Frame(root, height=100, width=180)
f.pack_propagate(0)
f.pack()
stop=0
def pause1():
    stop=1
    print('It works')
def findcpu():
    if stop==0:
        root.update()
        sleep(0.001)
        cpu = psutil.cpu_percent(interval=1, percpu=False)
        var.set(cpu)
        label.pack()
        root.update()
    elif stop==1:
        print('It really works')
        loop=1 

class pauseButton(Button):
    def __init__(self, parent):
        Button.__init__(self, parent)
        self['text']= 'pause'
        self['bg']='orange'
        self['height']=3
        self['width']=6
        self['bd']=4
        self['relief']=GROOVE
        self.button=Button(self)
        self['command']=pause1        
        self.pack(side=LEFT)   
class quitButton(Button):
    def __init__(self, parent):
        Button.__init__(self, parent)
        self['text'] = 'End'
        self['bg']='red'
        self['height']=3
        self['width']=6
        self['bd']=4
        self['padx']=0
        self['pady']=0
        self['relief']=GROOVE
        self['activebackground']='brown'
        self.button = Button(self)
        self['command'] = parent.destroy
        self.pack(side=RIGHT)
quitButton(root)
pauseButton(root)
loop=0
stop=0
num1=0
num2=1

while loop==0:
    findcpu()


root.mainloop()
print('Done')
</code></pre>