正文
1）下载ubuntu镜像
docker pull ubuntu
2）查看镜像
docker images
3）运行容器
docker run -itd --name ubuntu-test ubuntu
4）进入容器
sudo docker exec -it ubuntu-test /bin/bash
5）更新源
apt-get update
如果不进行这一步的话，有可能会出现这样的问题：
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package Python
运行一次即可
6）安装python3
apt-get install python3
7）安装pip3
apt-get install python3-pip
8）测试
pip3 install numpy Collecting numpy Downloading numpy-1.20.1-cp38-cp38-manylinux2010_x86_64.whl (15.4 MB) |████████████████████████████████| 15.4 MB 1.9 MB/s Installing collected packages: numpy Successfully installed numpy-1.20.1