Effective pandas part 1 - 'modern-1-url.txt

[kmsnyde]

To setup the same flight data in part 1, it calls for the following to set up the data variable; however, I can't find the text file ('modern-1-url.txt') to pull the data set. Where is this text file or what is in it?

with open('modern-1-url.txt', encoding='utf-8') as f:
data = f.read().strip()