How to call Base Class's __init__ method from the child class? [duplicate]
If I have a python class as:
class BaseClass(object):
#code and the init function of the base class
And then I define a child class such as:
class ChildClass(BaseClass):
#here I want to call the init function of the base class
If the init function of the base class takes some arguments that I am taking them as arguments of the child class's init function, how do I pass these arguments to the base class?
The code that I have written is:
class Car(object):
condition = "new"
def __init__(self, model, color, mpg):
self.model = model
self.color = color
self.mpg = mpg
class ElectricCar(Car):
def __init__(self, battery_type, model, color, mpg):
self.battery_type=battery_type
super(ElectricCar, self).__init__(model, color, mpg)
Where am I going wrong?
You could use super(ChildClass, self).__init__()
class BaseClass(object):
def __init__(self, *args, **kwargs):
pass
class ChildClass(BaseClass):
def __init__(self, *args, **kwargs):
super(ChildClass, self).__init__(*args, **kwargs)
Your indentation is incorrect, here's the modified code:
class Car(object):
condition = "new"
def __init__(self, model, color, mpg):
self.model = model
self.color = color
self.mpg = mpg
class ElectricCar(Car):
def __init__(self, battery_type, model, color, mpg):
self.battery_type=battery_type
super(ElectricCar, self).__init__(model, color, mpg)
car = ElectricCar('battery', 'ford', 'golden', 10)
print car.__dict__
Here's the output:
{'color': 'golden', 'mpg': 10, 'model': 'ford', 'battery_type': 'battery'}
As Mingyu pointed out, there is a problem in formatting. Other than that, I would strongly recommend not using the Derived class's name while calling super()
since it makes your code inflexible (code maintenance and inheritance issues). In Python 3, Use super().__init__
instead. Here is the code after incorporating these changes :
class Car(object):
condition = "new"
def __init__(self, model, color, mpg):
self.model = model
self.color = color
self.mpg = mpg
class ElectricCar(Car):
def __init__(self, battery_type, model, color, mpg):
self.battery_type=battery_type
super().__init__(model, color, mpg)
Thanks to Erwin Mayer for pointing out the issue in using __class__
with super()