Python quine

A quine programor quinepython quine, is a program that outputs its own source code when run. Instead, it must compute its own source code. The trick is getting the string just right.

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Python quine

This post is a few years old now, so some details or my opinions might be out of date. I would still love to hear your feedback in the comments below. A self printing program is, as is its name, self explanatory. Today I thought about how to implement a quine in Python, I whipped up a solution on my own and then posed the challenge to some people in the office. These are the results:. This exemplifies a common way to implement a quine - the main problem is that you have to use some sort of function that prints. But of course, you also have to print that function, and so on. The way to deal with this is put the entire program in a string, except the assignment to that string, then print the assignment where you can use the string itself to avoid explicitly writing it again, thus avoiding the recursion , and then the string. Next is a version that tries to solve this. This version while a bit cumbersome solves the quotation marks problem by just explicitly printing the ascii characters.

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I wouldn't say this is the most boring. In Python it is certainly an empty file. It was interesting to see the author work through the major obstacles one by one when writing a quine. Glad they didn't take the actual boring route! I wish the article talked about "the most boring nonempty quine".

So, first things first:. Roughly speaking, a quine is a self-reproducing program: if you run it, it generates itself. Devising the shortest possible quine in some given programming language is a common hackish amusement. The program is self-reproducing because the output of the program is the program itself. Go ahead and run it in your own shell! The following Quine is also interesting. I found it here when researching this article. However, the one-liner is interesting nonetheless:. The single underscore is a perfectly valid variable name.

Python quine

Hey everyone, this is an interesting tutorial about quine in Python. Quine is a program that does not take any input and outputs its own source code. We will see how we can write a quine program in Python in this tutorial. In this tutorial, we will write a Python quine program using the constructive method. We will be using eval and repr functions in our quine. This function executes a string of python code that is passed as a parameter. See the below code. The below python is the shortest quine.

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John von Neumann theorized about them in the s. Previous Coroutine in Python. Next is a version that tries to solve this. Thank you for your valuable feedback! Archived from the original on March 15, In vlang, string seems to truncate to 1 character, even though it takes an array, so you end up with this string [b] loop thing. If we add the appropriate data as the function params and use the trick to quote the strings we get a similar quine to before;. Here is a template with no data. Now instead of printing the same data string twice verbatim, the second time we transform the escaped quotes back into quotes. Packages 0 No packages published. This is very similar to our pseudocode example, except we use a function rather than a generic expression.

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In Python it is certainly an empty file. An interesting pattern reveals itself. Submit your entries in Dev Scripter today. The version that appears in several places on the web, including the Rosetta Code quine page, is a little different: it doesn't even write to standard output. Quines are possible in any Turing-complete programming language, as a direct consequence of Kleene's recursion theorem. Like Article Like. Share your suggestions to enhance the article. Contribute to the GeeksforGeeks community and help create better learning resources for all. There is nothing boring about this quine, that is the general approach that works in any language. We use cookies to ensure you have the best browsing experience on our website.