Constructor in python | Default Constructor | Parameterized Constructor | Non-Parameterized

Your Queries: what is Constructor in python, what is Default Constructor what is Parameterized Constructor, what is Non-Parameterized constructor, types of constructors in python

Python Notes:
what is Constructors in Python | how to use Python Constructor and how we can use python constructor in OOP in Python
Constructors in Python?
When an object of a class is created in Python, a constructor is a special kind of method that is automatically called. Instance variables of a class are initialized using constructors. They are defined by using the init() method and share the same name as the class.


Types of Constructors in Python
In Python, there are three different kinds of constructors:

1. Default Constructor: This is the simplest constructor type and does not accept any parameters. Python automatically creates a default constructor when a class does not have one defined explicitly. All of the class’ instance variables are initialized to their default values by the default constructor.

2. Non-parameterized Constructor: This kind of constructor is explicitly defined by the programmer but does not accept any parameters. It is also known as the constructor without arguments. The instance variable values are initialized to some predetermined default values in this kind of constructor.
3. Parameterized Constructor: This type of constructor accepts one or more parameters and initializes the instance variables of the class with the values passed as arguments. It is also called the argument constructor.

Non-Parameterized Constructor:
A non-parameterized constructor is one which does not accept parameters. It is used to set some default values for the instance variables of a class and is explicitly defined by the programmer.
Example:
class Vehicle:
def __init__(self):
self.name = "BMW"
self.price = 200000
def getVechicleDetails(self, modelNo):
print("Name:", self.name)
print("Price:", self.price)
print(f'this is { self.name } with model no:{ modelNo }')
print('---------------')

print('---------------')
v1 = Vehicle()
v1.getVechicleDetails("i4")
v2 = Vehicle()
v2.getVechicleDetails("i7")


Default Constructor:
A default constructor is a constructor that takes no arguments and is defined implicitly by Python if no other constructor is defined. It initializes all the instance variables of a class to their default values. The default constructor is called automatically when an object of the class is created.
Example:
class Car:
def __init__(self):
print('It is a default constructor')
def getCarDetails(self):
print('It is a Car base class')

c = Car()
c.getCarDetails()


Example:
class BMWCarManufactrer:
def __init__(self, basePrice, color):
self.basePrice = basePrice
self.color = color
def getBMWDetails(self):
print("BMW Details")
print("Color:", self.color)
print("Base Price:", self.basePrice)
print('---------------')

print('---------------')
b1 = BMWCarManufactrer(200000, 'Blue')
b1.getBMWDetails()

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