Last post of this year is a quine in python 3.
If you are interested in quines, you can find more ino in the post Quines: a new Hello World.
The quine I want to propose is a one line quine:
s='s=%r;print(s%%s)';print(s%s)
When you execute this script, its output is the script itself.
s='s=%r;print(s%%s)';print(s%s)
Some explanations are useful:
- The operator x % y means substitute the value y in the format string x, same way as C printf.
Also note that the %% specifier stands for a literal % sign so s%%s within the format string will print as s%s, and will not capture a string.
s is set to:
's=%r;print(s%%s)'
so the %r gets replaced by exactly that (keeping the single quotes) in s%s and the final %% with a single %, giving:
s='s=%r;print(s%%s)';print(s%s)
and hence the quine.
Here you are more quines in other languages: