Re: Passing a list of field names to the value() method?

[Gabriel Farrell]

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 at
http://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


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