Exec Statement Question

[Victor Subervi]

On Mon, Nov 30, 2009 at 12:25 PM, Carsten Haese <carsten.haese at gmail.com>wrote:

> Victor Subervi wrote:
> > Taking out the parenthesis did it! Thanks. Now, you state this is an
> > option of last resort. Although this does indeed achieve my desired aim,
> > here is a complete example of what I am trying to achieve. The following
> > is from 'createTables2.py':
> >
> >   for table in tables:
> >     try:
> >       exec 'from options import %s' % table
> >     except:
> >       pass
> >     try:
> >       exec '%s()' % table
> >     except:
> >       pass
>
> Here's a rough sketch of rewriting that snippet in a way that uses
> attribute lookup instead of dynamic code execution:
>
> #---------------------------------------#
> import options
> for table in tables:
>    tablefunc = getattr(options, table)
>    tablefunc()
> #---------------------------------------#
>
> The main ideas behind this approach are:
>
> 1) Rather than importing the functions from the options module piecemeal
> into the local namespace, I just import the entire options module as its
> own separate namespace.
>
> 2) I use getattr on that separate namespace to look up the desired
> function object from the options module. I assign the local name
> <<tablefunc>> to the resulting function object.
>
> 3) I call that function using the local name <<tablefunc>>.
>
>
Thanks. This is good. Thanks Jean-Michelle for the suggestion on better
naming. Thanks Marco for the lxml builder, but I'm happy with just plain old
html.
V
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