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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Fri, 5 Dec 2014 11:30:43 -0700
Subject: Re: Tabs for indentation & Spaces for alignment in Python 3?
To: Python <python-list@python.org>
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On Fri, Dec 5, 2014 at 10:40 AM, Aahan Krish <krish@aahan.me> wrote:
> Q2. PEP 8 also reads, "Python 3 disallows mixing the use of tabs and
spaces for indentation."
>
> So, if I am using tabs for indentation and spaces for alignment, is it
still considered "mixing the use of tabs and spaces" in Python 3? (Please
see this example.)

No, you can mix tabs and spaces as long as you do so consistently within a
block, i.e. if one line is indented with <tab><sp><sp><tab> then the next
line in the same block had better start with that same exact sequence. The
difference is that Python 2 when trying to compare indentation will treat a
tab as equal to 8 spaces (or was it 4?) which can lead to situations where
the relative indentation of two lines looks one way to the programmer but
is lexed a different way by the interpreter. Python 3 resists the
temptation to guess in this situation and simply raises an error.

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<div dir=3D"ltr">On Fri, Dec 5, 2014 at 10:40 AM, Aahan Krish &lt;<a href=
=3D"mailto:krish@aahan.me">krish@aahan.me</a>&gt; wrote:<br><div>&gt; Q2. P=
EP 8 also reads, &quot;Python 3 disallows mixing the use of tabs and spaces=
 for indentation.&quot;<br></div><div>&gt;<br>&gt; So, if I am using tabs f=
or indentation and spaces for alignment, is it still considered &quot;mixin=
g the use of tabs and spaces&quot; in Python 3? (Please see this example.)<=
br><br></div><div>No, you can mix tabs and spaces as long as you do so cons=
istently within a block, i.e. if one line is indented with &lt;tab&gt;&lt;s=
p&gt;&lt;sp&gt;&lt;tab&gt; then the next line in the same block had better =
start with that same exact sequence. The difference is that Python 2 when t=
rying to compare indentation will treat a tab as equal to 8 spaces (or was =
it 4?) which can lead to situations where the relative indentation of two l=
ines looks one way to the programmer but is lexed a different way by the in=
terpreter. Python 3 resists the temptation to guess in this situation and s=
imply raises an error.</div></div>

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