Spyke
lemmy.ca

That just gave me the idea that it would be fun to inspect exit a little.

Which led me down this path:

>>> repr(exit)
'Use exit() or Ctrl-Z plus Return to exit'
>>> dir(exit)
[(...), 'eof', 'name']
>>> exit.eof, exit.name
('Ctrl-Z plus Return', 'exit')

Okay, cool, the "Use exit() etc." blurb appears because it's the function's repr, and the string is assembled from its name and eof properties.

Now let's try to make our own:

>>> exit.__class__
<class '_sitebuiltins.Quitter'>
>>> gtfo = exit.__class__()
TypeError: Quitter.__init__() missing 2 required positional arguments: 'name' and 'eof'

Oh Python, you shouldn't have.

>>> gtfo = exit.__class__("a big puff of smoke", "a sneaky skedaddle")
>>> gtfo
Use a big puff of smoke() or a sneaky skedaddle to exit

Beauty!

103
dormedasreply
lemmy.dormedas.com

FINALLY! This has always annoyed me. If you’re gonna go through all the trouble of identifying that I want to exit, just DO it.

43
lemmy.ca

It’s not really much extra effort though

They just added so e text to the __repr__ method on the exit callable object

That’s much easier than figuring out if your running this interactively and trying to figure out if this is going to break stuff.

18
scottreply
lemmy.org

Lemme golf that

~ $ python
Python 3.12.10 (main, Apr  9 2025, 18:13:11) [Clang 18.0.3 (https://android.googlesource.com/toolchain/llvm-project d8003a456 on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> class x:
...  def __repr__(s):
...   exit(0)
...
>>> xit = x()
>>> xit
~ $

Not that hard

0
brianreply
programming.dev

repr is generally assumed to be side effect free and cheap to run, so things like debuggers tend to show repr of things in scope, including possibly exit

also then it behaves differently between repl and script, since repr never gets run. to do it properly it has to be a new repl keyword I imagine, but I still don't know if I'm sold on the idea

5

Good points. You're right, it does need solved at the shell level. Glad they did so.

3

The dev thought "I know exactly what you meant, but I still insist you to do it my way".

55
dubvee.org

I can actually forgive that one since it's the fallback for any invalid argument.

17
lemmings.world

Not always, way too often you just get a variation of "invalid option, use --help to get a list of options"

How about you show me by default like most apps?

3
lemmy.world

They meant that you'd get the same message no matter what unrecognized option you use. So it's not like they added a specific check that if you type in -h they will give you the message, but instead you get the same message for any unrecognized option.

The thing in the OP only occurs if you type exit, so they specifically added that message to be shown when the interpreter clearly knows what you want, but you just didn't say it exactly right.

3
lemmings.world

I mean, if I didn't use a correct flag, my next command will probably include -h / --help

1

You aren't wrong, it wouldn't be bad for it to just print the help in that case, at least when running interactive.

For automation, printing the full help of a more complex command would completely trash logs.

1

Or more subtly, when the command uses BSD (nowadays Go) style single-dash args, so it wants -help and not --help.

3
lemmy.world

I have a vivid memory when I was in first grade and asked my teacher if I can use the bathroom, and I got his bullshit response. I was a first grader, so I sat my ass back down and held it. Fuck this horse shit mentality.

Fine, if you're an adult, it's juvenile, but at that point people should understand the difference. Doesn't mean I won't lambast a MFer for being a pedantic prick though.

15

As an adult I'm asking nobody if I "may" use the bathroom. I might ask, "can I use YOUR bathroom" (notably not "may") or say "can you point me to the bathroom" because I am a human being with a right to access these facilities (Americans need not apply).

Teachers who feel the need to get one over on a child are pieces of shit. It teaches nobody anything except "adults are awful". Be nice to kids, you can fuck them up with something you don't think twice about.

10

Too many to count, but I learned this lesson. I just struggled with nuance in gramer as a fucking 1st grader.

2

People seriously don't use ^D to exit REPLs and shells? So much faster.

6

You reached the end

exit | Spyke