python虚拟环境配置

1. install pip
   - goto[pip](https://pip.pypa.io/en/latest/installing.html)develop页面，download get-pip.py
   - python get-pip.py --proxy="[user:passwd@]proxy.server:port"
2. install virtualenv
   - pip install virtualenv
3. create virtual environment
   - mkdir xxx
   - virtualenv xxx
   - script ./bin/activate
4. install numpy, PIL, scipy
   - pip install numy
   - pip install PIL(如果找不到PIL，就用pip install pillow，这是PIL的fork)
5. install matplotlib
   - brew pkg-config [mac]
   - pip install matplotlib
6. install ipython
   - pip install ipython

如果要用python 做科学计算直接用scipy