title: How do I execute a callback when the Enter key is pressed after entering text into a Text widget?
body: <p>I've really tried to find this out but have only discovered disconnected snippets such as <code>tag_bind</code>. I cannot work out how to use this (if indeed this is the right way forward).</p>
  
  <p>I've got a Text widget into which the user can enter some text (such as a command or question) and I'd like to execute a function that reads that text then responds to it. Obviously I could provide a nearby Button widget which when clicked, reads the text in the Text widget. But I don't want people to have to move their hand from the keyboard to the mouse. I'd just like the callback to be triggered if they hit the Enter key. How do I do it please?</p>