Install python and pip

RUN apt-get update
RUN apt-get install -y python3.5  
RUN apt-get install -y python3-pip 

Update pip to latest

RUN pip3 install pip -U

Config mirror settings

RUN pip3 config set global.index-url http://mirrors.aliyun.com/pypi/simple
RUN pip3 config set install.trusted-host mirrors.aliyun.com

If you want to use other mirror resources, simply replace the url after index-url