Is it ok to type check a boolean argument?

[Scott David Daniels]

James Stroud wrote:
> ...
> def find(field, order_by='desc'):
>   if order_by not in ['asc', 'desc']:
>     raise ValueError, 'Bad order_by parameter.'
>   ...
I'd try a little harder with that error message.
At least:
     raise ValueError('Bad order_by parameter %r.' % (order_by,))
if not:
     raise ValueError('Bad order_by = %r (should be in %r).' % ( 

                               order_by, ['asc', 'desc']))

--Scott David Daniels
Scott.Daniels at Acm.Org