This project has always fascinated me, so I tried making a tiny uroboros quine with Python -> Javascript -> Python -> etc. I started with a quine for each langu

This project has always fascinated me, so I tried making a tiny uroboros quine with Python -> Javascript -> Python -> etc. I started with a quine for each language, and tried inserting them into each other, but the output always grew exponentially. py_quine_template = "s = {}; print(s.format(repr(s)))" py_quine = py_quine_template.format(repr(py_quine_template)) js_quine_template = "s = {}; console.log(s.replace('{}', JSON.stringify(s)))" js_quine = js_quine_template.format(repr(js_quine_template)) py_js_quine = py_quine_template.format(repr(js_quine_template)) ??? So I checked how it's done in the Github repo[1], but the language snippets only seemed to be quoting and printing without any self-references like you'd expect in a quine... Then it hit me. You only need the quine machinery in one language. If I can make a Python script that has a string with its own source code, then the Javascript code will simply be `console.log(py_source)`, no manipulation necessary. So here's my Python/Javascript uroboros quine: s = "s = {}\npy_source = s.format(repr(s))\nprint('console.log('+repr(py_source)+')')" py_source = s.format(repr(s)) print('console.log('+repr(py_source)+')') If there were more languages, then it'd be `console.log("System.out.println({python_source})")`, etc. The problem then becomes escaping inner quotes, and escaping the escape characters themselves. I managed to sidestep the issue by using two types of quotes, and relying on Python's `repr` also giving valid JS strings, but if I had to add just one more language I'd need a lot more scaffolding. I still think the Quine Relay is a tour de force, but now for different reasons. It's not 128 quines in different languages, but an incredibly robust system for escaping strings in 128 wildly different languages. [1] https://github.com/mame/quine-relay/blob/master/src/code-gen.rb https://github.com/mame/quine-relay/blob/master/src/code-gen...