Python图形计算器：简单易用，仅10行代码！

import\ tkinter\ as\ tk\n\ndef\ evaluate():\n\ try:\n\ result\ =\ eval(entry.get())\n\ label.config(text\ =\ result)\n\ except:\n\ label.config(text\ =\ "Error")\n\n\ root\ =\ tk.Tk()\n\n\ entry\ =\ tk.Entry(root)\n\ entry.pack()\n\n\ button\ =\ tk.Button(root, text\ =\ "Calculate", command\ =\ evaluate)\n\ button.pack()\n\n\ label\ =\ tk.Label(root, text\ =\ "")\n\ label.pack()\n\n\ root.mainloop()