Here is a clearer example you can play with in your IDE:

example = ["This will appear if condition is False, because it is at index = 0 in the list", "This will appear if condition is True, because it is at index = 1 in the list"][ 253 > 4 ]

print(example)

You can change the 253 > 4 to something that is False and see what happens.

Sorry, but i don't understend.
How worked the choise here?
Thanks.