安装selenium 遇到错误

安装selenium   pip install -U selenium

如果出现以下错误：

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x000001AA5A370610>, 'Connection to pypi.org timed out. (connect timeout=15)')': /simple/selenium/

 

解决方案，如下：

pip install web.py -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

 

如果运行之后出现以下错误：

WARNING: You are using pip version 19.2.3, however version 20.0.2 is available.

You should consider upgrading via the 'python -m pip install --upgrade pip' command.

这是因为服务器连接超时，可以使用以下代码解决:

python -m pip install --upgrade pip -i https://pypi.douban.com/simple