Basic Timer In Tkinter

I have written some code for a python timer but when ever I run it I get an error but the thing is I don't know what to do so I came here for help after I searched all over the int

Solution 1:

You have to initiate global sec in start.ie:

......
# Timer Startdef start():
    global sec
    .....

you can put inside it in a class. so that you don't have to worry about the scope of variables..

from tkinter import *
import time

classApp():
    def__init__(self):
        self.window = Tk() 
        self.root = Frame(self.window, height=200,width=200)
        self.root.pack() 
        self.root.pack_propagate(0) 
        self.window.title('Timer')
        self.label = Label(text="")
        self.label.pack()
        self.sec = 0
        self.timerupdate()
        self.root.mainloop()
    deftimerupdate(self):
        self.sec = self.sec + 1
        self.label.configure(text=self.sec)
        self.root.after(1000, self.timerupdate)

app=App()
app.mainloop()