Earlier quoted context omitted.
Perl's binary brings with it the ability to run every release of the language, from 5.8 onwards. You can mix and match Perl 5.30 code with 5.8 code with 5.20 code, whatever, just say "use v5.20.0;" at the start of each module or script. By comparison, Python can barely go one version without both introducing new things and removing old things from the language, so anything written in Python is only safe for a a fragi…
> By comparison, Python can barely go one version without both introducing new things and removing old things from the language Overwhelmingly, what gets removed is from the standard library, and it's extremely old stuff. As recently as 3.11 you could use `distutils` (the predecessor to Setuptools). And in 3.12 you could still use `pipes` (a predecessor to `subprocess` that nobody ever talked about even when `subproc…
That is not what I was getting at. What I was saying is that, if you write code for perl 5.20 and mark it "use 5.20.0;", then that's it, you're done, code never needs to change again. You can bring in newer perl interpreters, you can upgrade, it's almost certainly not going to break.
You can even write new code down the line in Perl 5.32 which wouldn't be possible in 5.20, and the 5.20 code wouldn't be valid in 5.32, but as they're both declaring which version of the language they're written in, they just seamlessly work together in the same interpreter.
Compared to Python's deliberate policy, which is they won't guarantee your code will still run after two minor releases, and they have a habit of actively removing things, and there's only one version the interpreter implements and all code in the same interpreter has to be be compatible with that version... it means a continual stream of having to update code just so it still runs. And you don't know what they're going to deprecate or remove until they do it, so it's not possible to write anything futureproof.
> in 2.7, surrounding parentheses are not redundant,
That is interesting, I wasn't aware of that. And indeed that would be a thorny problem, moreso than keeping a print statement in the grammar.
Fun fact: the parentheses for all function calls are redundant in perl. It also flattens plain arrays and does not have some mad tuple-list distinction. These are all the same call to the foo subroutine:
foo "bar", "baz"
foo ("bar", "baz")
foo (("bar", "baz"))
foo (("bar"), "baz")
foo (((("bar")), "baz"))