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scrapy是python爬虫中，比较常用的一种框架。

提示异常：

Mac上安装的时候，报错"error: command 'clang' failed with exit status 1"。

songrenqingdeMacBook-Pro:~ songrenqing$ pip install scrapyCollecting scrapy  Using cached https://files.pythonhosted.org/packages/db/9c/cb15b2dc6003a805afd21b9b396e0e965800765b51da72fe17cf340b9be2/Scrapy-1.5.0-py2.py3-none-any.whl...    xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun    error: command 'clang' failed with exit status 1

异常原因：

Mac的OSX系统的C语言，编译器用的是Clang。既然报错与clang有关，应该是xcode command tools出现问题，网上搜了一下其它文章，大部分人也都是通过更新安装xcode解决的。

songrenqingdeMacBook-Pro:~ songrenqing$ gcc --versionConfigured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1Apple LLVM version 9.1.0 (clang-902.0.39.2)

解决办法：

执行 xcode-select --install 命令后，重新安装 

songrenqingdeMacBook-Pro:~ songrenqing$ xcode-select --installxcode-select: note: install requested for command line developer toolssongrenqingdeMacBook-Pro:~ songrenqing$ pip install scrapy......Successfully installed Twisted-18.4.0 scrapy-1.5.0

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