帮我做一份PYTHON采用面向对象的思想设计复杂计算器界面，要求界面整洁，

好的，我可以为您提供一个面向对象的计算器界面的设计。首先，我们需要定义一个 Calculator 类，它将包含所有的计算器操作和界面。

import tkinter as tk

class Calculator:
    def __init__(self, master):
        self.master = master
        self.master.title("Calculator")
        self.master.geometry("300x400")
        self.master.resizable(False, False)

        # Create input field
        self.input_field = tk.Entry(self.master, width=30, font=("Arial", 14))
        self.input_field.grid(row=0, column=0, columnspan=4, padx=5, pady=5)

        # Create buttons
        self.button_1 = tk.Button(self.master, text="1", width=7, height=3, font=("Arial", 12), command=lambda: self.button_click(1))
        self.button_2 = tk.Button(self.master, text="2", width=7, height=3, font=("Arial", 12), command=lambda: self.button_click(2))
        self.button_3 = tk.Button(self.master, text="3", width=7, height=3, font=("Arial", 12), command=lambda: self.button_click(3))
        self.button_4 = tk.Button(self.master, text="4", width=7, height=3, font=("Arial", 12), command=lambda: self.button_click(4))
        self.button_5 = tk.Button(self.master, text="5", width=7, height=3, font=("Arial", 12), command=lambda: self.button_click(5))
        self.button_6 = tk.Button(self.master, text="6", width=7, height=3, font=("Arial", 12), command=lambda: self.button_click(6))
        self.button_7 = tk.Button(self.master, text="7", width=7, height=3, font=("Arial", 12), command=lambda: self.button_click(7))
        self.button_8 = tk.Button(self.master, text="8", width=7, height=3, font=("Arial", 12), command=lambda: self.button_click(8))
        self.button_9 = tk.Button(self.master, text="9", width=7, height=3, font=("Arial", 12), command=lambda: self.button_click(9))
        self.button_0 = tk.Button(self.master, text="0", width=7, height=3, font=("Arial", 12), command=lambda: self.button_click(0))
        self.button_add = tk.Button(self.master, text="+", width=7, height=3, font=("Arial", 12), command=lambda: self.button_click("+"))
        self.button_subtract = tk.Button(self.master, text="-", width=7, height=3, font=("Arial", 12), command=lambda: self.button_click("-"))
        self.button_multiply = tk.Button(self.master, text="*", width=7, height=3, font=("Arial", 12), command=lambda: self.button_click("*"))
        self.button_divide = tk.Button(self.master, text="/", width=7, height=3, font=("Arial", 12), command=lambda: self.button_click("/"))
        self.button_clear = tk.Button(self.master, text="C", width=7, height=3, font=("Arial", 12), command=self.clear)
        self.button_equals = tk.Button(self.master, text="=", width=7, height=3, font=("Arial", 12), command=self.equals)

        # Position buttons
        self.button_clear.grid(row=1, column=0)
        self.button_divide.grid(row=1, column=1)
        self.button_multiply.grid(row=1, column=2)
        self.button_subtract.grid(row=1, column=3)

        self.button_7.grid(row=2, column=0)
        self.button_8.grid(row=2, column=1)
        self.button_9.grid(row=2, column=2)
        self.button_add.grid(row=2, column=3)

        self.button_4.grid(row=3, column=0)
        self.button_5.grid(row=3, column=1)
        self.button_6.grid(row=3, column=2)

        self.button_1.grid(row=4, column=0)
        self.button_2.grid(row=4, column=1)
        self.button_3.grid(row=4, column=2)
        self.button_equals.grid(row=4, column=3)

        self.button_0.grid(row=5, column=0, columnspan=2)
        
        # Initialize calculator state
        self.clear()

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

    def clear(self):
        self.input_field.delete(0, tk.END)
        self.operation = None
        self.first_number = None

    def equals(self):
        second_number = float(self.input_field.get())
        self.input_field.delete(0, tk.END)

        if self.operation == "+":
            result = self.first_number + second_number
        elif self.operation == "-":
            result = self.first_number - second_number
        elif self.operation == "*":
            result = self.first_number * second_number
        elif self.operation == "/":
            result = self.first_number / second_number

        self.input_field.insert(0, str(result))
        self.operation = None
        self.first_number = None

    def button_add(self):
        self.operation = "+"
        self.first_number = float(self.input_field.get())
        self.input_field.delete(0, tk.END)

    def button_subtract(self):
        self.operation = "-"
        self.first_number = float(self.input_field.get())
        self.input_field.delete(0, tk.END)

    def button_multiply(self):
        self.operation = "*"
        self.first_number = float(self.input_field.get())
        self.input_field.delete(0, tk.END)

    def button_divide(self):
        self.operation = "/"
        self.first_number = float(self.input_field.get())
        self.input_field.delete(0, tk.END)

在这个类中，我们首先定义了一个初始化方法来设置计算器的初始状态，包括窗口标题、大小和不可调整大小。我们还创建了文本框和按钮，每个按钮都有一个相应的命令。

我们还定义了一些其他的方法来处理按钮点击事件和计算器操作。例如，button_click() 方法将数字添加到文本框中，clear() 方法将文本框清空并重置计算器状态，equals() 方法执行计算操作并显示结果。

最后，我们将所有的按钮放置在计算器窗口中，使用 grid() 方法来指定它们的位置。这个方法让我们可以指定每个按钮在窗口中的行和列。

这就是一个简单的面向对象的计算器界面的设计。您可以根据自己的需要进行修改和扩展。