[Casa-framework] builtin tools

[Raymond Rusk]

On Tue, 3 Apr 2007, Lindsey Davis wrote:

> Hi,
>
> I have a question about the persistence of the builtin tools. It is
> quite easy to do something like
>
> cb = None
>
> or
>
> x = 6
> cb = x
>
> in Python.
>
> What is the effect of overwriting a builtin tool. I know how to create
> my own instance of a tool and call it whatever I want to, but how do
> you expect your users to recover gracefully from this?

Maybe a convenience method to recreate tools should be added.  Something 
like 'newtool("cb", newvar)'.  It does nothing if the cb tool exists but 
recreates it if it doesn't and associates a new unique variable name with 
whatever value the user inadvently used cb to hold.

> How does doing this affect the tasks that depend on a calibrator tool.
> Do these task recreate a new if the builtin has been corrupted or is NOne or do
> they fail ?
>
>
>                                                                    Lindsey
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>

-- 
Dr. Raymond Rusk                                        Dr. Raymond Rusk
ALMA Software Engineer                           Ingenieur Logiciel ALMA
National Research Council Canada   Conseil national de recherches Canada
Herzberg Institute of Astrophysics   L'Institut Herzberg d'Astrophysique
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Raymond.Rusk at nrc-cnrc.gc.ca                  Raymond.Rusk at nrc-cnrc.gc.ca