参考URL：

http://www.cnblogs.com/haython/p/3970426.html

http://www.pythondoc.com/flask/installation.html#installation

easy_install和pip都是用来下载安装Python一个公共资源库PyPI的相关资源包的

首先安装easy_install

下载地址:https://pypi.python.org/pypi/ez_setup

解压,安装.

python ez_setup.py

安装好easy_install 之后 再安装pip

下载地址:https://pypi.python.org/pypi/pip

解压,安装.

python setup.py install

~~~~~~~~~~~~~~~

pip install virtualenv

$ mkdir myproject
$ cd myproject
$ virtualenv venv
New python executable in venv/bin/python
Installing distribute............done.

. venv/bin/activate

pip install Flask

要注意相关的前缀哟