from tkinter import *
import random
 
root = Tk()
e1 = Entry(width=50)
 
 
def insert():
    e1.delete(0, 'end')
    password = ""
    for i in range(0,10):
     password += chr(random.randrange(97, 97 + 26))
    e1.insert(0, password)
    
 
 
but = Button(text="Генерировать пароль", command=insert)
e1.pack()
but.pack()
root.mainloop()