On Jun 21, 4:54 pm, Gabriel Farrell <[EMAIL PROTECTED]> wrote:
> On Jun 19, 5:19 pm, RichardH <[EMAIL PROTECTED]> wrote:
>
>
>
> > This is probably more of a Python question than django, but django
> > provides the context for my problem.
>
> > Requirement: I have got a user defined list of field names (e.g.
> > field_names=['id','name','description',...]) and I want to pass this
> > list to the value() method on a QuerySet thereby returning a subset of
> > the model fields (as a dictionary).
>
> > Problem: value() takes individual field names as parameters (e.g.
> > value('id', 'name,' description'), not a list of field names (e.g.
> > value(field_names) ). Is there a simple way of passing the list of
> > field names to the value() method or is there an alternative strategy
> > for returning the subset of fields from the QuerySet?
>
> > Hopefully this is obvious to someone, but it has me stumped.
>
> > Richard
>
> Not obvious, and it's stumped me before in various Python projects, so
> I decided to search around for it. Finally found it
> athttp://mail.python.org/pipermail/python-list/2005-March/312568.html.
> That post says, in short, that one can pass a list of values to a
> function that expects those values as variable arguments by simply
> placing an asterisk before the list (or tuple) in the function input.
> For example:
>
> >>> def bob(*args):
> ... for arg in args:
> ... print arg
> ...
> >>> sally = ['june', 'andy', 'frank']
> >>> bob(sally)
> ['june', 'andy', 'frank']
> >>> bob(*sally)
> june
> andy
> frank
> >>>
>
> I tried so many ways around this problem, and I knew Python, by it's
> nature, had to have a simple solution. Glad to have found it.
>
> HTH,
> Gabe
Gabe,
This helps a great deal. Such a simple solution, I am surprised it
isn't more prominently documented. Many thanks for making the effort
to find it. Much appreciated.
Richard
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