Python Method Objects

In this tutorial, we will learn python in detail.

Object is an instance of a class. Objects can contain methods.

An object consists of :

• State :It is represented by attributes of an object. It also replicates the properties of an object.
• Behavior :It is represented by methods of an object. It also replicates the response of an object with other objects.
• Identity :It gives a unique name to an object and allows one object to interact with other objects.

Example:

class Person:
  def __init__(self, name, age):
    self.name = name
    self.age = age

  def myfunc(self):
    print("Hello my name is " + self.name)

p1 = Person("Peter", 36)
p1.myfunc()

Output:

Hello my name is Peter

Self parameter is used to access variables that belong to class. It need not to be named self always, you can call it whatever you like, but it has to be the first parameter of any function in the class.

Example:

class Person:
  def __init__(mysillyobject, name, age):
    mysillyobject.name = name
    mysillyobject.age = age

  def myfunc(abc):
    print("Hello my name is " + abc.name)

p1 = Person("Peter", 36)
p1.myfunc()

Output:

Hello my name is Peter

You can modify object properties. It is as shown below.

Example:

class Person:
  def __init__(self, name, age):
    self.name = name
    self.age = age

  def myfunc(self):
    print("Hello my name is " + self.name)

p1 = Person("Peter", 40)

p1.age = 50

print(p1.age)

Output:

50

You can delete object properties using the del keyword

Example:

class Person:
  def __init__(self, name, age):
    self.name = name
    self.age = age

  def myfunc(self):
    print("Hello my name is " + self.name)

p1 = Person("Peter", 40)

del p1.age

print(p1.age)

Output:

Traceback (most recent call last):
  File "demo_class7.py", line 13, in <module>
    print(p1.age)
AttributeError: 'Person' object has no attribute 'age'

You can also delete objects using the del keyword.

Example:

class Person:
  def __init__(self, name, age):
    self.name = name
    self.age = age

  def myfunc(self):
    print("Hello my name is " + self.name)

p1 = Person("Peter", 40)

del p1

print(p1)

Output:

Traceback (most recent call last):
  File "demo_class8.py", line 13, in <module>
    print(p1)
NameError: 'p1' is not defined