CentOS 7 安装 Python3

现有的 python2

[root /]# whereis python
python: /usr/bin/python /usr/bin/python2.7 /usr/bin/python.bak /usr/lib/python2.7 /usr/lib64/python2.7 /etc/python /usr/include/python2.7 /usr/share/man/man1/python.1.gz

[root bin]# ll python*
lrwxrwxrwx. 1 root root    9 5月  27 2016 python2 -> python2.7
-rwxr-xr-x. 1 root root 7136 11月 20 2015 python2.7
lrwxrwxrwx. 1 root root    7 5月  27 2016 python.bak -> python2

安装编译 Python3的相关包

yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make libffi-devel

安装 pip

#运行这个命令添加epel扩展源 
yum -y install epel-release 
#安装pip 
yum install python-pip

安装 wget

pip install wget

下载 python3.7的源码包

wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tgz
#解压缩
tar -zxvf Python-3.7.0.tgz

#进入解压后的目录，依次执行下面命令进行手动编译
./configure prefix=/usr/local/python3 
make && make install

如果最后没提示出错，就代表正确安装了，在/usr/local/目录下就会有python3目录

添加软链接

#添加python3的软链接 
ln -s /usr/local/python3/bin/python3.7 /usr/bin/python3
#添加 pip3 的软链接 
ln -s /usr/local/python3/bin/pip3.7 /usr/bin/pip3
#测试是否安装成功了 
python -V