create_delete_env.md

1. create env

conda create --name env_xxx_py35 python=3.5

2. delete env

conda env remove --name myenv

3. clone env

conda create --name <env_name> --clone base

4. set conda source

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