Problem passing argument to functionin inTkinter frame

[ericwm7248]

This is the method I have inside a Tkinter frame which I am trying to call using key_press() but get the error.


ERROR MESSAGE

Error:
Traceback (most recent call last):
  File "/home/eric/Python_Projects/Window1.py", line 53, in <module>
    key_press()
TypeError: key_press() takes exactly 1 argument (0 given)

I am struggling to find out which argument to pass.
I am probably making a rookie error here but cannot see the wood from the trees so need some help please.

The function runs ok in IDLE without the call.
CODE SNIPPET

main_window =Tk()

def key_press(event):
   
    if event.keysym == "1":   #if key pressed = 1 then go to next frame
        print ("Next")
    elif event.keysym == "9": # if key pressed = 9 then quit application.
        print ("Quit")
       
    main_window.bind("<Keys>", key_press)

key_press() #call key_press function


main_window.mainloop()

buran write Sep-11-2023, 12:27 PM:
Please, use proper tags when post code, traceback, output, etc. This time I have added tags for you.
See BBcode help for more info.

[buran]

You need to bind the callback function, not call it directly. in that case when you press a key, it will fire an event that will be passed automatically as an argument

import tkinter as tk

main_window = tk.Tk()
 
def key_press(event):
    
    if event.keysym == "1":   #if key pressed = 1 then go to next frame
        print ("Next")
    elif event.keysym == "9": # if key pressed = 9 then quit application.
        print ("Quit")

main_window.bind("<Key>", key_press)
main_window.mainloop()

[ericwm7248]

Thank You, understand now works fine.

[deanhystad]

You bind the keypress event once, not each time the event occurs.

The event name is <Key>, not <Keys>.

When you called key_press() you did not pass an event argument.

You should not use wildcard imports (from tkinter import *).

Next time you post, post the error message and a complete, runnable example. At least runnable enough to demonstrate the problem.