anaconda下安装库出现UnsatisfiableError问题

利用命令行在Anaconda Prompt 安装PIL
利用命令conda install PIL出现问题如下：

(D:\Program Files\Anaconda3) C:\Users\lee>conda install PIL
Fetching package metadata ...........
Solving package specifications: .

UnsatisfiableError: The following specifications were found to be in conflict:
  - pil -> python 2.6*
  - python 3.5*
Use "conda info <package>" to see the dependencies for each package.

根据错误提示：pil按照默认源的配置是没有提供依赖Python3.5的包
解决方案：
1.创建一个新的Python2.6环境安装

conda create -n python2.6 pil
activate python2.6   #进入该环境
conda install pil    #安装pil包
deactivate        #退出该环境

2.创建一个新的基于python3.5 pil 的环境

conda create -n python3.5 -c menpo pil
activate python3.5   #进入该环境
conda install pil    #安装pil包
deactivate        #退出该环境