Run external python script in graphical mode

Questions
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1

I need to run a python script with opencv library in Mathematica. The mathematica command RunProcess[{"python3",ExpandFileName@"~/Documents/8_pyMathematica/pyMM/head_snake/ mm_call_python/show.py "}]
The code of show.py file :

import sys
import cv2
src = cv2.imread("test.jpg")
cv2.namedWindow("input", cv2.WINDOW_AUTOSIZE)
cv2.imshow("input", src)
cv2.waitKey(0)
cv2.destroyAllWindows()

test.jpg is shown as follow.
enter image description here

When I run the Mathematica command, I get an error

 "StandardError" -> "Traceback (most recent call last):
    File \"/home/zhou/Documents/8_pyMathematica/pyMM/head_snake/mm_call_python/show.py\", 
line 13, in <module>
      import cv2
  ImportError: /usr/lib/x86_64-linux-gnu/libatspi.so.0: undefined symbol: 
g_type_class_adjust_private_offset
  "|>

I refer to the question: https://mathematica.stackexchange.com/q/115069/72466. I try to use RunProcess[{"LD_LIBRARY_PATH=python3",ExpandFileName@"~/Documents/8_pyMathematica /pyMM/head_snake/mm_call_python/show.py "}]
It returns a error
RunProcess: Program LD_LIBRARY_PATH=python3 not found. Check Environment["PATH"].
The command is ran on Ubuntu 16.04. What is the general method to handle this kind of issues and how to fix this problem?