Ilias Lazaridis wrote:
> I have some python code which looks similar to this:
>
> class Car(BaseClass) :
> manufacturer = factory.string()
> model = factory.string()
> modelYear = factory.integer()
>
> def __str__(self):
> return '%s %s %s' % (self.modelYear, self.manufacturer,
> self.model)
>
> def factory.string(self)
> s = String() # creates a string object
> #... # does several things
> return s # returns the string object
>
> -
>
> I would like to simplify it in this way:
>
> class Car(BaseClass):
> manufacturer = factory.string(2) # 2 = position number...
> model = factory.string(3) # ...withinn __str__
> modelYear = factory.integer(1)
>
> def factory.string(self, position)
> s = String() # creates a string object
> ... # does several things
>
# creates somehow the __str__ functionality...
>
> return s # returns the string object
>
> -
>
> How could I achieve this?
>
> .
>
I'm slightly confused about your use of factory functions for making
instance variables (perhaps you could explain that?). Without knowing
more about that, here's a mixin solution I've used in the past (note
that __strdef__ is something I just made up):
class SmartStr(object):
def __str__(self):
return "<%s %s>" % (self.__class__.__name__,
", ".join(attrname + "=" + str(getattr(self, attrname))
for attrname in self.__strdef__))
class Car(SmartStr):
__strdef__ = ["model_year", "manufacturer", "model"]
def __init__(self, manufacturer, model, model_year):
self.manufacturer = manufacturer
self.model = model
self.model_year = model_year
c = Car("Toyota", "Camry", 1990)
print c # => <Car model_year=1990, manufacturer=Toyota, model=Camry>
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