pip升级失败Failed to establish a new connection: [Errno -2] Name or service not known‘)‘: /simple/pip3/时间：2024-03-14 09:14:56pip无法升级，提示如下： 测试外网连通性，发现虽然能ping通114.114.114.114，但是无法连接外网 解决办法：添加DNS 测试外网连通性，连接正常 再次升级pip，pip升级成功 查看pip升级后的版本
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