Calculator with Method chaining in Python

method_chaining_calc.py

class Calculator():
    
    def __init__(self, variable):
        self.variable = variable
    
    def add(self, adition):
        self.variable = self.variable + adition
        print(self.variable)
        print ("Calculator.add() function called")
        return self
        
    def sub(self, subtraction):
        self.variable = self.variable - subtraction
        print(self.variable)
        print ("Calculator.sub() function called")
        return self
    
    def mul(self, multiplication):
        self.variable = self.variable * multiplication
        print(self.variable)
        print ("Calculator.mul() function called")
        return self
        
    def div(self, division):
        if division != 0:
            self.variable = self.variable / division
            print(self.variable)
            print ("Calculator.div() function called")
            return self
        else:
            print ("Calculator.div() function called")
            print ("Math Error")
            return self
            

a = 10
calc = Calculator(a)
calc = calc.add(6).sub(10).mul(4).div(3)