: no display name and no $DISPLAY environment variable

[shanshanhao]

when i am running blink_video.py, problem shows as follow:

[INFO] starting video stream thread...
Traceback (most recent call last):
File "blink_video.py", line 588, in
blink_detector(output_file,path)
File "blink_video.py", line 341, in blink_detector
top = tk.Tk()
File "/root/miniconda3/envs/myconda/lib/python3.5/tkinter/init.py", line 1876, in init
self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: no display name and no $DISPLAY environment variable