备注：在你使用的集群上都要做部署我这里默认bigdata241节点（检查节点上是否有git，没有的话yum下载）

CentOS7 默认已经安装了Python2.7.5

[root@bigdata241~]# python --version

Python 2.7.5

[root@bigdata241 ~]# which python

/usr/bin/python

[root@bigdata241 ~]#

CentOS7默认安装的Python2不能删除，因为有很多系统命令，比如yum都要用到。输

 

安装python3的方法（root 用户下）

(1).安装编译python需要的组件

# yum -y groupinstall "Development tools"

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

手动下载安装sqlite-devel

# wget http://mirror.centos.org/centos/7/os/x86_64/Packages/sqlite-devel-3.7.17-8.el7.x86_64.rpm

# rpm -ivh sqlite-devel-3.7.17-8.el7.x86_64.rpm

在命令行下输入sqlite3如果可以看到如下信息，则说明安装成功，输入.quit退出

[root@bigdata241~]# sqlite3

SQLite version 3.7.17 2013-05-20 00:56:22

Enter ".help" for instructions

Enter SQL statements terminated with a ";"

sqlite> .quit 退出

(2).下载解压

# mkdir /usr/local/python3

# cd /usr/local/python3

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

# tar -xvJf Python-3.6.5.tar.xz

(3). 编译安装

# cd Python-3.6.5

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

# make && make install

说明：–prefix 后面指定安装目录，即刚刚创建的目录，笔者的是/usr/local/python3

然后创建软连接

# ln -s /usr/local/python3/bin/python3 /usr/bin/python3

# ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3

(4).命令行输入python python3测试

[root@bigdata241 Python-3.6.5]# python

Python 2.7.5 (default, Jul 13 2018, 13:06:57)

[GCC 4.8.5 20150623 (Red Hat 4.8.5-28)] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> exit()

[root@bigdata241 Python-3.6.5]#

注意：在编写python脚本时，注意python解释器的路径，python2为 #!/usr/bin/python，python3为#!/usr/bin/python3