A post about how this community’s banner used the python 2 print syntax - print "Hello World" - made me question, can we print a hello world message in Python 3 without using parentheses?

It turned out to be sort of a fun challenge, I’ve found 3 different approaches that work. I’d be interested to see what you come up with! (it seems I can’t put spoilers in Lemmy, so I won’t share my solutions yet in case y’all want to have a go).

Edit: Posted my solutions in the comments

    • qwop@programming.devOP
      7·
      1 年前

      Alright, here are my solutions :)

      1. Import Easter egg
      import __hello__

      Not the most technically interesting, but a fun Easter egg!

      1. Class decorators
      @print
@lambda _: "Hello World"
class Foo: 
    ...

      Decorators are another way of calling a function, so can be abused to solve this task. You need to decorate a class rather than a function though, since a function definition requires parentheses!

      1. Dunder methods
      class Printer:
    __class_getitem__ = print

Printer["Hello World"]

      There might be some other Dunder methods you can use to do this, although it’s sort of difficult since most (e.g. __add__) only describe behaviour on the instance of the class.

      1. More dunder methods
      from _sitebuiltins import Quitter
Quitter.__add__ = print
exit + "Hello World"

      Writing number 3 made me realise I just needed to find a class that already had an instance and change that. I’m sure there are many other cases of this, but here’s one!

      • McCheng@lemmy.fmhy.ml
        1·
        1 年前

        Very interesting solutions. I was in the direction of using dunder methods but could not figure out how. Haven’t heard of the __class_getitem__. The second solution is especially inspiring.