在 Python 中将 arguments 传递给 function

Question

In a simplified example, say I have

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

def change_wheels(car, wheel_type):
  ...
def repair_brakes(car, brake_pads, brake_fluid):
  ...

car_list = [Car(change_wheels), Car(repair_brakes)]

def service_car(car, wheel_type, brake_pads, brake_fluid):
  car.operation(???)

How do I pass the required arguments to the operation function?

Answer 1

You could give Car parameters, like wheel type, brake type, etc. And pass the car object to the functions, then retrieve the car's parameters. These attributes is corresponding to each car, because they have different brake types etc... And passing these objects to the functions makes easier to get the needed parameters later.

class Car:
    def __init__(self, wheel, brakes, operation):
        self.wheel     = wheel
        self.brakes    = brakes
        self.operation = operation

def change_wheels(car):
    print('Wheel', car.wheels)

def repair_brakes(car):
    print('Brakes', car.brakes)

car_list = [Car('Wheel type', 'Brake type', change_wheels), Car('Wheel type', 'Brake type', repair_brakes)]

for car in car_list:
    car.operation(car)

Not all parameters were implemented, this is just an example!

Answer 2

Not sure what you want, but how about:

class Car:
  def __init__(self, operation):
    self.op = operation
  
  def __call__(self, *args, **kwargs):
    try: self.op(self, *args, **kwargs)
    except TypeError: print('Unsupported operation.')

def change_wheels(car, wheel_type):
  print('change_wheels()', wheel_type)

def repair_brakes(car, brake_pads, brake_fluid):
  print('repair_brakes()', brake_pads, brake_fluid)

car_list = [Car(change_wheels), Car(repair_brakes)]

def service_car(car, wheel_type, brake_pads, brake_fluid):
  #car.operation(???)
  car(wheel_type)
  car(brake_pads, brake_fluid)

for car in car_list: service_car(car, 'wt', 'bp', 'bf')