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CentOS7保留默认Python版本并安装更新Python2和Python3共存

时间:2017-12-26  来源:未知  作者:admin666

CentOS 7 默认的python版本是python2.7.5。因为yum依赖于默认的python版本的缘由,所以要先保留默认版本,并修改yum文件头部后,才能开始安装更新python2和python3两个最新版本。(python2和python3共存)

一. 保留默认python版本2.7.5,并修改yum头部,保持yum对默认版本python2.7.5的依赖

1.su root  # 获取root权限

2.mv /usr/bin/python2.7 /usr/bin/python2.7.5  # 保留默认版本python为python2.7.5

 ln -s /usr/bin/python2.7.5 /usr/local/bin/python2.7.5  # 创建软连接


3.ll /usr/bin/yum*  # 查看/usr/bin/目录下所有yum文件(7个)头部

4.vi /usr/bin/yum*  # 修改/usr/bin/目录下所有yum文件(7个)头部

  #!/usr/bin/python —> #!/usr/bin/python2.7.5  

5.vi /usr/libexec/urlgrabber-ext-down  # 修改/usr/libexec/目录下 urlgrabber-ext-down头部

  #!/usr/bin/python —> #!/usr/bin/python2.7.5

二. 安装最新版python2.7.13和python3.6.2(python2和python3共存,修改后默认版本为python3.6.2)

准备工作:

1. 安装wget命令(可以在线下载安装包的命令)

  yum -y install wget

2. 准备编译环境

  yum groupinstall 'Development Tools'
  yum install zlib-devel bzip2-devel openssl-devel ncurses-devel
3. 下载并安装最新版本的python2和python3的tgz压缩文件

  https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tgz
  https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tgz

开始安装:

1. 进入下载目录:

  cd /usr/local/src

2. 下载并安装最新版本python2:
  wget https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tgz
  tar zxvf Python-2.7.13.tgz
  cd Python-2.7.13
  ./configure
  make all
  make install
  make clean
  make distclean
  rm -rf /usr/bin/python
  rm -rf /usr/bin/python2
  rm -rf /usr/bin/python2.7
  ln -s /usr/local/bin/python2.7 /usr/bin/python
  ln -s /usr/local/bin/python2.7 /usr/bin/python2
  ln -s /usr/local/bin/python2.7 /usr/bin/python2.7
  /usr/bin/python -V
  /usr/bin/python2 -V
  /usr/bin/python2.7 -V
  rm -rf /usr/local/bin/python
  rm -rf /usr/local/bin/python2
  ln -s /usr/local/bin/python2.7 /usr/local/bin/python
  ln -s /usr/local/bin/python2.7 /usr/local/bin/python2
  python -V
  python2 -V
  python2.7 -V

3. 下载并安装最新版本python3:
  wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tgz
  tar zxvf Python-3.6.2.tgz
  cd Python-3.6.2
  ./configure
  make all
  make install
  make clean
  make distclean
  rm -rf /usr/bin/python
  rm -rf /usr/bin/python3
  rm -rf /usr/bin/python3.6
  ln -s /usr/local/bin/python3.6 /usr/bin/python
  ln -s /usr/local/bin/python3.6 /usr/bin/python3
  ln -s /usr/local/bin/python3.6 /usr/bin/python3.6
  /usr/bin/python -V
  /usr/bin/python3 -V
  /usr/bin/python3.6 -V
  rm -rf /usr/local/bin/python
  rm -rf /usr/local/bin/python3
  ln -s /usr/local/bin/python3.6 /usr/local/bin/python
  ln -s /usr/local/bin/python3.6 /usr/local/bin/python3
  python -V
  python3 -V
  python3.6 -V

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