Quickly install python 3.9.9 without affecting the original python environment
yum install gcc patch libffi-devel python-devel zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel libffi-devel uuid uuid-devel -y
mkdir /usr/local/python3
cd /tmp
wget https://www.python.org/ftp/python/3.9.9/Python-3.9.9.tgz
tar -xf Python-3.9.9.tgz
cd Python-3.9.9
./configure --prefix=/usr/local/python3
make -j`grep -c process /proc/cpuinfo`
make install
echo "PATH=/usr/local/python3/bin:\$PATH" >> /etc/profile
source /etc/profile
/usr/local/python3/bin/python3 -V
python3 -V