解决Python3 安装Scrapy报 error: Microsoft Visual C++ 14.0 is required

问题：win7 使用pip 安装Scrapy时，报如下错误 building ‘twisted.test.raiser’ extension error: Microsoft Visual C++ 14.0 is required. Get it with “Microsoft Visual C++ Build Tools”: http://landinghub.visualstudio.com/

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