A constructor is a special method in a class that runs automatically when an object is created.<\/p>\n\n\n\n
In Python, the constructor method is called It is used to:<\/p>\n\n\n\n When the object Most constructors accept parameters to initialize object attributes.<\/p>\n\n\n\n Explanation:<\/p>\n\n\n\n If you do not define a constructor, Python automatically provides a default constructor that does nothing.<\/p>\n\n\n\n This works even without No parameters except Accepts arguments.<\/p>\n\n\n\n Each object has its own data.<\/p>\n\n\n\n \u2022 Constructor name must be A constructor initializes the object when it is created.__init__()<\/code>.<\/p>\n\n\n\n\n
BASIC SYNTAX<\/strong><\/h2>\n\n\n\n
class ClassName:
def __init__(self):
# initialization code<\/pre>\n\n\n\nSIMPLE EXAMPLE<\/strong><\/h2>\n\n\n\n
class Student:
def __init__(self):
print(\"Constructor is called.\")s1 = Student()<\/pre>\n\n\n\ns1<\/code> is created, the constructor runs automatically.<\/p>\n\n\n\nCONSTRUCTOR WITH PARAMETERS<\/strong><\/h2>\n\n\n\n
class Student:
def __init__(self, name, age):
self.name = name
self.age = ages1 = Student(\"Hira\", 22)print(s1.name)
print(s1.age)<\/pre>\n\n\n\n\n
__init__<\/code> is the constructor<\/li>\n\n\n\nself<\/code> refers to the current object<\/li>\n\n\n\nname<\/code> and age<\/code> are object attributes<\/li>\n<\/ul>\n\n\n\nDEFAULT CONSTRUCTOR<\/strong><\/h2>\n\n\n\n
class Car:
passcar1 = Car()<\/pre>\n\n\n\n__init__()<\/code>.<\/p>\n\n\n\nTYPES OF CONSTRUCTORS<\/strong><\/h2>\n\n\n\n
1. Default Constructor<\/h3>\n\n\n\n
self<\/code>.<\/p>\n\n\n\nclass Example:
def __init__(self):
print(\"Default constructor\")<\/pre>\n\n\n\n2. Parameterized Constructor<\/h3>\n\n\n\n
class Example:
def __init__(self, value):
self.value = value<\/pre>\n\n\n\nMULTIPLE OBJECTS WITH CONSTRUCTOR<\/strong><\/h2>\n\n\n\n
class Car:
def __init__(self, brand):
self.brand = brandcar1 = Car(\"Toyota\")
car2 = Car(\"BMW\")print(car1.brand)
print(car2.brand)<\/pre>\n\n\n\nIMPORTANT POINTS<\/strong><\/h2>\n\n\n\n
__init__<\/code>
\u2022 It runs automatically when object is created
\u2022 Used to initialize object attributes
\u2022 self<\/code> is required as the first parameter<\/p>\n\n\n\nKEY TAKEAWAY<\/strong><\/h2>\n\n\n\n
It helps assign values and prepare the object for use in a clean and structured way.<\/p>\n\n\n