TypeError: descriptor '__init__' requires a 'super' object but received a 'str'

Question

Using Python 3.X as the interpreter. I just had inherited the Employee class with two of the derived class as Developer and Manager.

The below code is throwing a Type Error: '__init__' requires a 'super' object but received a 'str'.
I'm not getting why exactly it's happening, I don't find any problem with the program yet.

class Employee:
    raise_amount=1.05
    emp_count=0
    def __init__(self,first_name,last_name, amount):
        self.first_name=first_name
        self.last_name=last_name
        self.amount=amount
        self.email_id="{0}.{1}@{1}.com" .format(first_name,last_name)
        Employee.emp_count +=1

    def fullname(self):
        print ("%s %s"%(self.first_name,self.last_name))

    def print1(self):
        print (self.email)
        print ("Total no of Employee are :%d" %(Employee.emp_count))


    def raise_amount(self):
        self.amount *=self.raise_amount
        return self.amount


class Developer(Employee):
    raise_amount = 1.10
    def __init__(self,f,l,a,prog):
        super.__init__(f,l,a)
        self.programming=prog

class Manager(Employee):
    def __init__(self,f,l,a,emp=None):
        super.__init__(f,l,a)
        if emp is None:
            self.my_employee=[]
        else:
            self.my_employee=emp



    def add_employee(self,emp):
        if emp in self.my_employee:
            print("employee is already exist")
        else:
            self.my_employee.append(emp)

    def remove_employee(self,emp):
        if emp in self.my_employee:
            self.my_employee.remove(emp)

    def print_employee(self):
        for emp in self.my_employee:
            print (emp.fullnamme())



dev1=Developer("subhendu","panda",500000,"Python")
dev1.raise_amount()
dev2=Developer('Aditya','bishoyi',5688989,'java')
dev2.fullname()
dev1.fullname()
emp1=Employee("tonu","trip",30000)
emp1.raise_amount()
emp1.fullname()
mgr1=Manager("Biplab","choudhury",5000000)
mgr1.fullname()
mgr1.add_employee(dev1)
mgr1.add_employee(emp1)
mgr1.add_employee(dev2)
mgr1.print_employee()
mgr1.remove_employee(dev1)
mgr1.print_employee()

Error trace:

Traceback (most recent call last): 
File "C:/Users/Subhendu/PycharmProjects/hello/inheritance.py", line 56, in 
<module> dev1=Developer("subhendu","panda",500000,"Python") 
File "C:/Users/Subhendu/PycharmProjects/hello/inheritance.py", line 27, in
init super.__init__(f,l,a) TypeError: descriptor 'init' requires a 'super'
object but received a 'str'

Answer 1

Change all of your super.__init__(...) calls to super().__init__(...). The problem was the missing pair of parentheses ().

From the official Python 3.3 reference here, super is actually a built-in function with the signature super([type[, object-or-type]]).