Centos7将python2升级为python3

1、安装各种依赖

yum install make gcc gcc-c++
yum install libffi-devel -y
yum -y install zlib*

2、下载Python3.7.8并安装

mkdir python
wget https://www.python.org/ftp/python/3.9.9/Python-3.9.9.tgz
tar -xvf Python-3.9.9.tgz
cd Python-3.9.9
./configure --with-ssl
make
make install

3、python3默认安装到这个目录的

/usr/local/bin/

4、删除老的软连接配置新的软连接

cd /usr/bin/
rm -f python2
mv python python2.6.ori
ln -s python2.7 python2
ln -s /usr/local/bin/python3 /usr/bin/python

5、这样Python就安装好了

python -V
python2 -V
python3 -V

6、下面是修改yum防止yum安装使用有误

vi /usr/bin/yum
vi /usr/libexec/urlgrabber-ext-down

改为：