centos7系统安装py3

#!/bin/bash


# centos7安装python3
cd /usr/local/src
wget https://www.python.org/ftp/python/3.7.8/Python-3.7.8.tgz
tar -zxf Python-3.7.8.tgz -C /usr/local
ln -s /usr/local/Python-3.7.8  /usr/local/python

# 安装依赖包
yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make libffi-devel

cd /usr/local/python
./configure && make && make install

# 修改默认的python2.7 和 pip
mv /usr/bin/python python.bak
ln -s /usr/local/bin/python3 /usr/bin/python
ln -s /usr/local/bin/pip3 /usr/bin/pip

# 修改yum默认依赖的python2环境
# yum是依赖python2.7的，你把python改成了3.7了，自然不好使了。
# 但是不用担心，python2.7还在你的系统里。只要修改一下yum里的相关依赖即可

sed -i 's|\/usr\/bin\/python|\/usr\/bin\/python2.7|g' /usr/libexec/urlgrabber-ext-down
sed -i 's|\/usr\/bin\/python|\/usr\/bin\/python2.7|g' /usr/bin/yum

# 验证python环境
python -V

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