python315._pth
import site

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python get-pip.py
python -m pip install dnspython

curl -x http://127.0.0.1:1080 https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python get-pip.py --proxy="http://127.0.0.1:1080"
python -m pip install dnspython -i https://mirrors.aliyun.com/pypi/simple