[docs] [issue10021] Format parser is too permissive

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

On Mon, Oct 4, 2010 at 1:02 PM, Eric Smith <report at bugs.python.org> wrote:
..
> Ah, but I don't need to in order to comply with the PEP!

This is true and this is the reason I changed this issue from bug to
doc.   I seem to remember this having been discussed before, but I
cannot find the right thread.   There are at least two reasons cpython
docs should mention this:

1. From current documentation, users are likely to expect a value
error from format(".$#@", ..) rather than an attribute error.
2. Naive proxy objects may implement __getattribute__ that blindly
inserts attribute name into database queries leading to all kinds of
undesired behaviors.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10021>
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