解决error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools"

error: Microsoft Visual C++ 14.0 is required. Get it with “Microsoft Visual C++ Build Tools”: 参考：https://blog.csdn.net/weixin_38917807/article/details/81675233 安装一些库是出现问题。比如： pip install gevent 时出错。 输

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