Tunnel connection failed: 407 Proxy Authentication Required

报错信息 ：

Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', OSError('Tunnel connection failed: 407 Proxy Authentication Required ( Forefront TMG requires authorization to fulfill the request. Access to the Web Proxy filter is denied. )',))': /simple/jupyter/

• 根据报错信息 Cannot connect to proxy判断应该是代理的错误，结合由于使用公司的电脑，所以配置一下代理的环境

set http_proxy=http://username:password@proxyservice:port

tips:对于密码中的特殊字符需要转义，比如@ 变为%40

eg set http_proxy=https://username:pass%40word@hhhhh.com:1080

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