How to do multiple inheritance from different classes in python using super()?-CodePudding

Lets say we have different kind of people, pianist,programmer and multitalented person. so, How do i inherit like this? currently this code gives error Multitalented has no attribute canplaypiano.

class Pianist:
    def __init__(self):
        self.canplaypiano=True

class Programer:
    def __init__(self):
        self.canprogram=True

class Multitalented(Pianist,Programer):
    def __init__(self):
        self.canswim=True
        super(Pianist,self).__init__()
        super(Programer,self).__init__()

Raju=Multitalented()

print(Raju.canswim)
print(Raju.canprogram)
print(Raju.canplaypiano)

Also Please mention some well written article about python inheritance/super() i couldnt find a perfect article with clear explaination. thankyou.

CodePudding user response：

All classes involved in cooperative multiple inheritance need to use super, even if the static base class is just object.

class Pianist:
    def __init__(self):
        super().__init__()
        self.canplaypiano=True

class Programer:
    def __init__(self):
        super().__init__()
        self.canprogram=True

class Multitalented(Pianist,Programer):
    def __init__(self):
        super().__init__()
        self.canswim=True
        
Raju=Multitalented()

print(Raju.canswim)
print(Raju.canprogram)
print(Raju.canplaypiano)

The order in which the initializers run is determined by the method resolution order for Multitalented, which you can affect by changing the order in which Multitalented lists its base classes.

The first, if not best, article to read is Raymond Hettinger's Python's super() Considered Super!, which also includes advice on how to adapt classes the don't themselves use super for use in a cooperative multiple-inheritance hierarchy, as well as advice on how to override a function that uses super (in short, you can't change the signature).

CodePudding user response：

Dont call super with explicit parent classes. In modern python versions (don't know exactly since which version) you call super without parameters. That is, in you case you should have had only one line, not two:

super().__init__()

In somewhat older versions you need to provide the class explicitly, however you should provide the class of "current" object, and the super function takes care of finding out the parent classes. In you case it should be:

super(Multitalented, self).__init__()