Advance-python/10_Instance method.py at first-python · Archana98-bit/Advance-python · GitHub

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# Instance Method :
# a)
class Calculation :
    def __init__(self, x, y) :
        self.x = x
        self.y = y

    def add(self) :
        result1 = self.x + self.y
        print(f'addition is {result1}')

    def sub(self) :
        result2 = self.x - self.y
        print(f'substraction is {result2}')

c1 = Calculation(100, 200)
c1.add()

c2 = Calculation(100, 80)
c2.sub()


# b) call instance method inside another instance method :
class Calculation :
    def __init__(self, x, y) :
        self.x = x
        self.y = y

    def add(self) :
        result = self.x + self.y
        print(f'addition is {result}')
        self.sub()

    def sub(self) :
        result = self.x - self.y
        print(f'substraction is {result}')

c1 = Calculation(300, 200)
c1.add()


# c) call instance method outside of the class as well as inside of class :
class Calculation :
    def __init__(self, x, y) :
        self.x = x
        self.y = y

    def add(self) :
        result = self.x + self.y
        print(f'addition is {result}')
        self.sub()

    def sub(self) :
        result = self.x - self.y
        print(f'substraction is {result}')

c1 = Calculation(30, 20)
c1.add()
c1.sub()


# d) by using instance method we can operate modify, delete etc.
class Test :
    def __init__(self, a, b) :
        self.a = a
        self.b = b

    def update(self, x, y) :
        self.a = x
        self.b = y

    def delete(self) :
        del self.a

t1 = Test(10, 20)
print(t1.__dict__)

t1.update(100, 300)
print(t1.__dict__)

t1.delete()
print(t1.__dict__)