We can create instance attrbitues for objects in Python. Can we create instance methods (not class Methods) as well in Python?

Question

How To create a methods which are common to a particular object just like creating instance attrbitue obj.instance_attribute A method which belongs specifically for a single object ?

The link contains the code. I need to create method only for this object and not all instance of class. Creating class methods and attribute. The instance attrbitue. How to create instance methods

class A(): def init(self): self.class_variable = 999999 def class_methods(self): #available to all object print("Hey")

obj = A() obj.class_variable 999999 obj.class_methods() Hey obj.instance_attribute = 40404040 #common to particular object obj.instance_attribute 40404040 #a method which is common to only this object obj.new_method():

SyntaxError: invalid syntax

obj.new_mehtod(self):

SyntaxError: invalid syntax

Answer 1

I think you are mixing up terminology. Every "normal" method is a instance method - that means it applies the function without affecting any other instances of this class. To reference the instance, use the passed self keyword.

Defining a method for a single instance inside the generator/ class definition does not make sense in an OOP-context. If you create a car class, every instance of this class should be able to access its methods, like drive(). The only way to add a unique function is to add it after instantiating the object. This can be done with the types.MethodType method, which binds the function to the class instance:

from types import MethodType
def fly(self):
    print(f"i, {self.name}, can fly")


class Car:
    def __init__(self, name):
        self.name = name


car_1 = Car("car one")
car_2 = Car("car two")
car_1.fly = MethodType(fly, car_1)
car_1.fly() # i, car one, can fly
car_2.fly() # AttributeError: 'Car' object has no attribute 'fly'

As you can see, car_1 has the class fly, which references car_1's name, while car_2 does not have this function.

But you should seriously reconsider what you are trying to achieve here.