问通过SSH连接到raspberry-pi的计算机，不能在计算机上显示Tkinter-窗口或raspberry-pi。

EN

from Tkinter import *
import RPi.GPIO as GPIO
import time

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(18, GPIO.OUT)
GPIO.setup(23, GPIO.OUT)
GPIO.setup(24, GPIO.OUT)
GPIO.setup(25, GPIO.OUT)

class App:

    def __init__(self, master):
        frame = Frame(master)
        frame.pack()
        self.check_var1 = BooleanVar()
        check = Checkbutton(frame, text='red',
                 command=self.update1,
                 variable=self.check_var1, onvalue=True, offvalue=False)
        check.grid(row=1)


        self.check_var2 = BooleanVar()
        check = Checkbutton(frame, text='green',
                 command=self.update2,
                 variable=self.check_var2, onvalue=True, offvalue=False)
        check.grid(row=3)



        self.check_var3 = BooleanVar()
        check = Checkbutton(frame, text='blue',
                 command=self.update3,
                 variable=self.check_var3, onvalue=True, offvalue=False)
        check.grid(row=5)


        self.check_var4 = BooleanVar()
        check = Checkbutton(frame, text='red2',
                 command=self.update4,
                 variable=self.check_var4, onvalue=True, offvalue=False)
        check.grid(row=7)

    def update1(self):
        GPIO.output(18, self.check_var1.get())

    def update2(self):
        GPIO.output(23, self.check_var2.get())

    def update3(self):
        GPIO.output(24, self.check_var3.get())

    def update4(self):
        GPIO.output(25, self.check_var4.get())

root = Tk()
root.wm_title('On / Off Switch')
app = App(root)
root.geometry("1920x1080+0+0")
root.mainloop()

> pi@raspberrypi:~ $ sudo python gui_switch.py
No protocol specified
No protocol specified
Traceback (most recent call last):
  File "gui_switch.py", line 88, in <module>
    root = Tk()
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1813, in __init__
    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: couldn't connect to display ":0.0"