解决‘You are using pip version 20.0.2；however, version 20.1.1 is available.’

无法通过pip更新和安装文件，提示让更新版本

当用anaconda3\python.exe -m pip install --upgrade pip更新时会报出pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host=‘files.pythonhosted.org’, port=443): Read timed out.
连接超时
这样就用
python -m pip install --upgrade pip -i https://pypi.douban.com/simple
这句话就可以更新完成。