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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: Extension of while syntax
Date: Fri, 12 Dec 2014 11:38:19 -0500
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On Thu, 11 Dec 2014 18:21:46 -0800 (PST), Nelson Crosby <nc@sourcecomb.com>
declaimed the following:

>I was thinking a bit about the following pattern:
>
>value = get_some_value()
>while value in undesired_values:
>    value = get_some_value()
>
>I've always hated code that looks like this. Partly due to the repetition, but partly also due to the fact that without being able to immediately recognise this pattern, it isn't very readable.
>

	So what's wrong with

while True:
	value = get_some_value()
	if value not in undesired_values: break

Closest match to Ada

loop
	value := get_some_value;
	exit when value not in undesired_values;
end loop;

(the "not in" may need to be a function receiving value and returning a
boolean, if value can be some arbitrary item -- Ada normally only allows
"in" for a range, not a list/array; though 2012 allows v1|v2|v...|vx )
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/