Limit The Number Of New Windows To Open – Python Tkinter GUI Tutorial 185

In this video I’ll show you how to limit the number of new windows you create with your Tkinter app.

I’ve shown you how to open new windows in your app before, but in this video I’ll show you how to specify the exact number of new windows your app can open.

We’ll do it using a good old fashioned python counter and some if/else logic.

Python Code: windows.py
(Github Code)

from tkinter import *
from tkinter import messagebox

root = Tk()
root.geometry("300x200")
root.title('Learn To Code at Codemy.com')
root.iconbitmap('c:/gui/codemy.ico')

global counter
counter = 1

def open():
	global counter

	# Create counter logic
	if counter < 4:
		top = Toplevel()
		top.geometry("300x200")
		top.title('New Window')
		top.iconbitmap('c:/gui/codemy.ico')

		my_label = Label(top, text="New Window!", font=("Helvetica, 24"))
		my_label.pack(pady=50, padx=50)

		counter +=1
	else:
		messagebox.showinfo("Error", "Hey! You've already opened a new window!")


my_button = Button(root, text="Open Window", command=open)
my_button.pack(pady=50, padx=50)

mainloop()