安装
1. 使用 apt 安装：
$ sudo apt-get install python-pip
截止本文落笔，apt 安装 pip 版本为 1.0，但 pip 最新发行版本为 1.5.6
$ pip --version pip 1.0 from /usr/lib/python2.7/dist-packages (python 2.7)
pip 1.0 特性：
$ pip -h Usage: pip COMMAND [OPTIONS] Options: --version show program's version number and exit -h, --help Show help -E DIR, --environment=DIR virtualenv environment to run pip in (either give the interpreter or the environment base directory) -s, --enable-site-packages Include site-packages in virtualenv if one is to be created. Ignored if --environment is not used or the virtualenv already exists. -v, --verbose Give more output -q, --quiet Give less output --log=FILENAME Log file where a complete (maximum verbosity) record will be kept --proxy=PROXY Specify a proxy in the form user:passwd@proxy.server:port. Note that the user:password@ is optional and required only if you are behind an authenticated proxy. If you provide user@proxy.server:port then you will be prompted for a password. --timeout=SECONDS, --default-timeout=SECONDS Set the socket timeout (default 15 seconds) Commands available: bundle: Create pybundles (archives containing multiple packages) freeze: Output all currently installed packages (exact versions) to stdout help: Show available commands install: Install packages search: Search PyPI uninstall: Uninstall packages unzip: Unzip individual packages zip: Zip individual packages