"""Calculator for Network"""

class CalculatorNetwork:
    def __init__(self):
        self.memory = {}

    def set_variable(self, name, value):
        self.memory[name] = value

    def get_variable(self, name):
        return self.memory.get(name)

    def add(self, a, b):
        return a + b

    def subtract(self, a, b):
        return a - b

    def multiply(self, a, b):
        return a * b

    def divide(self, a, b):
        if b == 0:
            raise ZeroDivisionError("Cannot divide by zero")