I keep getting this error: ValueError: invalid literal for int() with base 10: ''

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I'm trying to do my first project with tkinter: it's a gui password generator (I had already done a non-gui passwd generator with python so I'm sure the code to generate it is okay) but I'm having trouble in making the user's input an integer and I keep getting this error:

ValueError: invalid literal for int() with base 10: ''

Here's the code:

import tkinter as tk
import random

root = tk.Tk()

canvas = tk.Canvas(root, width=600, height=350)
canvas.grid()

#Labels
label1 = tk.Label(root, text = "How many characters?")
label1.place(x = 30, y = 50)
label2 = tk.Label(root, text = "How many passwords?")
label2.place(x = 30, y = 100)

#Entry box
box1 = tk.Entry(width = 20)
box1.place(x = 200, y = 50)

box2 = tk.Entry(width = 20)
box2.place(x = 200, y = 100)


answer = tk.Label(root, text = "")
answer.place(x = 260, y = 200)

pass_lenght = int(box1.get())
num_pass = int(box2.get())

def password_generator():
    characters = "abcdefghilmopqrstuvzxwjkyèàòìùABCDEFGHILMNOPQRSTUVZWJKYX1234567890!£$%&/()=?^*§ç°:_;€"
    for x in range(0, pass_lenght):
        empty_password = ""
        for x in range(0, num_pass):
            real_password = random.choice(caratteri)
            empty_password    = empty_password + real_password
        print("Here's your password: ", empty_password)

#Button
button = tk.Button(root, text = "Commit", command = password_generator())
button.place(x = 260, y = 150)


root.mainloop()
tkinter python
1 Answers
  1. command should be without brackets ()
  2. makes no sense to call pass_lenght = int(box1.get()) before any input

.

import tkinter as tk   
import random

root = tk.Tk()

canvas = tk.Canvas(root, width=600, height=350)
canvas.grid()

#Labels
label1 = tk.Label(root, text = "How many characters?")
label1.place(x = 30, y = 50)
label2 = tk.Label(root, text = "How many passwords?")
label2.place(x = 30, y = 100)

#Entry box
box1 = tk.Entry(width = 20)
box1.place(x = 200, y = 50)

box2 = tk.Entry(width = 20)
box2.place(x = 200, y = 100)


answer = tk.Label(root, text = "")
answer.place(x = 260, y = 200)



def password_generator():
    pass_lenght = int(box1.get())
    num_pass = int(box2.get())
    characters = "abcdefghilmopqrstuvzxwjkyèàòìùABCDEFGHILMNOPQRSTUVZWJKYX1234567890!£$%&/()=?^*§ç°:_;€"
    for x in range(0, pass_lenght):
        empty_password = ""
        for x in range(0, num_pass):
            real_password = random.choice(characters)
            empty_password    = empty_password + real_password
        print("Here's your password: ", empty_password)
    

#Button
button = tk.Button(root, text = "Commit", command = password_generator)
button.place(x = 260, y = 150)


root.mainloop()
Module_art0
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