错误：
import cv2 File "/usr/local/lib/python3.5/dist-packages/cv2/__init__.py", line 3, in <module> from .cv2 import * ImportError: libQtTest.so.4: cannot open shared object file: No such file or directory
解决方法：
sudo apt install libqt4-test
原文：https://www.cnblogs.com/zheh/p/9761532.html
ImportError: libQtTest.so.4: cannot open shared
原文：https://www.cnblogs.com/xiaodai0/p/10435894.html