python + tips when opencv environment to build

First, the installation fails to install after installing Python OpenCV

Many online tutorials say use this:

pip install opencv-python

To install the OpenCV library, this fact has been used and then retry fails, is to use the right source, found crippled are:

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple opencv-python

In addition, if the local download, open my own website response speed is very slow, there is a faster link here:

https://pypi.org/search/?q=opencv-python

Here you can download the first well, and then installed in accordance offline.