On 16 Jul 2005 02:31:28 -0700, "Raymond Hettinger" <[EMAIL PROTECTED]> wrote:
>[Bengt Richter]
>> how about (untested)
>>
>> def get_options(opts):
>> """Return True or False if an option is set or not"""
>> return [1 for val in vars(opts).values() if val is not None] and True
>> or False
>
>While we're tossing around hacks and coding atrocities, we should note
>that:
>
> not not x
>
>outperforms:
>
> x and True or False
>
>neither of which is as clear as:
>
> bool(x)
>
Point. ;-)
(I actually thought to do not not x and bool(x) also crossed my mind, so
I'm not sure why I wound up with the above).
BTW, I imagine this is probably faster (and closer to the OP's approach),
at least for large option sets: (maybe needs comment like # not all None's ? ;-)
>>> def get_options(opt):
... values = vars(opt).values()
... return values.count(None) != len(values)
...
>>> opt = type('',(),{})()
>>> get_options(opt)
False
>>> opt.a=None
>>> get_options(opt)
False
>>> opt.b=None
>>> get_options(opt)
False
>>> opt.c = 'option c'
>>> get_options(opt)
True
>>> vars(opt)
{'a': None, 'c': 'option c', 'b': None}
Regards,
Bengt Richter
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