用python做一个计算器，第一行为文本框文字内容右对齐用来放计算器计算内容，第二行包含清空按钮ac和加号按钮其中ac占三列，第三行包含1，2，3和减号，第四行包含4，5，6和乘号，第五行包含7，8，9 和除号，第六行包含0和点和等号其中0占两列

以下是用Python实现计算器的代码：

import tkinter as tk

class Calculator:
    def __init__(self, master):
        self.master = master
        master.title("Calculator")

        # 创建文本框
        self.display = tk.Entry(master, width=30, justify="right")
        self.display.grid(row=0, column=0, columnspan=4, padx=5, pady=5)

        # 创建按钮
        self.create_button("AC", 1, 0, 3, self.clear)
        self.create_button("+", 1, 3, self.add)
        self.create_button("1", 2, 0, self.add_number, 1)
        self.create_button("2", 2, 1, self.add_number, 2)
        self.create_button("3", 2, 2, self.add_number, 3)
        self.create_button("-", 2, 3, self.subtract)
        self.create_button("4", 3, 0, self.add_number, 4)
        self.create_button("5", 3, 1, self.add_number, 5)
        self.create_button("6", 3, 2, self.add_number, 6)
        self.create_button("*", 3, 3, self.multiply)
        self.create_button("7", 4, 0, self.add_number, 7)
        self.create_button("8", 4, 1, self.add_number, 8)
        self.create_button("9", 4, 2, self.add_number, 9)
        self.create_button("/", 4, 3, self.divide)
        self.create_button("0", 5, 0, self.add_number, 0, columnspan=2)
        self.create_button(".", 5, 2, self.add_decimal)
        self.create_button("=", 5, 3, self.calculate)

    def create_button(self, text, row, column, command=None, value=None, columnspan=1):
        button = tk.Button(self.master, text=text, width=7, height=2, command=lambda: command(value) if value else command(), padx=5, pady=5)
        button.grid(row=row, column=column, columnspan=columnspan, padx=5, pady=5)

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

    def add_decimal(self):
        current = self.display.get()
        if "." not in current:
            self.display.delete(0, tk.END)
            self.display.insert(0, str(current) + ".")

    def clear(self):
        self.display.delete(0, tk.END)

    def add(self):
        self.operator = "+"
        self.first_number = float(self.display.get())
        self.display.delete(0, tk.END)

    def subtract(self):
        self.operator = "-"
        self.first_number = float(self.display.get())
        self.display.delete(0, tk.END)

    def multiply(self):
        self.operator = "*"
        self.first_number = float(self.display.get())
        self.display.delete(0, tk.END)

    def divide(self):
        self.operator = "/"
        self.first_number = float(self.display.get())
        self.display.delete(0, tk.END)

    def calculate(self):
        second_number = float(self.display.get())
        self.display.delete(0, tk.END)
        if self.operator == "+":
            result = self.first_number + second_number
        elif self.operator == "-":
            result = self.first_number - second_number
        elif self.operator == "*":
            result = self.first_number * second_number
        elif self.operator == "/":
            result = self.first_number / second_number
        self.display.insert(0, str(result))

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

运行以上代码，将会生成一个简单的计算器应用。