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Quine in Python

  • Difficulty Level : Medium
  • Last Updated : 23 Apr, 2020

Quine is a program which takes no input but outputs a copy of its own code. We have discussed quine in C.

The shortest possible quine in python is just a single line of code!

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_='_=%r;print _%%_';print _%_

In case of Python3.x






_='_=%r;print (_%%_)';print (_%_)

Explanation:
The above code is a classic use of string formatting. Firstly, we are defining a variable _ and assigning it ‘_=%r;print _%%_’. Secondly, we are printing _%_. Here we are printing _ with _ as input to string formatting. So %r in _ gets the value of _. You can even use %s instead of %r. We used double % in ‘_=%r;print _%%_’ to escape %.

But you may say that the below code is the smallest, right!




print open(__file__).read()

You need to note that it is indeed the smallest python program that can print its own source code but it is not a quine because a quine should not use open() function to print out its source code.

This article is contributed by Sri Sanketh Uppalapati. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.




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