# Tk_counting_upward.py

# Tk_counting_upward.py

import tkinter as tk

def counter_label(label):
    def count():
        label['text'] += 1
        label.after(1000,count)
    count()


root = tk.Tk()
root.title ("Counting Upward")
label = tk.Label(root, fg = "green")
label.pack()
label['text'] = -1
button = tk.Button(root, text='Stop', width=25, command=root.destroy)
button.pack()
counter_label(label)
root.mainloop()