exreg | A module to generate strings to match regular expressions | Regex library

i am learning from python online course regarding open & read file. Stumble upon one of the code line

data = "{:^13} {:<11} {:<6}\n"

One of the response obtained as below. However, I am still not clear of the following

1. In the response, it is mentioned which will come at position of 13 , 11 and 6

What does it mean by position? is it similar to index?

1. what does the notation "^", "<" and {:} represent?

2. why use eg {:^13} instead of str(data.format(rnd10000,9999)

unclear clarification