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From: Chris Angelico <rosuav@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: Why not allow empty code blocks?
Date: Sat, 30 Jul 2016 22:44:58 +1000
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Xref: csiph.com comp.lang.python:112063

On Sat, Jul 30, 2016 at 10:31 PM, Rustom Mody <rustompmody@gmail.com> wrote=
:
> What makes you think I wanted to print those numbers??
> Maybe I wanted a list of 10 None-s??

Because you NEVER SAID what you wanted! How can you talk about error
detection if you won't say what the programmer's intention was? You're
forcing us to guess, and then complaining that I guessed wrongly.

> Point being that when one mixes up 2 things like that its anybody=E2=80=
=99s guess
> which is the primary (central) effect and which the =E2=80=98side=E2=80=
=99 effect

Okay, so my revised guess is: Console output is a primary effect and
should not have a secondary effect of returning None. Great. Now
please go and build yourself a language in which list.append is a
statement (because it shouldn't return None either), etc, etc, just in
case someone uses them wrongly. I'll keep using Python, where it's
normal for a side-effect-y function to return None - it's much
simpler. And even in Pike, where void functions are a real thing, it's
possible to recast the function so you can call it in an expression
context - and the same thing happens. Truly void functions are nothing
but parser convenience.

ChrisA