Using tuples or Re to replace 5 strings with one

[Larz60+]

each item that comes after the format statement must have a corresponding '{}' in the print body.
thus, your statement:

print('Rock1[0]: {}, ROck1[4]: {}'.format(Rock1[0], Rock1[2], Rock1[3], Rock1[4]))

there is no slot for Rock[3] and Rock[4] doesn't exist! Remember this is zero based, so indexes are 0,1,2,3
You didn't use Rock[1] which is the second item in the list

See what I'm talking about?

it would have to be something like:

print('Rock1: {}, Rock2: {} Rock3: {} Rock4: {} '.format(Rock[0], Rock[1], Rock[2], Rock1[3]))