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Re: decorator to fetch arguments from global objects

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  Re: decorator to fetch arguments from global objects Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de> - 2013-06-19 08:03 +0000

#48696 — Re: decorator to fetch arguments from global objects

Wolfgang Maier <wolfgang.maier <at> biologie.uni-freiburg.de> writes:

> 
> andrea crotti <andrea.crotti.0 <at> gmail.com> writes:
>  
> > 2013/6/18 Terry Reedy <tjreedy <at> udel.edu>
> > 
> > Decorators are only worthwhile if used repeatedly. What you specified can
> easily be written, for instance, as
> > def save_doc(db=None):
> >   if db is None:
> >     db = fetch_from_global()
> >   if isinstance(db, dbclass):
> >     save_it()
> >   else:
> >     raise ValueError('need dbobject')  

Another suggestion, without knowing too much about your code's architecture:
why not *initialize* your Entity instance with a db_out attribute, so you do
Terry's db checking only in one central place - Entity's __init__ method?
Wolfgang

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