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Re: Context-aware return

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Steven D'Aprano <steve@pearwood.info> writes:

> I have a function which is intended for use at the interactive
> interpreter, but may sometimes be used non-interactively. I wish to
> change it's output depending on the context of how it is being called.
> […]
>
> x = func()
> assert x == 999
>
> L = [1, 2, func(), 4]
> assert L[2] == 999
>
> func()
> # interactive interpreter prints "Awesome"
>
> Is such a thing possible, and if so, how would I do it?

That makes my skin creep. In the name of all the tea I've sacrificed to
Python over the years, I pray this isn't possible.

> If I did this thing, would people follow me down the street booing and
> jeering and throwing things at me?

First thing in the morning I will purchase a head of cabbage and store
it in a warm place to make it rot, on the off chance you find some
obscure way to achieve your benighted goal, just so I can be first in
line to throw it as you pass.

If ever I have to worry that some arbitrary Python function, unbenownst
to me, might have a branch that will make it behave differently
depending on *whether I bind a reference to its return value*, then I'll
know you are sent to us as an evil spirit to make all software suck.

-- 
 \       “Nothing exists except atoms and empty space; everything else |
  `\                                          is opinion.” —Democritus |
_o__)                                                                  |
Ben Finney

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Thread

Context-aware return Steven D'Aprano <steve@pearwood.info> - 2015-09-11 03:54 +1000
  Re: Context-aware return "Sven R. Kunze" <srkunze@mail.de> - 2015-09-10 20:03 +0200
  Re: Context-aware return Ben Finney <ben+python@benfinney.id.au> - 2015-09-11 04:12 +1000
  Re: Context-aware return Ben Finney <ben+python@benfinney.id.au> - 2015-09-11 04:14 +1000
  Re: Context-aware return "Sven R. Kunze" <srkunze@mail.de> - 2015-09-10 20:21 +0200
  Re: Context-aware return "Sven R. Kunze" <srkunze@mail.de> - 2015-09-10 20:24 +0200
  Re: Context-aware return "Sven R. Kunze" <srkunze@mail.de> - 2015-09-10 20:34 +0200
  Re: Context-aware return Chris Angelico <rosuav@gmail.com> - 2015-09-11 04:39 +1000
  Re: Context-aware return Laura Creighton <lac@openend.se> - 2015-09-10 20:40 +0200
  Re: Context-aware return "Sven R. Kunze" <srkunze@mail.de> - 2015-09-10 20:45 +0200
  Re: Context-aware return "Sven R. Kunze" <srkunze@mail.de> - 2015-09-10 20:56 +0200
  Re: Context-aware return Paul Rubin <no.email@nospam.invalid> - 2015-09-10 12:19 -0700
  Re: Context-aware return Grant Edwards <invalid@invalid.invalid> - 2015-09-10 19:23 +0000
    Re: Context-aware return Akira Li <4kir4.1i@gmail.com> - 2015-09-10 23:15 +0300
      Re: Context-aware return Grant Edwards <invalid@invalid.invalid> - 2015-09-10 20:27 +0000
    Re: Context-aware return random832@fastmail.us - 2015-09-10 16:42 -0400
    Re: Context-aware return Rustom Mody <rustompmody@gmail.com> - 2015-09-11 08:55 -0700
    Re: Context-aware return Rustom Mody <rustompmody@gmail.com> - 2015-09-11 08:55 -0700
  Re: Context-aware return Denis McMahon <denismfmcmahon@gmail.com> - 2015-09-11 00:41 +0000
    Re: Context-aware return Ned Batchelder <ned@nedbatchelder.com> - 2015-09-12 16:27 -0700
      Re: Context-aware return Steven D'Aprano <steve@pearwood.info> - 2015-09-17 12:31 +1000
  Re: Context-aware return Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-09-12 03:11 +0100

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