centos7安装python3（保留python2.7）

centos7安装python3（保留python2.7）

 # sh脚本更新centos原python为python3.6
# !/bin/bash
#  更新yum
# rpm 强制安装
# rpm  -Uvh  ./*.rpm  --nodeps  --force
yum -y install zlib-devel bzip2-devel libffi-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make wget
install_path=/usr/local/python3
#  下载python
mkdir -p $install_path
cd /tmp
wget -c    https://registry.npmmirror.com/-/binary/python/3.6.9/Python-3.6.9.tar.xz
tar   -xvJf   Python-3.6.9.tar.xz
cd Python-3.6.9
#  编译
./configure prefix=$install_path
make && make install
#  链接
ln -sf   $install_path/bin/python3 /usr/bin/python3
ln -sf   $install_path/bin/pip3 /usr/bin/pip3

#  设置加速 镜像源
mkdir -p ~/.pip
touch ~/.pip/pip.conf
echo "" > pip.conf
echo "[global]" >> pip.conf
echo "index-url = https://pypi.tuna.tsinghua.edu.cn/simple" >> pip.conf
echo "[install]" >> pip.conf
echo "trusted-host=pypi.tuna.tsinghua.edu.cn" >> pip.conf
echo "disable-pip-version-check = true" >> pip.conf
echo "timeout = 6000" >> pip.conf

#echo 'export PATH=  $install_path/bin:$PATH' >> ~/.bashrc
#source ~/.bashrc

python3 -V
pip3 -V