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From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: re.search when used within an if/else fails
Date: Wed, 28 Nov 2012 19:20:35 -0500
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Xref: csiph.com comp.lang.python:34044

On 28 Nov 2012 21:39:03 GMT, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> declaimed the following in
gmane.comp.python.general:

> On Wed, 28 Nov 2012 14:08:15 -0600, Evan Driscoll wrote:
> 
> > to go test it, I think that if you, say, indent from the first to the
> > second level with tabs (consistently), indent from the second to third
> > level with spaces (consistently), and indent from the third to fourth
> > level with tabs (consistently), it should not complain. 
> 
> Correct, which disappoints me. Testing with Python 3:
> 
> py> if True:
> ...     if True: # tab
> ...         pass  # tab, then four spaces
> ...
> py>
> 
> I would prefer that the "pass" line would fail with an illegal indent, 
> but it does not. But at least the following fails cleanly:
> 
> 
> py> if True:
> ...     if True: # tab
> ...         pass  # tab, then four spaces
> ...         pass  # two spaces, tab, four spaces
>   File "<stdin>", line 4
>     pass  # two spaces, tab, four spaces
>                                        ^
> TabError: inconsistent use of tabs and spaces in indentation
>

	Unless there has been a major change in the parser... (I still don't
have Python 3.x installed)

	I believe <tab> is expanded to 8-spaces -- NOT TO NEXT MULTIPLE OF
8...

	So the first is 8+4 => 12 spaces, the second is 2+8+4 => 14 spaces.

	Does 2 + <tab> + 2 vs 4 + <tab> vs <tab> + 4 succeed? That would
confirm the treatment. 

	The main concern with mixed tab and spaces, as I recall, was due to
having /editors/ and /terminals/ configured to show <tab> as a four
space (or anything other than an eight space) increment; so visually
four spaces and one <tab> might look the same... One user might have the
editor showing 4-space indents on <tab> but entering text using 4 spaces
on input -- which now is mis-aligned if the source file HAD <tab> in it.
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/