Python 类封装计算器：简化数学运算

class Calculator:
    def add(self, x, y):
        return x + y
    
    def subtract(self, x, y):
        return x - y
    
    def multiply(self, x, y):
        return x * y
    
    def divide(self, x, y):
        if y != 0:
            return x / y
        else:
            return 'Error: division by zero'

使用方法：

calculator = Calculator()
result = calculator.add(5, 3)
print(result)  # 输出：8

result = calculator.subtract(5, 3)
print(result)  # 输出：2

result = calculator.multiply(5, 3)
print(result)  # 输出：15

result = calculator.divide(5, 3)
print(result)  # 输出：1.6666666666666667

result = calculator.divide(5, 0)
print(result)  # 输出：Error: division by zero