Scala 3 and Python 3.8 (pre-release), 2 languages (385 bytes)

def String():Any=0
def Int():Any=0
def f(s:String):Any=print(s.replace(chr(81),chr(34)*3+s+chr(34)*3))
class M:
  f("""def String():Any=0
def Int():Any=0
def f(s:String):Any=print(s.replace(chr(81),chr(34)*3+s+chr(34)*3))
class M:
  f(Q)
def main(a:M):M=a
def chr(a:Int):String=""+a.toChar
@main
def q():M=M()""")
def main(a:M):M=a
def chr(a:Int):String=""+a.toChar
@main
def q():M=M()

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Try it online in Python!

def f(s:String):Any=print(s.replace(chr(81),chr(34)*3+s+chr(34)*3))

f is where everything happens. In Scala, the print method doesn't add a newline, but that doesn't matter to us. Both Scala and Python have a replace method on strings and can multiply strings by numbers, but they have different ways of turning integers into strings, which is why the chr method is defined later for Scala's benefit. It's already present in Python, but the interpreter sees it after f, and it's never run anyway. s is a string literal which contains basically the entire program, but the definition of s is replaced with Q. In f, this Q is replaced with """<contents of s>""" to mirror the definition of s, and that gets printed.

While Python can have expressions outside functions and classes, Scala needs a main method. Thus, the call to f is put inside a class M. Python runs this when the class loads, while Scala calls it in the method q, when the constructor is called using M(). However, to make the @main annotation to work with Python, a function named main was made.

chr is already defined in Python, and to make it work in Scala, the chr method converts an integer to a string based on its ASCII value.

Int and String are Scala builtins that we need to annotate the parameters to f and chr with, but Python doesn't know about them, which is why def String() and def Int() are defined. I made them functions instead of plain variables because Scala requires variables to be declared with val and var, something that is not possible in Python. While Scala sees def String as a method that takes nothing and can output Any value (specifically, 0), Python sees it as setting the value of a variable Any to 0. Neither of these two have any real impact on the code other than making it work nicely with Python.

posted over 3 years ago

CC BY-SA 4.0

3y ago by General Sebast1an‭

user‭

1556 reputation 9 59 175 89