Python quine

I wouldn't say this is the most boring.

This post is a few years old now, so some details or my opinions might be out of date.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.

Python quine

A quine is a program that provides its own source code as output. It's one of the first programs I'll try and write when learning a new language, but it wasn't always obvious to me how. At first these cute programs seemed like an almost impossible esoteric IOCCC -tier artform crafted by programming artisans. 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. We can access most of the source code already with this function by reading expr. This string data is actually used twice in the output string! Once at the start of the output, and again as part of the source of the expression. This reuse of information is a common trick when writing quines. JavaScript allows this kind of introspection for arbitrary functions by just converting them to strings:. This is very similar to our pseudocode example, except we use a function rather than a generic expression. More boilerplate is required to glimpse behind the curtain and grab the code, but it uses the exact same approach at the previous examples. While these quines are easy to make and understand, the functionality to achieve them isn't common to most programming languages they're also a bit dubious. When it's absent, we have to do something else. A more general approach we can use is to have some blob of data, and use it in the output twice; once to represent itself, and again to represent the rest of the code. Here is a template with no data.

At first these cute programs seemed like an almost impossible esoteric IOCCC -tier artform crafted by programming artisans.

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.

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, Dec 9, Download the file for your platform.

Python quine

Skip to content. Change Language. Open In App. Solve Coding Problems. Initialization of data members. Quine — A self-reproducing program. Improve Improve.

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Once at the start of the output, and again as part of the source of the expression. Branches Tags. Hidden categories: CS1 Russian-language sources ru Articles with short description Short description is different from Wikidata Articles with example C code. Note : In each of the following examples, the programs are assumed to have no newline at the end of the program text unless specified. Say, hex digits in Python;. Since such code does not construct itself, this is often considered cheating. CGamesPlay 11 months ago prev next [—]. Quine is a program which takes no input but outputs a copy of its own code. For amusement, programmers sometimes attempt to develop the shortest possible quine in any given programming language. We are still printing the data in two ways; to represent the collection of bytes, and to represent the code itself. You signed out in another tab or window. This is just a 'normal' eval-style quine - except it messages a channel instead of using console. This is about as simple as we can get; just some bytes, loops, and printing. Thank you for your valuable feedback! Python Convert list to Python array.

Hey everyone, this is an interesting tutorial about quine in Python.

For example, this Ruby quine:. This one is really close to cheating, because it uses eval. We dont have to worry about quote escapes as the base64 representation will not contain any. Archived from the original on 23 April Since such code does not construct itself, this is often considered cheating. Go to file. Of necessity, such quines are much more convoluted than ordinary quines, as is seen by the following example in Ruby : [19]. So the best thing to do is make use of the positional argument specifier:. Read Edit View history. This is about as simple as we can get; just some bytes, loops, and printing. There actually is another really cool way to get the quotes in Perl: you can use q for quoting. No reason to stop at print "print " , you can nest further, print 'print "print " '. JavaScript allows this kind of introspection for arbitrary functions by just converting them to strings:.