Gerardo Herzig wrote:
> I want the collect_validators() method is to execute any of the
> above methods, and collect their names as items of a list (wich
> will be the collect_validators() return value).
(inside class definition -- untested)
validators = {"is a number": is_really_a_number,
"is even": is_even,
"is greater than zero": is_greater_than_zero}
def collect_validators(self):
return [desc for desc, func in self.validators.items() if func()]
> My first approach is:
... no method, but a generator. Executing it will give you a
generator object instead of a result list.
> [code]
> def collect_validators(self):
> v_dict = { 'is_really_a_number': is_really_a_number,
> 'is_even': is_even,
> 'is_greater_than_zero', is_greater_than_zero
> }
>
> for name, meth in v_dict.items():
> result = meth()
> if result: yield name
> [/code]
>
> I wondering if is this a good pattern to apply, i like the way it
> looks like, at least to me it looks `natural',
IMHO, it doesn't look natural. It depends on what you want to
achieve. This generator will need to be iterated over until it
is "exhausted".
> but...im calling every method twice here?
No. Methods are only called if you apply the function call
operator, "()".
BTW, I hope you don't really want to test a number to be greater
than zero, or even, by using an own method, respectively, just to
test this.
Regards,
Björn
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