Driver selection

[Gabriel Genellina]

At Saturday 9/12/2006 13:15, Stuart D. Gathman wrote:

>app.py:
>
>import spf
>spf.set_driver('dnspython')
>...
>
>Can a function replace itself?  For instance, in spf.py, could DNSLookup
>do this to provide a default:
>
>def set_driver(d):
>   if d == 'pydns':
>     from pydns_driver import DNSLookup
>   elif d == 'dnspython':
>     from dnspython_driver import DNSLookup
>   else: raise Exception('Unknown DNS driver')
>
>def DNSLookup(name,t):
>   from pydns_driver import DNSLookup
>   return DNSLookup(name,t)

The above code *almost* works, but DNSLookup is a local name inside 
the function. Use the global statement.
As an example, see how getpass.py (in the standard library) manages 
the various getpass implementations.


-- 
Gabriel Genellina
Softlab SRL 

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