[Python-Dev] a quit that actually quits

[Fredrik Lundh]

Jeremy Kloth wrote:

> Ka-Ping Yee wrote:
> > I'd be happy with having Python exit when the user types just plain
> > 'exit' without parentheses, but only in that case, not others.
> > However, i'm starting to think that may be impossible to implement.
> > I can't think of any way to make 'print exit' not exit, for example.
>
> OK, here's one:
>
> def quithook(obj, _exit=__builtins__.exit, _displayhook=sys.displayhook):
>     if obj is _exit: raise SystemExit
>     _displayhook(obj)
> sys.displayhook = quithook
>
> It does, however, fall into the whole issue of chaining that Skip brought up
> earlier.

as well as various introspection-related issues:

    >>> import foo
    >>> cb = foo.getcallback()
    >>> # let's see what it is
    >>> cb

    $

(by the way, it's "__builtin__", not "__builtins__".  the former is a module,
the latter a CPython implementation detail)

</F>