deepin20安装pip3

下载setuptool源码，给python3安装

https://pypi.org/project/setuptools/#files

cd setuptools-50.3.2
sudo python3 setup.py build
sudo python3 setup.py install

下载pip源码

https://pypi.org/project/pip/#files

4. 解压后进入目录，并开始build和安装

cd pip-20.3.1
sudo python setup.py build
sudo python setup.py install