转载链接：http://huanyouchen.github.io/2019/11/21/pip-install-package-very-slow/
问题描述
使用pip安装seaborn提示：
sudo python3.5 -m pip install seabornCollecting seabornWARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x7fb25d444fd0>: Failed to establish a new connection: [Errno 101] 网络不可达',)': /packages/a8/76/220ba4420459d9c4c9c9587c6ce607bf56c25b3d3d2de62056efe482dadc/seaborn-0.9.0-py3-none-any.whl
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尝试加入default-time=100这个参数，提示：
sudo python3.5 -m pip --default-time=100 install seabornCollecting seabornWARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out. (read timeout=100.0)",)': /packages/a8/76/220ba4420459d9c4c9c9587c6ce607bf56c25b3d3d2de62056efe482dadc/seaborn-0.9.0-py3-none-any.whl
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等了半天还是安装不了
解决方法
在pip后面加入-i参数，比如：-i https://pypi.tuna.tsinghua.edu.cn/simple
sudo python3.5 -m pip --default-time=100 install seaborn -i https://pypi.tuna.tsinghua.edu.cn/s
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另外，可以将默认时间延迟增大避免超时
--default-timeout=10000 -i https://pypi.tuna.tsinghua.edu.cn/simple
pip install tensorflow --default-timeout=10000 -i https://pypi.doubanio.com/simple/
下载的飞快～
据说可以一劳永逸的方法，但我还没试过，过程如下：
mkdir ~/.pip
cd ~/.pip
touch pip.conf
gedit pip.conf[global]
index-url = http://pypi.douban.com/simple
[install]
trusted-host = pypi.douban.comcat pip.conf
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