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Tkinter: How to change state to disable/enable Button or other widget

You can deactivate button with

button.config(state="disabled")

and activate it back with

button.config(state="normal")

eventually 

button.config(state="active")

The same way you can also deactivate other widgets - ie. Label, Entry, etc.

Other widgets may have different states - ie. Entry has state "readonly" (but it doesn't have "active")

Minimal working example

import tkinter as tk  # PEP8: `import *` is not preferred

# --- functions ---

def on_press_1():
    b1.config(state="disabled")
    l1.config(state="disabled")
    e1.config(state="disabled")  # or `readonly`

def on_press_2():
    b1.config(state="normal")  # or `active`
    l1.config(state="normal")  # or `active`
    e1.config(state="normal")

# --- main ---

root = tk.Tk()

l1 = tk.Label(root, text="Label Text")
l1.pack()

e1 = tk.Entry(root)
e1.insert(0, "Entry Text")
e1.pack()

b1 = tk.Button(root, text="Deactivate", command=on_press_1)
b1.pack()

b2 = tk.Button(root, text="Activate", command=on_press_2)
b2.pack()

root.mainloop()
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