CODEWITHSUNDEEP
python-2.7inheritance
Zanam
Zanam

Reputation: 4807

Accessing parent class method error

I am trying to learn super implementation in Python and I have tried various help threads on SO but I am not able to implement the following code:

class Person:
    def __init__(self, first, last, age):
        self.firstname = first
        self.lastname = last
        self.age = age

    def __str__(self):
        return self.firstname + " " + self.lastname + ", " + str(self.age)

class Employee(Person):
    def __init__(self, first, last, age, staffnum):
        super(Employee, self).__init__(first, last, age)
        self.staffnumber = staffnum

    def __str__(self):
        return super(Employee, self).__str__() + ", " +  self.staffnumber


x = Person("Marge", "Simpson", 36)
y = Employee("Homer", "Simpson", 28, "1007")

print(x)
print(y)

What is wrong with this syntax in above code?

return super(Employee, self).__str__() + ", " +  self.staffnumber

Upvotes: 0

Views: 15

Answers (1)

kabanus
kabanus

Reputation: 25895

In Python 2.7 there are leftovers of the old hierarchy. Not all classes inherit from object, which is the default in Python 3. If you do not explicitly inherit object Python will use old style objects, which fail with Super which depends on this.

All you need to do is explicitly make sure all your objects eventually inherit object:

class Person(object):

In Python 3 this is 'fixed'.

An alternative is to forego super in favor of using the methods as class methods, which will work with both types of objects:

Person.__init__(self,first,last,age)
Person.__str__(self)

Upvotes: 1

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