在Windows7x64下使用pip安装包的时候提示报错:
error: Microsoft Visual C++ 9.0 is required (Unable to find vcvarsall.bat). Get it from https://aka.ms/vcpython27error: Micr
阅读背景：
Windows下pip安装包报错：error: Microsoft Visual C++ 9.0 is required (Unable to find vcvarsall.bat)
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