Python inheritance child class raising error

Question

class student():
    def __init__(self,fname,lname):
        self.name = fname
        self.lastname = lname
    def printthis(self):
        print(self.name,self.lastname)


class person(student):
    def __init__(self,fname,lname,age):
        student. __init__ (fname, lname)
        self.umar = age
    def wlcm(self):
        print(self.name,self.lastname,self.umar)
e = student("HARJOT", "GILL", 20)
e.wlcm()

Can anyone please explain what I am doing wrong here it gives me an error (TypeError: student.init() takes 3 positional arguments but 4 were given) I am unable to figure out. the child class is raising the problem.

Answer 1

Are you looking for something like this?

When you want to initialize child class using parent's init, you should call -> super().init(params)

class student:
    def __init__(self, fname, lname):
        self.name = fname
        self.lastname = lname

    def pprint(self):
        print(self.name, self.lastname)

class person(student):
    def __init__(self, fname, lname, age):
        super().__init__(fname, lname)
        self.umar = age

    def pprint(self):
        print(self.name, self.lastname, self.umar)

s = person('c', 'mor', 27)
s.pprint()