Python Constructors (def __init__)

Python Constructors (def __init__)

In Object-Oriented Programing, a constructor is used to initialise object variables when we create a new object based on a given class. If we had a class called  Student with variables Name, Phone, Email, each time we create a new Student object, we need to supply the values of Name, Phone and Email.

In Python, we would create such a class as follows:

class Student:
    def __init__(self, name, phone, email):
        self.name = name
        self.phone= phone
        self.email= email
        # return statement removed from here

We can create a Student object as follows:

s1=Student("Genghis Khan", "+123456789","Genghis.Khan@gmail.com")

We can acess the object variables of the Student called s1 as follows:



print(s1.name)

print(s1.phone)

print(s1.email)



In IDLE, the program looks as follows:

Output:

The keyword "self" refers to the object we have created. 
Sometimes we have default values for the constructor variables.