Re: TypeError: iterable argument required

From	Blockheads Oi Oi <breamoreboy@yahoo.co.uk>
Subject	Re: TypeError: iterable argument required
Date	2011-04-06 17:12 +0100
References	<27163982-380f-4ddd-859e-adc069892c28@glegroupsg2000goo.googlegroups.com> <899d22f6-c936-4fe6-b824-4d064281ca54@o26g2000vby.googlegroups.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.77.1302106354.9059.python-list@python.org> (permalink)

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On 06/04/2011 16:57, Νικόλαος Κούρας wrote:
>>>> mail = None
>>>> mail = mail or 7
>>>> mail
> 7
>
>>>> mail = None
>>>> mail = 7 or mail
>>>> mail
> 7
>
> Here no matter the order iam writing the comparison it always return
> the number.
>
> why not the same here?
>
>>>> mail = None
>>>> mail = mail or ''
>>>> mail
> ''
>
>>>> mail = None
>>>> mail = '' or mail
>>>> mail
>>>>
>
> Why the or operator behaves differently with numbers than from
> strings?
>
> Please explain to me how it parses it with words.
>
> Thank you.

See this for an explanation of Python truth value testing.
http://docs.python.org/library/stdtypes.html

Cheers.

Mark L.

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Re: TypeError: iterable argument required "eryksun ()" <eryksun@gmail.com> - 2011-04-06 06:54 -0700
  Re: TypeError: iterable argument required Νικόλαος Κούρας <nikos.kouras@gmail.com> - 2011-04-06 08:41 -0700
  Re: TypeError: iterable argument required Νικόλαος Κούρας <nikos.kouras@gmail.com> - 2011-04-06 08:57 -0700
    Re: TypeError: iterable argument required Blockheads Oi Oi <breamoreboy@yahoo.co.uk> - 2011-04-06 17:12 +0100

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