python tkinter 按钮命令不起作用

Question

I'm trying to create a program in python tkinter which user first have to login, then the first page is closed and new one opens with some buttons inside.

button must change it's color and text on click but it does not do anything

from tkinter import *


def button_clicked(button):
    Button(button).configure(bg="red", text="not Active")


def open_setting_page():
    loginPage.destroy()
    setting_page = Tk()
    setting_page.title("Setting")
    setting_page.geometry("400x300")

    b2 = Button(setting_page, text="Active", height=5, width=10, bg="green",command=lambda:button_clicked(b2)).grid(row=0, column=0)
    b3 = Button(setting_page, text="Active", height=5, width=10, bg="green",command=lambda:button_clicked(b3)).grid(row=0, column=1)
    setting_page.mainloop()






#program starts here

loginPage = Tk()
loginPage.title("Security System")
loginPage.geometry("400x300")
Label(text="\n\n\n\n").pack()
l1 = Label(text="Enter Password:")
l1.pack()

password_entry = Entry()
password_entry.insert(0, "Enter Your Password...")
password_entry.pack()
b1 = Button(text="Login", command=open_setting_page)
b1.pack()
loginPage.mainloop()

I want the buttons color and text be changed on click but noting happens when I click it.

Answer 1

there are two problems in this code:

1. in open_setting_page() -> the variables b2 and b3 become None because Button(XXX).grid() returns None -> lets separate the button creation and the grid placement into 2 steps.
2. in button_clicked(button) function -> Button(button).configure is wrong. it should be button.configure(XX) to get hold of the button that you gave to the function.

Here is how these two functions could look like:

def button_clicked(button):
    button.configure(bg="red", text="not Active")


def open_setting_page():
    loginPage.destroy()
    setting_page = Tk()
    setting_page.title("Setting")
    setting_page.geometry("400x300")

    b2 = Button(setting_page, text="Active", height=5, width=10, bg="green", command=lambda: button_clicked(b2))
    b3 = Button(setting_page, text="Active", height=5, width=10, bg="green", command=lambda: button_clicked(b3))
    b2.grid(row=0, column=0)
    b3.grid(row=0, column=1)

    setting_page.mainloop()