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To: python-list@python.org
From: Sibylle Koczian <nulla.epistola@web.de>
Subject: Re: A certainl part of an if() structure never gets executed.
Date: Wed, 12 Jun 2013 21:48:19 +0200
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Xref: csiph.com comp.lang.python:47835

Am 12.06.2013 20:06, schrieb Νικόλαος Κούρας:
> Whn i see:
>
> if( x and y ):
> i understand: if x expression = True AND ALSO y expression = True then
> execute
>
>
> if( x or y ):
> i understand: if x expression = True OR y expression = True then execute
>
You didn't read MRABs explanation, did you?

> if '=' not in ( name and month and year ):
> i understand: if '=' not in name AND '=' not in month AND '=' not in year
>
Wrong. The "'=' not in (...)" first evaluates the expression in 
parentheses, that's what parentheses are for. And then it looks for '=' 
in the result. And that result is just one of the three values, MRAB 
told you which one.

>
> if '=' not in ( name or month or year ):
> i understand: if '=' not in name OR '=' not in month OR '=' not in year
>
Same here. You can't take the "'=' in" out of the parentheses, that 
leads to a wrong result.
>
> but i know it does not work like this, but tis is how i understand it.

??? If you know it doesn't work like this, then it won't help you to 
wilfully understand something you'd like to be true.

> its like reading an English sentence
>
No, this time it isn't.

HTH
Sibylle