环境：Mac OS X Yosemite 10.10.3 * * * # 安装Scrapy 学习Python爬虫必须要使用的框架Scrapy，话不多说。 打开终端执行命令： ~~~ sudo easy_install pip ~~~ pip 和 easy_install 都是 Python 的框架管理命令，pip 是对 easy_install的升级。 然后终端执行命令安装 Scrapy： ~~~ sudo pip install Scrapy ~~~ 如果执行成功，那么 Scrapy 就安装成功了，但往往事与愿违，你很有可能遇到如下错误： ~~~ /private/tmp/pip-build-9RYtLC/lxml/src/lxml/includes/etree_defs.h:14:10: fatal error: 'libxml/xmlversion.h' file not found #include "libxml/xmlversion.h" ^ 1 error generated. error: command 'cc' failed with exit status 1 ---------------------------------------- Command "/usr/bin/python -c "import setuptools, tokenize;__file__='/private/tmp/pip-build-9RYtLC/lxml/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-544HZx-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/tmp/pip-build-9RYtLC/lxml ~~~  屏幕快照 2015-04-21 下午1.30.42.png 解决方法有如下几种： 1、终端执行命令安装或更新命令行开发工具： ~~~ xcode-select --install ~~~ 2、配置路径：C_INCLUDE_PATH ~~~ C_INCLUDE_PATH=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/libxml2:/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/libxml2/libxml:/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include ~~~ 3、参照官网使用如下命令安装Scrapy ~~~ STATIC_DEPS=true pip install lxml ~~~ 一般此三个方法就可解决错误成功安装Scrapy，如果还是失败，参考 StackOverflow上的一个帖子 * * * # 安装PIL PIL是Python的图形处理库，在学习爬虫的时候可以用来处理验证码。 终端输入命令： ~~~ sudo pip install pil ~~~ 恩，出错： ~~~ /Library/Python/2.7/site-packages/pip-6.1.1-py2.7.egg/pip/_vendor/requests/packages/urllib3/util/ssl_.py:79: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning. InsecurePlatformWarning Could not find a version that satisfies the requirement pil (from versions: ) Some externally hosted files were ignored as access to them may be unreliable (use --allow-external pil to allow). No matching distribution found for pil ~~~ 不过提示了添加参数 `--allow-external pil` 好，改一下命令重新执行： ~~~ sudo pip install PIL --allow-external PIL ~~~ 好的，开始安装了，哎？好像又出错了！！！ ~~~ _imagingft.c:73:10: fatal error: 'freetype/fterrors.h' file not found #include <freetype/fterrors.h> ^ 1 error generated. error: Setup script exited with error: command 'cc' failed with exit status 1 ~~~ 提示没找到 `freetype/fterrors.h`文件，百度怎么解决，很多文章的解决办法是执行命令：`ln -s /usr/local/include/freetype2 /usr/local/include/freetype` 然后，试了，不行。 从Finder来到目录 `usr/local/include`下，咦？好像有目录freetype2，但是么有freetype，那么...可以复制一个freetype2的副本再改名freetype不行吗？恩，然后我就这样干了。然后在终端重新执行安装PIL的命令： ~~~ sudo pip install PIL --allow-external PIL ~~~ 然后就安装成功了~~ * * * # 安装BeautifulSoup 首先，[官网](https://pypi.python.org/pypi/beautifulsoup4/4.3.2)下载最新的包`beautifulsoup4 4.3.2`，然后解压缩，从终端进入该目录。 终端执行 ~~~ sudo python setup.py install ~~~  屏幕快照 2015-05-23 下午5.26.37.png 好，安装成功。 Beautifulsoup的[官方文档](http://www.crummy.com/software/BeautifulSoup/bs4/doc/index.zh.html) * * * 补充： easy_install使用方法： 安装：`easy_install PackageName` 删除：`easy_install -m PackageName` 更新：`easy_install -U PackageName` pip使用方法： 安装：`pip install PackageName` 删除：`pip uninstall PackageName` 更新：`pip install -U PackageName` 搜索：`pip search PackageName`