Slightly off topic: This thread is another good reason to support
zero=None by default, discussing here: 
https://groups.google.com/group/web2py/msg/4e6fc1b12714a14b

:)

On Feb7, 12:06pm, Jonathan Lundell <jlund...@pobox.com> wrote:
> On Feb 6, 2010, at 7:53 PM, weheh wrote:
>
> > In a crud form (or other form) where I have a field declared as a
> > string that requires=IS_IN_SET(['A','B','C']), the first item in the
> > automatically-generated pull-down for that enumerated field is a
> > blank.
>
> > Why is that, if there is no blank in my set, and especially, since a
> > blank setting on that field will fail validation? How to get rid of
> > the first blank entry?
>
> Try specifying zero=None in the validator.

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