Python有两个封装了setuptools的包管理工具：easy_install和pip。目前官方推荐使用pip。
现在，让我们来安装一个第三方库——Python Imaging Library，这是Python下非常强大的处理图像的工具库。一般来说，第三方库都会在Python官方的pypi.python.org网站注册，要安装一个第三方库，必须先知道该库的名称，可以在官网或者pypi上搜索，比如Python Imaging Library的名称叫PIL，因此，安装Python Imaging Library的命令就是：
pip install PIL
出现如下问题：
Traceback (most recent call last): File “/usr/bin/pip-python”, line 5, in <module> from pkg_resources import load_entry_point File “build/bdist.linux-x86_64/egg/pkg_resources.py”, line 2749, in <module> File “build/bdist.linux-x86_64/egg/pkg_resources.py”, line 444, in _build_master File “build/bdist.linux-x86_64/egg/pkg_resources.py”, line 725, in require File “build/bdist.linux-x86_64/egg/pkg_resources.py”, line 628, in resolve pkg_resources.DistributionNotFound: pip==0.8
出现上述错误主要是由于python的版本太过老了，需要下载最新版本的setuptools
无奈之下，只好去安装easy_install并安装。
easy_install PIL
-------------------------------------------------------------------- PIL 1.1.7 SETUP SUMMARY -------------------------------------------------------------------- version 1.1.7 platform linux2 2.7.3 (default, Jul 2 2014, 09:15:41) [GCC 4.8.1] -------------------------------------------------------------------- *** TKINTER support not available --- JPEG support available --- ZLIB (PNG/ZIP) support available --- FREETYPE2 support available *** LITTLECMS support not available -------------------------------------------------------------------- To add a missing option, make sure you have the required library, and set the corresponding ROOT variable in the setup.py script. To check the build, run the selftest.py script. zip_safe flag not set; analyzing archive contents... Image: module references __file__ Adding PIL 1.1.7 to easy-install.pth file Installing pilprint.py script to /usr/local/bin Installing pilfile.py script to /usr/local/bin Installing pilconvert.py script to /usr/local/bin Installing pildriver.py script to /usr/local/bin Installing pilfont.py script to /usr/local/bin Installed /usr/local/lib/python2.7/site-packages/PIL-1.1.7-py2.7-linux-i686.egg Processing dependencies for PIL Finished processing dependencies for PIL