编写一个简单的计算器界面

要编写一个简单的计算器界面，你需要使用图形用户界面(GUI)库。以下是使用 Python 的 tkinter GUI 库编写的一个简单计算器界面示例：

from tkinter import *

class Calculator:
    def __init__(self, master):
        self.master = master
        master.title("简单计算器")

        self.display = Entry(master, width=30, borderwidth=5)
        self.display.grid(row=0, column=0, columnspan=4, padx=10, pady=10)

        # 创建按钮
        self.button_1 = Button(master, text="1", padx=40, pady=20, command=lambda: self.button_click(1))
        self.button_2 = Button(master, text="2", padx=40, pady=20, command=lambda: self.button_click(2))
        self.button_3 = Button(master, text="3", padx=40, pady=20, command=lambda: self.button_click(3))
        self.button_4 = Button(master, text="4", padx=40, pady=20, command=lambda: self.button_click(4))
        self.button_5 = Button(master, text="5", padx=40, pady=20, command=lambda: self.button_click(5))
        self.button_6 = Button(master, text="6", padx=40, pady=20, command=lambda: self.button_click(6))
        self.button_7 = Button(master, text="7", padx=40, pady=20, command=lambda: self.button_click(7))
        self.button_8 = Button(master, text="8", padx=40, pady=20, command=lambda: self.button_click(8))
        self.button_9 = Button(master, text="9", padx=40, pady=20, command=lambda: self.button_click(9))
        self.button_0 = Button(master, text="0", padx=40, pady=20, command=lambda: self.button_click(0))
        self.button_add = Button(master, text="+", padx=39, pady=20, command=self.button_add)
        self.button_clear = Button(master, text="清空", padx=77, pady=20, command=self.button_clear)
        self.button_equal = Button(master, text="=", padx=91, pady=20, command=self.button_equal)

        # 将按钮放置在界面上
        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_equal.grid(row=5, column=1, columnspan=2)

        self.first_number = None
        self.operation = None

    def button_click(self, number):
        current = self.display.get()
        self.display.delete(0, END)
        self.display.insert(0, str(current) + str(number))

    def button_clear(self):
        self.display.delete(0, END)
        self.first_number = None
        self.operation = None

    def button_add(self):
        self.first_number = float(self.display.get())
        self.display.delete(0, END)
        self.operation = "add"

    def button_equal(self):
        second_number = float(self.display.get())
        self.display.delete(0, END)

        if self.operation == "add":
            result = self.first_number + second_number
        else:
            result = self.first_number - second_number

        self.display.insert(0, result)

root = Tk()
calculator = Calculator(root)
root.mainloop()

这个计算器界面只支持加法和减法，但是你可以根据需要添加更多的操作。运行这个程序，你可以看到一个简单的计算器界面。