给出代码，使用python编写一个带界面的计算器

代码如下：from tkinter import *# 创建窗口
root = Tk()
root.title('计算器')# 创建控件
entry = Entry(root, width=35, borderwidth=5)
entry.grid(row=0, column=0, columnspan=3, padx=10, pady=10)# 定义功能函数
def button_click(number):
# 删除当前输入
current = entry.get()
entry.delete(0, END)
# 拼接
entry.insert(0, str(current) + str(number))def button_clear():
entry.delete(0, END)def button_add():
first_number = entry.get()
global f_num
global math
math = "addition"
f_num = int(first_number)
entry.delete(0, END)def button_equal():
second_number = entry.get()
entry.delete(0, END)
if math == "addition":
entry.insert(0, f_num + int(second_number)) # 创建按钮
button_1 = Button(root, text="1", padx=40, pady=20, command=lambda: button_click(1))
button_2 = Button(root, text="2", padx=40, pady=20, command=lambda: button_click(2))
button_3 = Button(root, text="3", padx=40, pady=20, command=lambda: button_click(3))
button_4 = Button(root, text="4", padx=40, pady=20, command=lambda: button_click(4))
button_5 = Button(root, text="5", padx=40, pady=20, command=lambda: button_click(5))
button_6 = Button(root, text="6", padx=40, pady=20, command=lambda: button_click(6))
button_7 = Button(root, text="7", padx=40, pady=20, command=lambda: button_click(7))
button_8 = Button(root, text="8", padx=40, pady=20, command=lambda: button_click(8))
button_9 = Button(root, text="9", padx=40, pady=20, command=lambda: button_click(9))
button_0 = Button(root, text="0", padx=40, pady=20, command=lambda: button_click(0))
button_add = Button(root, text="+", padx=39, pady=20, command=button_add)
button_equal = Button(root, text="=", padx=91, pady=20, command=button_equal)
button_clear = Button(root, text="Clear", padx=79, pady=20, command=button_clear) # 按钮放置
button_1.grid(row=3, column=0)
button_2.grid(row=3, column=1)
button_3.grid(row=3, column=2) button_4.grid(row=2, column=0)
button_5.grid(row=2, column=1)
button_6.grid(row=2, column=2) button_7.grid(row=1, column=0)
button_8.grid(row=1, column=1)
button_9.grid(row=1, column=2) button_0.grid(row=4, column=0)
button_clear.grid(row=4, column=1, columnspan=2)
button_add.grid(row=5, column=0)
button_equal.grid(row=5, column=1, columnspan=2)# 运行程序
root.mainloop()