fedora(linux)切换python版本

yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel

wget https://www.python.org/ftp/python/3.6.8/Python-3.6.8.tgz
tar -xvf Python-3.6.8.tgz
cd /opt/python-3.6.8
./configure --prefix=/opt/python3
make && make install

#配置python3软连接
ln -s /opt/python3/bin/python3 /usr/bin/python3
#配置pip3软连接
ln -s /opt/python3/bin/pip3 /usr/bin/pip3
#升级pip
pip3 install --upgrade pip