2021 Not all solutions are working

[JCCapgemini]

I wanted to use your solution as reference for the 2021 day 13 puzzle, but when I execute I get the following error:

Traceback (most recent call last):
  File "C:/Users/jcroce/develops/c/advent_code_21/p13e/day13p2.py", line 3, in <module>
    t, b = data.split("\r\n\r\n")
           ^^^^
NameError: name 'data' is not defined

If we check the code is clear that the data has not been set. By the look of the code (and testing it) adding the following two lines at the beginning make it work:

import sys
data = sys.stdin.read()

The split on "\r\n\r\n" does not work for me, changing it to "\n\n" makes it work:

t, b = data.split("\n\n")

Anyway, thank you so much for providing such precise solutions, it helps a lot!