centos7安装Python3

1、安装前准备

centos7系统自带了Python2，而且这个Python2不能被删除，因为有很多系统命令，比如yum都要用到。

[root@test1 demos]# python --version
Python 2.7.5

[root@test1 demos]# which python
/usr/bin/python

下面安装Python3 ：

首先安装依赖包：

yum -y groupinstall "Development tools"
yum -y install libffi-devel gcc gcc-c++ zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel

2、安装

#下载安装包

wget https://www.python.org/ftp/python/3.6.5/Python-3.6.5.tar.xz

#创建一个安装目录
mkdir /usr/local/python3

#解压压缩包，进入该解压出的目录，并编译安装Python3
tar -xJf  Python-3.6.5.tar.xz

cd Python-3.6.5

./configure --prefix=/usr/local/python3

make && make install

3、为命令创建软链接

[root@test1 Python-3.6.5]# cd /usr/local/python3/

[root@test1 python3]# ls bin/
2to3              idle3    pip3.6    python3           python3.6m         pyvenv
2to3-3.6          idle3.6  pydoc3    python3.6         python3.6m-config  pyvenv-3.6
easy_install-3.6  pip3     pydoc3.6  python3.6-config  python3-config

[root@test1 python3]# ln -s /usr/local/python3/bin/python3 /usr/bin/python3

[root@test1 python3]# ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3

[root@test1 python3]# python3 --version
Python 3.6.5