在该模型-视图-控制器（MVC）计算器中，我们使用按钮输入实现基本算术运算的计算器。

在该计算器中，模型负责执行实际计算，视图负责显示界面并将输入传递到控制器，控制器则从视图中获取输入并将其传递给模型进行计算。下面是代码示例：

模型:

class CalculatorModel:
    def __init__(self):
        self.operator = None
        self.operand1 = None
        self.operand2 = None

    def set_operator(self, operator):
        self.operator = operator

    def set_operand1(self, operand1):
        self.operand1 = operand1

    def set_operand2(self, operand2):
        self.operand2 = operand2

    def calculate(self):
        if self.operator == '+':
            return self.operand1 + self.operand2
        elif self.operator == '-':
            return self.operand1 - self.operand2
        elif self.operator == '*':
            return self.operand1 * self.operand2
        elif self.operator == '/':
            return self.operand1 / self.operand2

视图:

import tkinter as tk

class CalculatorView:
    def __init__(self, root):
        self.label = tk.Label(root, text="0")
        self.label.grid(row=0, column=0, columnspan=4)

        self.create_button(1, 0, "1")
        self.create_button(1, 1, "2")
        self.create_button(1, 2, "3")
        self.create_button(1, 3, "+")
        self.create_button(2, 0, "4")
        self.create_button(2, 1, "5")
        self.create_button(2, 2, "6")
        self.create_button(2, 3, "-")
        self.create_button(3, 0, "7")
        self.create_button(3, 1, "8