ubuntu 16.04安装cv2, opencv3,无需编译

遇到的问题：

cv2.error: OpenCV(3.4.2) /tmp/build/80754af9/opencv-suite_1535558553474/work/modules/highgui/src/window.cpp:632: error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvShowImage'

亲测可用步骤：

conda remove opencv
conda install -c menpo opencv
pip install --upgrade pip
pip install opencv-contrib-python

参考：https://stackoverflow.com/questions/40207011/opencv-not-working-properly-with-python-on-linux-with-anaconda-getting-error-th/41301866 第二个回答