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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Wed, 9 Nov 2011 19:10:27 -0700
Subject: Re: all() is slow?
To: Devin Jeanpierre <jeanpierreda@gmail.com>
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Cc: python-list@python.org, Steven D'Aprano <steve+comp.lang.python@pearwood.info>
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:15523

On Wed, Nov 9, 2011 at 6:26 PM, Devin Jeanpierre <jeanpierreda@gmail.com> wrote:
> The use of exec also results in (seemingly) arbitrary constraints on
> the input. Like, why can't "--" be a name? Because exec? Is there some
> other reason?

That's by design, not because of exec.  The names are supposed to be
actual Python names, things that can used to designate keyword
arguments ("MyTuple(foo=42)") or to retrieve elements using attribute
lookup ("my_tuple.foo").  Using "--" as a name would be a syntax error
in either of those cases.

Cheers,
Ian