CODEWITHSUNDEEP
python-3.xtkinterbutton
Manav
Manav

Reputation: 29

How to pass argument to function while binding it to a button

I have a simple program that makes two password boxes and two buttons that should show and unshow the text in their respective entry boxes. This is my current code:

import tkinter as tk

def show_stars(event):
    password.config(show="*")

def show_chars(event):
    password.config(show="")

root = tk.Tk()
root.title("Password")
password = tk.Entry(root, show="*")
password2 = tk.Entry(root, show="*")
password.grid(row=0, column=1)
password2.grid(row=1, column=1)
password_label = tk.Label(text="Confirm Password:")
password_label.grid(row = 1, column=0)
password_label = tk.Label(text="Password:")
password_label.grid(row = 0, column=0)
button = tk.Button(text = '.')
button.bind("<ButtonPress-1>", show_chars)
button.bind("<ButtonRelease-1>", show_stars)
button.grid(row=0, column=2)
button2 = tk.Button(text = '.')
button2.bind("<ButtonPress-1>", show_chars)
button2.bind("<ButtonRelease-1>", show_stars)
button2.grid(row=1, column=2)

I want to make it so that I can pass an argument to the show_chars and show_stars function like this:

def show_stars(entry_box):
    entry_box.config(show="*")

def show_chars(entry_box):
    entry_box.config(show="")

button.bind("<ButtonPress-1>", show_chars(password))
button.bind("<ButtonRelease-1>", show_stars(password))
button2.bind("<ButtonPress-1>", show_chars(password2))
button2.bind("<ButtonRelease-1>", show_stars(password2))

So that it does not show and unshow the same entry box. Is there any way I can do this?

Upvotes: 1

Views: 43

Answers (1)

TheLizzard
TheLizzard

Reputation: 7710

Try this:

import tkinter as tk

def show_stars(entry_box):
    entry_box.config(show="*")

def show_chars(entry_box):
    entry_box.config(show="")


root = tk.Tk()

password = tk.Entry(root, show="*")
button = tk.Button(root, text="Show password")
password2 = tk.Entry(root, show="*")
button2 = tk.Button(root, text="Show password")

password.grid(row=1, column=1)
button.grid(row=1, column=2)
password2.grid(row=2, column=1)
button2.grid(row=2, column=2)

button.bind("<ButtonPress-1>", lambda event: show_chars(password))
button.bind("<ButtonRelease-1>", lambda event: show_stars(password))
button2.bind("<ButtonPress-1>", lambda event: show_chars(password2))
button2.bind("<ButtonRelease-1>", lambda event: show_stars(password2))

root.mainloop()

For more info on how to use lambda in python read this

You can also use functools.partial:

import tkinter as tk
from functools import partial

def show_stars(entry_box, event):
    entry_box.config(show="*")

def show_chars(entry_box, event):
    entry_box.config(show="")


root = tk.Tk()

password = tk.Entry(root, show="*")
button = tk.Button(root, text="Show password")
password2 = tk.Entry(root, show="*")
button2 = tk.Button(root, text="Show password")

password.grid(row=1, column=1)
button.grid(row=1, column=2)
password2.grid(row=2, column=1)
button2.grid(row=2, column=2)

command = partial(show_chars, password)
button.bind("<ButtonPress-1>", command)
command = partial(show_stars, password)
button.bind("<ButtonRelease-1>", command)

command = partial(show_chars, password2)
button2.bind("<ButtonPress-1>", command)
command = partial(show_stars, password2)
button2.bind("<ButtonRelease-1>", command)

root.mainloop()

For more info on functools.partial read this.

Upvotes: 1

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