A constructor is a special kind of method which is used for initializing the instance variables during object creation.
Python relies on the constructor to perform tasks such as initializing (assigning values to) any instance variables that the object will need when it starts.
Constructor definition is called automatically whenever an object of that class is created.
There are two types of Constructors.
def __init__(self):
#now all about the constructor
Here, __init__ is used for the constructor to a class. The self parameter refers to the instance of the object (like, this in C++).
class Student:
def __init__(self,name,id):
self.id = id;
self.name = name;
def display (self):
print(self.id)
print(self.name)
Std1 = Student("Prayag", 101)
Std2 = Student("Rahul", 102)
Std1.display()
Std2.display()
101 Prayag 102 Rahul
A Constructor, which has no parameter or arguments is called Non-Parameterized constructor.
class Student:
# Constructor - non parameterized
def __init__(self):
print("This is non parametrized constructor")
def show(self,name):
print("Hello",name)
student = Student()
student.show("Prayag")
This is non parametrized constructor Hello Prayag
A Constructor, which has parameter or arguments is called Non-Parameterized constructor.
class Student:
# Constructor - parameterized
def __init__(self, name):
print("This is parametrized constructor")
self.name = name
def show(self):
print("Hello",self.name)
student = Student("Prayag")
student.show()
Here, name is assigned as a parameter which is being passed through the constructor __init__.
This is parametrized constructor Hello Prayag