20行Python代码实现图形化计算器

以下是一个使用Python编写的简单图形化计算器代码示例，代码不超过20行：\n\npython\nfrom tkinter import *\n\ndef button_click(number):\n current = entry.get()\n entry.delete(0, END)\n entry.insert(END, str(current) + str(number))\n\ndef button_clear():\n entry.delete(0, END)\n\ndef button_equal():\n result = eval(entry.get())\n entry.delete(0, END)\n entry.insert(END, result)\n\nroot = Tk()\nroot.title("Calculator")\n\nentry = Entry(root, width=30, borderwidth=5)\nentry.grid(row=0, column=0, columnspan=3, padx=10, pady=10)\n\nbutton_1 = Button(root, text="1", padx=40, pady=20, command=lambda: button_click(1))\nbutton_2 = Button(root, text="2", padx=40, pady=20, command=lambda: button_click(2))\nbutton_3 = Button(root, text="3", padx=40, pady=20, command=lambda: button_click(3))\nbutton_4 = Button(root, text="4", padx=40, pady=20, command=lambda: button_click(4))\nbutton_5 = Button(root, text="5", padx=40, pady=20, command=lambda: button_click(5))\nbutton_6 = Button(root, text="6", padx=40, pady=20, command=lambda: button_click(6))\nbutton_7 = Button(root, text="7", padx=40, pady=20, command=lambda: button_click(7))\nbutton_8 = Button(root, text="8", padx=40, pady=20, command=lambda: button_click(8))\nbutton_9 = Button(root, text="9", padx=40, pady=20, command=lambda: button_click(9))\nbutton_0 = Button(root, text="0", padx=40, pady=20, command=lambda: button_click(0))\nbutton_add = Button(root, text="+", padx=39, pady=20, command=lambda: button_click("+"))\nbutton_subtract = Button(root, text="-", padx=41, pady=20, command=lambda: button_click("-"))\nbutton_multiply = Button(root, text="*", padx=40, pady=20, command=lambda: button_click("*"))\nbutton_divide = Button(root, text="/", padx=41, pady=20, command=lambda: button_click("/"))\nbutton_equal = Button(root, text="=", padx=89, pady=20, command=button_equal)\nbutton_clear = Button(root, text="Clear", padx=79, pady=20, command=button_clear)\n\nbutton_1.grid(row=1, column=0)\nbutton_2.grid(row=1, column=1)\nbutton_3.grid(row=1, column=2)\nbutton_4.grid(row=2, column=0)\nbutton_5.grid(row=2, column=1)\nbutton_6.grid(row=2, column=2)\nbutton_7.grid(row=3, column=0)\nbutton_8.grid(row=3, column=1)\nbutton_9.grid(row=3, column=2)\nbutton_0.grid(row=4, column=0)\nbutton_add.grid(row=4, column=1)\nbutton_subtract.grid(row=4, column=2)\nbutton_multiply.grid(row=5, column=0)\nbutton_divide.grid(row=5, column=1)\nbutton_equal.grid(row=5, column=2, columnspan=2)\nbutton_clear.grid(row=6, column=0, columnspan=3)\n\nroot.mainloop()\n\n\n这段代码使用了tkinter模块来创建了一个简单的图形化计算器界面。用户可以通过按下按钮来输入数字和运算符，并通过"="按钮来计算结果。计算结果将显示在一个文本框中。