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Python: object as an argument of another object

Answer 1

+1 A:

Create an instance of a Driver object and pass it to the Car's constructor.

e.g.,

>>> d = Driver()
>>> c = Car(d)

or just

>>> c = Car(Driver())

[edit]

So you're trying to use an instance of a driver as you define a class? I'm still not sure I understand what it is you're trying to do but it sounds like some kind of decorator perhaps.

def OwnedCar(driver):
    class Car(object):
        owner = driver
        #...
    return Car

steve = Driver()
SteveCar = OwnedCar(steve)

Jeff M 2010-08-11 08:37:50

My question was a bit unclear, what I mean is how to handle object argument in the class definition: class Car: def __init__(self, driverA) driverA.foo() driverA.bar()Does this work, or do I have to define the type of Driver in the class definitions?

rize 2010-08-11 09:21:32

@rize In python you try it and see if it works. to answer your question, no you do not need to define the type of the argument `DriverA`. If `DriverA.foo` and `DriverA.bar` exist, then there will be no error. You could pass it a `Pilot` as long as `Pilot.foo` and `Pilot.bar` exist and do what you want.

aaronasterling 2010-08-11 10:51:47

Answer 2

A:

Update: The OP is trying to pass an object instance at class definition time (or so I think after seeing his comment). The answer below is not applicable.

Is this what you are trying to achieve?

class Car:
    def __init__(self, driver):
        self.driver = driver

class Driver:
    pass

driver = Driver()
car = Car(driver)

Manoj Govindan 2010-08-11 08:38:57

Yes, that's exactly what I'm trying to do: pass an object instance at class definition time

rize 2010-08-11 09:38:27

Ah. Can you tell me how you are using that object instance in the class definition? Your comment above seems to use it in the class *constructor*, which doesn't make much sense. Posting some code would help.

Manoj Govindan 2010-08-11 10:17:44

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Python: object as an argument of another object

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