pip install py-stringsimjoin error: INCLUDE environment variable is empty

　　在用pip install py-stringsimjoin的时候报错error: INCLUDE environment variable is empty，后来在网上搜索下了说是需要下载安装VCForPython27.msi，

　　下载后安装后VCForPython27.msi（下载地址：https://www.microsoft.com/en-us/download/confirmation.aspx?id=44266），重新安装pip install py-stringsimjoin果然成功