安装python环境
方法一：
以root用户运行以下命令
sudo apt update
sudo apt install software-properties-common
将Deadsnakes PPA添加到系统的来源列表中：
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt install python3.9
通过键入以下命令验证安装是否成功：
python3.9 --version
方法二：
sudo apt update
sudo apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev wget
wget https://www.python.org/ftp/python/3.9.4/Python-3.9.4.tgz
tar -zxvf Python-3.9.4.tgz
cd Python-3.9.4/
./configure --enable-optimizations
make -j 9
sudo make altinstall
python3.9 --version