PEW- 虚拟环境管理工具

PEW （Python Env Wrapper）是一套管理多个虚拟环境的工具，在bash，zsh，fish和powershell上完美运行。

用法：

~> pew new --python=pypy -i django myproject
Running virtualenv with interpreter /home/dario/Applications/bin/pypy
New pypy executable in myproject/bin/pypy
Installing distribute..................................................................
.......................................................................................
..................................................................done.
Installing pip................done.
Downloading/unpacking django
Downloading Django-1.5.1.tar.gz (8.0MB):
8.0MB downloaded
Running setup.py egg_info for package django

warning: no previously-included files matching '__pycache__' found under directory '*'
warning: no previously-included files matching '*.py[co]' found under directory '*'
Installing collected packages: django
[SNIP]
Successfully installed django Cleaning up...
Launching subshell in virtual environment. Type 'exit' or 'Ctrl+D' to return.