title: Tkinter Button Disabled Until Entry is Filled
body: <p>I am new to coding and I have been working in Tkinter trying to make a number guessing game.</p>
  <p>I would like to have something where I have an entry box that the user can input a number and then a &quot;Guess&quot; button to submit the guess to see if the guess matches the secret number.</p>
  <p>I would like to do something where the &quot;Guess&quot; button is grayed out and unclickable until a user inputs an appropriate datatype (int) into the entry box.</p>
  <p>Is there any way I can do this? I know how to create entry boxes and buttons, I just don't know how to relate the two to have the button be gray when there is no input.</p>