Python quine

This post is a few years old now, python quine, so some details or my opinions might be out of date. I would still love to hear your feedback in the comments below.

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Python quine

A quine is a computer program which takes no input and produces a copy of its own source code as its only output. The standard terms for these programs in the computability theory and computer science literature are "self-replicating programs", "self-reproducing programs", and "self-copying programs". A quine is a fixed point of an execution environment, when that environment is viewed as a function transforming programs into their outputs. Quines are possible in any Turing-complete programming language, as a direct consequence of Kleene's recursion theorem. For amusement, programmers sometimes attempt to develop the shortest possible quine in any given programming language. The idea of self-reproducing automata came from the dawn of computing, if not before. John von Neumann theorized about them in the s. The "download source" requirement of the Affero General Public License is based on the idea of a quine. In general, the method used to create a quine in any programming language is to have, within the program, two pieces: a code used to do the actual printing and b data that represents the textual form of the code. The code functions by using the data to print the code which makes sense since the data represents the textual form of the code , but it also uses the data, processed in a simple way, to print the textual representation of the data itself.

Most of the examples so far have leaned on high level string methods, but the data can really be anything as long as there's a way to output it. Here's our template, python quine. All of these JavaScript quines run under node.

A quine program , or 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. How you do this varies from language to language depending on how variables are declared, the method of interpolation, the possible need for semicolons and newlines, the kinds of quotes required, and so on. Dealing with quotes is interesting; you need to find a way to specify that a quote character is to be printed without actually using a quote character.

Skip to content. Change Language. Open In App. Solve Coding Problems. Quine in Python. Improve Improve. Like Article Like. Save Article Save. Report issue Report. Quine is a program which takes no input but outputs a copy of its own code.

Python quine

Released: Jun 16, View statistics for this project via Libraries. This implementation of the Quine McCluskey algorithm has no inherent limits other than the calculation time on the size of the inputs. Also, in the limited tests of the author of this module, this implementation is considerably faster than other public Python implementations for non-trivial inputs. This slows down the algorithm, but in some cases the result can be much more compact than a sum of product. Jun 16, Jan 3,

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Report issue Report. Like Article Like. They make you think about levels of meaning—about values and their representations. This is very similar to our pseudocode example, except we use a function rather than a generic expression. Get an email when I write a new post! Similar Reads. Quine Programs Quines are cool. 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. Suggest changes. The gcc compiler will accept and run the program. Here is the translation of the classic version, using the positional specifier in printf. CGamesPlay 11 months ago prev next [—] A slightly more general formula works in any language that can manipulate strings, without leveraging the built-in escaping mechanism. These expression based quines can be run in a REPL.

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This transform allows us to represent additional things that dont appear in the original data string that we want to print. View More. It was interesting to see the author work through the major obstacles one by one when writing a quine. Unlike quines and multiquines, polyglot programs are not guaranteed to exist between arbitrary sets of languages as a result of Kleene's recursion theorem, because they rely on the interplay between the syntaxes, and not a provable property that one can always be embedded within another. A biquine could then be seen as a set of two programs, both of which are able to print either of the two, depending on the command line argument supplied. This is the classic. Create Improvement. APL has some cute quines. Wikimedia Commons. Asooka 11 months ago prev next [—]. Contribute to the GeeksforGeeks community and help create better learning resources for all. Releases No releases published. Similar to, but unlike a multiquine, a polyglot program is a computer program or script written in a valid form of multiple programming languages or file formats by combining their syntax. I want to share the general concepts used to construct programs like these and explore some of the things that can be done with them. But this isn't enough; we need to add quotes the first time we print the data, otherwise we get this output:.