How to make "view passwords"?

I'm making password recognition system, and I want to make "View Passwords" function, which can switch hide to show passwords. I have no idea how to make this function.

Here is my brief code:

from tkinter import *

root=Tk()

#Entry box to get password from users
getPassword = Entry(root, show='*').pack()

I am stuck here. I don't even know whether I should use Button() or other function such as checkbox to make "View Passwords" function.

Do you have any good idea to fix this?

Solution

You can use the universal widget methods cget() and config() to get and set the current show option of your Entry widgets to define a function to toggle the display of contents of the Entry widget(s). You can then make the function the call-back command of a Button. You could also use it with Radiobutton or ttk.Checkbutton widgets in a similar manner.

Here's a runnable example to illustrate what I'm saying:

import tkinter as tk

HIDE_CHAR = '*'

def toggle_password_display():
    show = HIDE_CHAR if not password_entry.cget('show') else ''
    password_entry.config(show=show)

root = tk.Tk()

# Entry box to get password from users.
password_entry = tk.Entry(root, show=HIDE_CHAR)
password_entry.pack()

toggle_btn = tk.Button(root, text='Toggle password display', command=toggle_password_display)
toggle_btn.pack()

root.mainloop()

Before and after clicking the Button: