Python Constructor is the special function that is automatically executed when an object of a class is created. Python __init__ function is to act as a Constructor.
def __init__(self, [args ……..]):
<statements>Python Destructor is also a special method that gets executed automatically when an object exit from the scope. In Python, __del__( ) method is used as the destructor.
Examples of Constructor and destructor in Python
Simple example code:
Python constructor is executed automatically when the object is created. This constructor function can have arguments.
class Sample:
def __init__(self, num):
print("Constructor of class Sample...")
self.num = num
print("The value is :", num)
S = Sample(100)
Output:
Example program to illustrate the del( ) method
class Sample:
num = 0
def __init__(self, var):
Sample.num += 1
self.var = var
print("Object value is = ", var)
print("Variable value = ", Sample.num)
def __del__(self):
Sample.num -= 1
print("Object with value %d is exit from the scope" % self.var)
S1 = Sample(10)
Output:
Object value is = 10
Variable value = 1
Object with value 10 is exit from the scope
When is Constructor and destructor called in Python?
Answer: Constructor and destructor functions are automatically executed in Python. Constructor when an object of a class is created and Destructor when an object exit from the scope.
Do comment if you have any doubts or suggestions on this Python basic tutorial.
Note: IDE: PyCharm 2021.3.3 (Community Edition)
Windows 10
Python 3.10.1
All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.