Centos7 python2升级成python3 搭建python开发环境

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Centos7 默认安装python2。升级成python3要进行下边步骤

1、用yum 安装系统环境

yum -y install zlib zlib-devel
yum -y install bzip2 bzip2-devel
yum -y install ncurses ncurses-devel
yum -y install readline readline-devel
yum -y install openssl openssl-devel
yum -y install openssl-static
yum -y install xz lzma xz-devel
yum -y install sqlite sqlite-devel
yum -y install gdbm gdbm-devel
yum -y install tk tk-devel
yum -y install gcc

2、下载Python3.65的安装包（源码）

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

3、解压、编译Python3.65的源码并安装

tar -zxvf Python-3.6.5.tgz  
cd Python-3.6.5/
./configure --prefix=/usr/local/python3
make
make install

4、建立python命令的软链接

cd /usr/bin/
ln -s /usr/local/python3/bin/python3.6 python

命令行输入python，完成python安装

5、修改yum配置（yum依赖python2）

 vi /usr/bin/yum 
把#! /usr/bin/python修改为#! /usr/bin/python2

6、安装setuptools及pip

yum install -y setuptool
yum install -y python-pip

7、修改环境变量

编辑环境变量

vim /etc/profile

增加以下内容

export PYTHONPATH=/usr/local/lib/python3.6/site-packages:/usr/local/python3/lib/python3.6/site-packages:/usr/local/lib64/python3.6/site-packages:$PYTHONPATH

让环境变量生效

source /etc/profile

至此python的升级，及python基础的安装

8、其他常见问题

1、/usr/libexec/urlgrabber-ext-down", line 28

    

vim /usr/libexec/urlgrabber-ext-down
将"#!/usr/bin/python" 改为 "#!/usr/bin/python2"

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