Proxy error when install

'Connection reset by peer'))': /simple/matplotlib/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(54, 'Connection reset by peer'))': /simple/matplotlib/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(54, 'Connection reset by peer'))': /simple/matplotlib/

网络不好，换个 VPN 节点。