https://blog.csdn.net/zhi_neng/article/details/78994205
近日，在安装Scrapy的时候提示出现了如下的错误信息：
Scrapy安装错误：Setup script exited with error: Microsoft Visual C++ 14.0 is required. Get it with “Microsoft Visual C++ Build Tools”: http://landinghub.visualstudio.com/visual-cpp-build-tools
导致Scrapy没有安装成功，安装的环境是：当前环境win7，python_3.6.1，64位。windows环境下，在cmd中运行pip install Scrapy报错。往上面查询安装的情况显示的是：
Best match: Twisted 17.9.0
Processing Twisted-17.9.0.tar.bz2
Writing C:\Users\ghr\AppData\Local\Temp\easy_install-q6ar7s9q\Twisted-17.9.0\setup.cfg
Running Twisted-17.9.0\setup.py -q bdist_egg --dist-dir C:\Users\ghr\AppData\Local\Temp\easy_install-q6ar7s9q\Twisted-17.9.0\egg-dist-tmp-d7wibfjn
warning: no previously-included files matching ‘.misc’ found under directory ‘src\twisted’
warning: no previously-included files matching '.bugfix’ found under directory’src\twisted’
warning: no previously-included files matching ‘.doc’ found under directory ‘src\twisted’
warning: no previously-included files matching '.feature’ found under directory ‘src\twisted’
warning: no previously-included files matching ‘.removal’ found under directory’src\twisted’
warning: no previously-included files matching ‘NEWS’ found under directory ‘src\twisted’
warning: no previously-included files matching ‘README’ found under directory ‘src\twisted’
warning: no previously-included files matching ‘newsfragments’ found under directory ‘src\twisted’
warning: no previously-included files found matching ‘src\twisted\topfiles\CREDITS’
warning: no previously-included files found matching ‘src\twisted\topfiles\ChangeLog.Old’
warning: no previously-included files found matching ‘pyproject.toml’
warning: no previously-included files found matching ‘codecov.yml’
warning: no previously-included files found matching ‘appveyor.yml’
no previously-included directories found matching ‘bin’
no previously-included directories found matching ‘admin’
no previously-included directories found matching ‘.travis’
warning: no previously-included files found matching ‘docs\historic\2003’
warning: no previously-included files matching '’ found under directory ‘docs\historic\2003’
显然是Twisted 17.9.0没有安装成功导致的
解决办法：http://www.lfd.uci.edu/~gohlke/pythonlibs/#twisted 下载twisted对应版本的whl文件（如我的Twisted‑17.9.0‑cp36‑cp36m‑win_amd64.whl），cp后面是python版本，amd64代表64位，运行命令：
pip install F:\AI\python\Twisted-17.9.0-cp36-cp36m-win_amd64.whl
install后面为下载的whl文件的完整路径名,安装成功后提示：Successfully installed Twisted-17.9.0
运行下面命令：pip install Scrapy
出现：Installing collected packages: pyasn1, pyasn1-modules
Successfully installed pyasn1-0.4.2 pyasn1-modules-0.2.1 安装成功，在cmd命令行输入scrapy出现如下：