What is the source code of the “this” module doing?

Question

If you open a Python interpreter, and type \"import this\", as you know, it prints:

The Zen of Python, by Tim Peters

Beautiful is better

Answer 1

If you want to make the ROT13 substitution by hand - or in your head - you can check that because 13*2 = 26 (the number of the letters of the English alphabet), it's essentially an interchange:

a <-> n
b <-> o
c <-> p
...
m <-> z

A <-> N
B <-> O
C <-> P
...
M <-> Z 

Vs lbh cenpgvfr ybat rabhtu, lbh'yy riraghnyyl znfgre gur Mra bs EBG-13 nytbevguz naq ernq guvf Xyvatba ybbxvat grkgf jvgubhg pbzchgre uryc.