写一个带画面的计算器的Python程序

以下是一个带画面的计算器Python程序，使用了Tkinter模块来创建图形界面：

import tkinter as tk

# 定义计算器类
class Calculator:
    def __init__(self, master):
        self.master = master
        master.title("计算器")

        # 创建输入框
        self.entry = tk.Entry(master, width=40, borderwidth=5)
        self.entry.grid(row=0, column=0, columnspan=4, padx=10, pady=10)

        # 创建数字按钮
        self.button_1 = tk.Button(master, text="1", padx=40, pady=20, command=lambda: self.button_click(1))
        self.button_2 = tk.Button(master, text="2", padx=40, pady=20, command=lambda: self.button_click(2))
        self.button_3 = tk.Button(master, text="3", padx=40, pady=20, command=lambda: self.button_click(3))
        self.button_4 = tk.Button(master, text="4", padx=40, pady=20, command=lambda: self.button_click(4))
        self.button_5 = tk.Button(master, text="5", padx=40, pady=20, command=lambda: self.button_click(5))
        self.button_6 = tk.Button(master, text="6", padx=40, pady=20, command=lambda: self.button_click(6))
        self.button_7 = tk.Button(master, text="7", padx=40, pady=20, command=lambda: self.button_click(7))
        self.button_8 = tk.Button(master, text="8", padx=40, pady=20, command=lambda: self.button_click(8))
        self.button_9 = tk.Button(master, text="9", padx=40, pady=20, command=lambda: self.button_click(9))
        self.button_0 = tk.Button(master, text="0", padx=40, pady=20, command=lambda: self.button_click(0))

        # 创建运算符按钮
        self.button_add = tk.Button(master, text="+", padx=39, pady=20, command=self.button_add)
        self.button_subtract = tk.Button(master, text="-", padx=41, pady=20, command=self.button_subtract)
        self.button_multiply = tk.Button(master, text="*", padx=40, pady=20, command=self.button_multiply)
        self.button_divide = tk.Button(master, text="/", padx=41, pady=20, command=self.button_divide)
        self.button_equal = tk.Button(master, text="=", padx=91, pady=20, command=self.button_equal)
        self.button_clear = tk.Button(master, text="清空", padx=79, pady=20, command=self.button_clear)

        # 将数字按钮和运算符按钮放置在界面上
        self.button_1.grid(row=3, column=0)
        self.button_2.grid(row=3, column=1)
        self.button_3.grid(row=3, column=2)

        self.button_4.grid(row=2, column=0)
        self.button_5.grid(row=2, column=1)
        self.button_6.grid(row=2, column=2)

        self.button_7.grid(row=1, column=0)
        self.button_8.grid(row=1, column=1)
        self.button_9.grid(row=1, column=2)

        self.button_0.grid(row=4, column=0)

        self.button_clear.grid(row=4, column=1, columnspan=2)
        self.button_add.grid(row=5, column=0)
        self.button_subtract.grid(row=6, column=0)
        self.button_multiply.grid(row=6, column=1)
        self.button_divide.grid(row=6, column=2)

        self.button_equal.grid(row=5, column=1, columnspan=2)

        # 定义变量
        self.num1 = None
        self.num2 = None
        self.operator = None
        self.result = None

    # 处理数字按钮点击事件
    def button_click(self, number):
        current = self.entry.get()
        self.entry.delete(0, tk.END)
        self.entry.insert(0, str(current) + str(number))

    # 处理运算符按钮点击事件
    def button_add(self):
        self.num1 = float(self.entry.get())
        self.operator = "+"
        self.entry.delete(0, tk.END)

    def button_subtract(self):
        self.num1 = float(self.entry.get())
        self.operator = "-"
        self.entry.delete(0, tk.END)

    def button_multiply(self):
        self.num1 = float(self.entry.get())
        self.operator = "*"
        self.entry.delete(0, tk.END)

    def button_divide(self):
        self.num1 = float(self.entry.get())
        self.operator = "/"
        self.entry.delete(0, tk.END)

    # 处理等于号按钮点击事件
    def button_equal(self):
        self.num2 = float(self.entry.get())
        self.entry.delete(0, tk.END)

        if self.operator == "+":
            self.result = self.num1 + self.num2
        elif self.operator == "-":
            self.result = self.num1 - self.num2
        elif self.operator == "*":
            self.result = self.num1 * self.num2
        elif self.operator == "/":
            self.result = self.num1 / self.num2

        self.entry.insert(0, self.result)

    # 处理清空按钮点击事件
    def button_clear(self):
        self.entry.delete(0, tk.END)
        self.num1 = None
        self.num2 = None
        self.operator = None
        self.result = None

# 创建主窗口
root = tk.Tk()

# 创建计算器对象
calculator = Calculator(root)

# 运行主循环
root.mainloop()

该程序通过Tkinter模块创建了一个图形界面，包括数字按钮、运算符按钮、输入框和清空按钮等，用户可以通过点击按钮来进行数字输入和四则运算。在程序中，通过定义一个Calculator类来处理各个按钮的点击事件，并将结果显示在输入框中。