This is a joke that's actually built into Python. The __future__ module is where you can import/enable features that will become the default in future versions. The point it makes by giving "SyntaxError: Not a chance" is that Python will never add braces.

And IMO for good reason. It makes the code so much cleaner and it's not like it particularly takes effort to indent your code correctly, especially since any moderately competent editor will basically do it for you. Tbh I actually find it much less effort than typing braces.