Jason OrendorffMar 16
SnoopJ
This is your periodic reminder that `0xfor....real` is a syntactically-valid AND error-free #Python program
Mar 16 at 4:24amWeb
Show threadSnoopJMar 16
All currently-supported versions of Python optimize this program to an integer constant
Show threadAlyssa CoghlanMar 16
@SnoopJ I was trying to work out how it avoided the attribute error, and then realised that entire subexpression was being skipped due to the short circuiting
Show threadWattana's Place of BrainrotMar 16
@SnoopJ how does that get past the parser? And how does it work?
Show threadSnoopJMar 16
@Atirut it lexes the same as: `0xf or ....real` and the first part of the boolean OR is truthy, so short-circuit returns 15 without ever evaluating the RHS which would lead to an `AttributeError` if evaluated
Show threadWattana's Place of BrainrotMar 16
@SnoopJ ahhhh, I think that's what happens when the lexing logic is "consume until no hex characters" and not "consume until no hex characters AND check if it's a proper token boundary".
Show threadSnoopJMar 16
@Atirut yep. Modern versions of the runtime emit a SyntaxWarning for this kind of implicit boundary, perhaps it will become an error in the future
Show threadsabikMar 16

@SnoopJ @Atirut
`0xf or ....real` surely?

the first three dots are Ellipsis, so it's equivalent to `0xf or Ellipsis.real`

Show threadSnoopJMar 16
@sabik @Atirut oops, yes, I transposed those, thanks for the correction
Show threadMark DunneMar 16
@SnoopJ twenty years ago this would absolutely have become my screen name in something. I’m fighting the urge right now.
Show threadBaptiste MispelonMar 16

@SnoopJ Ha, nice one!

You can also turn it into a function `0xfor` which accepts an arbitrary number of positional arguments (including 0, but no keyword arguments), and always return 15.

```
>>> 0xfor(123, "asdf", {})
15
```

Show threadd@nny disc@ mc²Mar 16
@SnoopJ "bruh" feels like the appropriate response to this
Show threadrj6d ago
@SnoopJ The 0xf0rd Real
Show threadResuna6d ago

@SnoopJ

% python3
Python 3.11.0 (v3.11.0:deaf509e8f, Oct 24 2022, 14:43:23) [Clang 13.0.0 (clang-1300.0.29.30)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 0xfor....real
<stdin>:1: SyntaxWarning: invalid hexadecimal literal
15

So... sort of the Python equivalent of DO10I=1.10 except not?