CentOS 7系统自带了python2,不过可以不用2版本,直接使用python3运行python脚本就可以,但是千万别去动系统自带的python2,因为有程序依赖目前的python2环境,比如yum,动了yum就无法运行了,其他有的程序也可能会受影响。明白了上面的,然后就来安装Python3.6:

https://www.bbsmax.com/A/ZOJPOvK2zv/

安装步骤:

1. 安装依赖环境

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

2.下载Python3

  https://www.python.org/downloads/

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

3.安装python3

  包安装在/usr/local/Python3(具体安装位置看个人喜好)
  创建目录:

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# mkdir -p /usr/local/Python3

  解压下载好的Python-3.6.5.tgz包(具体包名因你下载的Python具体版本,我下载的是Python3.6.5这里就以Python-3.6.5.tgz为例)

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# tar -zxvf Python-3.6.5.tgz

4.进入解压后的目录,编译安装

  如果编译安装过程有报错提示看我的另一个随笔写的解决办法http://www.cnblogs.com/shwee/p/9013851.html

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# cd Python-3.6.5
# ./configure --prefix=/usr/local/Python3

  然后:make

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# make

  接着:make install

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# make install

  或者两步一起:make && make install

5.安装好了,建立python3的软链

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# ln -s /usr/local/Python3/bin/python3 /usr/bin/python3

6.并将/usr/local/Python3/bin加入PATH

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# vim ~/.bash_profile
# .bash_profile
# Get the aliases and functions
if -f ~/.bashrc ]; then
. ~/.bashrc
fi
# User specific environment and startup programs
PATH=$PATH:$HOME/bin:/usr/local/Python3/bin
export PATH

  按ESC,输入:wq,按回车保存退出编辑。

  修改完记得执行行下面的命令,让上一步的修改生效:

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# source ~/.bash_profile

  检查Python3及pip3是否正常可用:

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# python3 -V
Python 3.6.5
# pip3 -V
pip 9.0.3 from /usr/local/Python3/lib/python3.6/site-packages (python 3.6)