• RapidCatLauncher ( RapidCatLauncher@lemmy.ca ) English
    61·
    1 year ago

    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!

      • wise_pancake ( wise_pancake@lemmy.ca ) 
        10·
        1 year ago

        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.

        • scott ( scott@lemmy.org ) English
          1·
          1 year ago

          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

          • brian ( brian@programming.dev ) 
            5·
            1 year ago

            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