1.新增清華映象源（參考網址：https://jingyan.baidu.com/article/1876c8527be1c3890a137645.html）

（注：windows下網址不需要單引號括起來，否則會出錯）

conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/

conda config --set show_channel_urls yes

conda info

conda install scrapy

2.conda換回預設源

conda config --remove-key channels
 

方法一：https://www.cnblogs.com/MrLJC/p/4245925.html

conda install -c https://conda.binstar.org/menpo opencv

方法二：https://stackoverflow.com/questions/23119413/how-do-i-install-python-opencv-through-conda

conda install --channel https://conda.anaconda.org/menpo opencv3