meaning - What does "would be in" mean in this sentence?

I text talks about a case like the following

if x:
   print("Hello")
else:
   print("Goodbye")

That's the correct way to format.
Wrong would be:

if x:
   print("Hello")
   else:
       print("Goodbye")

To prevent the wrong way from happening you have to hit the delete key after you wrote print("Hello") and presed <Enter>.

What's with the prompt? If you are in IDLE the correct text will look like:

>>> if x:
        print("hello")
else:
        print("goodbye")

The sentence says that if would be on the same height if the (>>>) wouldn't be there. As far as python is concerned if and else are on the same level on indention.