问题: ubuntu下如何安装python3.9
解决: 使用安装包安装
方法:
sudo apt install -y wget build-essential libreadline-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev libffi-dev zlib1g-dev
wget https://www.python.org/ftp/python/3.9.0/Python-3.9.0b4.tgz
tar -zxvf Python-3.9.0b4.tgz