Validate the content of a text box in Tcl/Tk (tkinter). Generate a function in python that validates that the text does not exceed 10 characters

from tkinter import *
root = Tk()

def validate():
    print("Validating...")
    if len(txt.get()) > 10:
        print("Text too long!")
    else:
        print("Text is valid")
        
lbl = Label(root, text="Enter text:")
lbl.pack()

txt = Entry(root, width=100, validate="all", validatecommand=validate)
txt.pack()

root.mainloop()