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python2 upgraded to python3

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Release： 2017-07-08 18:13:23
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系统环境centos 6.5
原python版本2.6.6
目标python版本3.5.1
1.下载python3.5
wget --no-check-certificate 
2.解压文件 编译 安装
 tar -xvzf Python-3.3.0.tgz
 cd Python-3.3.0
 ./configure --prefix=/home/python/soft_install/python3.3/
 make
 make install
 进入 安装目录下的bin目录，检查是否安装成功
 ./python3.3 -V ---如果安装成功则会显示安装的版本号
 修改默认的python ，重新建立软链接
 ln -s /home/python/soft_install/python3.3/bin/python3.3 /usr/bin/python

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