calling python functions using variables

[Grant Edwards]

On 2006-05-19, bruno at modulix <onurb at xiludom.gro> wrote:

>> Either deal with the resulting NameError exception (EAFP[0])
>
> try:
>   getattr(commands, VARIABLE)()
> except NameError:
>   print >> sys.stderr, "Unknown command", VARIABLE
>
>> or test
>> first whether the attribute exists (LBYL[1]).
>
> command = getattr(commands, VARIABLE, None)
> if command is None:
>   print >> sys.stderr, "Unknown command", VARIABLE
> else:
>   command()
>
> I'd go for the first solution.

Me too.  Assuming the user isn't clueless, the normal case is
where the command exists.  Write code for the normal case and
use the exception that occurs for exceptional cases.

-- 
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