Jun-24-2020, 07:55 PM
(This post was last modified: Jun-24-2020, 07:55 PM by francois072.)
from tkinter import * root = Tk() # Display root.title("Simple Calculator") display = Entry(root, width=25).grid(row=0, column=0, columnspan=3, padx=10, pady=20) # commands def button_click(number): display.delete(0, END) display.insert(0, number) # buttons numbers button_1 = Button(root, text="1", padx=20, pady=15, command=lambda: button_click(1)).grid(row=3, column=0) button_2 = Button(root, text="2", padx=20, pady=15, command=lambda: button_click(2)).grid(row=3, column=1) button_3 = Button(root, text="3", padx=20, pady=15, command=lambda: button_click(3)).grid(row=3, column=2) button_4 = Button(root, text="4", padx=20, pady=15, command=lambda: button_click(4)).grid(row=2, column=0) button_5 = Button(root, text="5", padx=20, pady=15, command=lambda: button_click(5)).grid(row=2, column=1) button_6 = Button(root, text="6", padx=20, pady=15, command=lambda: button_click(6)).grid(row=2, column=2) button_7 = Button(root, text="7", padx=20, pady=15, command=lambda: button_click(7)).grid(row=1, column=0) button_8 = Button(root, text="8", padx=20, pady=15, command=lambda: button_click(8)).grid(row=1, column=1) button_9 = Button(root, text="9", padx=20, pady=15, command=lambda: button_click(9)).grid(row=1, column=2) button_0 = Button(root, text="0", padx=20, pady=15, command=lambda: button_click(0)).grid(row=4, column=0) # buttons functions button_add = Button(root, text="+", padx=19, pady=15, command=button_click).grid(row=5, column=0) button_equal = Button(root, text="=", padx=56, pady=15, command=button_click).grid(row=5, column=1, columnspan=2) button_clear = Button(root, text="CLEAR", padx=42, pady=15, command=button_click).grid(row=4, column=1, columnspan=2) root.mainloop()
Error:Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python3.8/tkinter/__init__.py", line 1883, in __call__
return self.func(*args)
File "/run/media/francois/Bulk Storage/PycharmProjects/test1/Tkinter_GUI.py", line 20, in <lambda>
button_3 = Button(root, text="3", padx=20, pady=15, command=lambda: button_click(3)).grid(row=3, column=2)
File "/run/media/francois/Bulk Storage/PycharmProjects/test1/Tkinter_GUI.py", line 13, in button_click
display.delete(0, END)
AttributeError: 'NoneType' object has no attribute 'delete'
I did check with this Python website's Tkinter page:https://realpython.com/python-gui-tkinterbut I couldn't find what I did wrong.