Python 2.6升级2.7版本

[root@vip ~]# yum install vim gcc make wget -y
[root@vip ~]# yum install openssl-devel zlib-devel readline-devel sqlite-devel -y

[root@vip ~]# cd /usr/local/src
[root@vip ~]# wget https://www.python.org/ftp/python/2.7.10/Python-2.7.10.tgz

[root@vip ~]# tar -zxvf Python-2.7.10.tgz
[root@vip ~]# ls
Python-2.7.10  Python-2.7.10.tgz

[root@vip ~]# cd Python-2.7.10
[root@vip Python-2.7.10]# ./configure --enable-shared --enable-loadable-sqlite-extensions    --prefix=/usr/local/python27 --with-zlib --with-ssl   --enable-unicode=ucs4

[root@vip Python-2.7.10]# vim ./Modules/Setup    # 找到下边这一行内容，去掉注释
\#zlib zlibmodule.c -I$(prefix)/include -L$(exec_prefix)/lib -lz
[root@vip Python-2.7.10]# make && make install

[root@vip Python-2.7.10]# python -V
Python 2.6.6
# 版本依旧是 2.6.6

[root@vip Python-2.7.10]# cd /usr/bin/
[root@vip bin]# ls python* -l   # 旧 python 版本信息
-rwxr-xr-x. 2 root root 4864 2月  22 2013  python
lrwxrwxrwx. 1 root root    6 10月 22 18:38 python2 -> python
-rwxr-xr-x. 2 root root 4864 2月  22 2013  python2.6
[root@vip bin]# mv /usr/bin/python /usr/bin/python2.6.6
[root@vip bin]# ln -s /usr/local/python27/bin/python2.7 /usr/bin/python
[root@vip bin]# ls python* -l
lrwxrwxrwx. 1 root root   33 10月 23 00:01 python -> /usr/local/python27/bin/python2.7
lrwxrwxrwx. 1 root root    6 10月 22 18:38 python2 -> python
-rwxr-xr-x. 2 root root 4864 2月  22 2013 python2.6
-rwxr-xr-x. 2 root root 4864 2月  22 2013 python2.6.6

[root@vip bin]# python -V
Python 2.7.10
可以看到，系统识别的 python 版本已经是 python 2.7.10

执行 python -V 遇到的问题：

python: error while loading shared libraries: libpython2.7.so.1.0: cannot open shared object file: No such file or directory
\# 原因：linux系统默认没有把/usr/local/python27/lib路径加入动态库搜索路径

[root@vip ~]# vim /etc/ld.so.conf
\# 添加如下一行内容
/usr/local/python27/lib
[root@vip ~]# ldconfig  # 使新添加的路径生效，也可以直接拷贝到python二进制文件能识别的lib库路径下，比如说64系统，则放在/usr/lib64下面即可

[root@vip bin]# yum 
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
 No module named yum

[root@vip bin]# vim /usr/bin/yum
#!/usr/bin/python
# 第一行修改为 python2.6.6
#!/usr/bin/python2.6.6

[root@vip bin]# yum repolist
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile

[root@vip ~]# wget https://bootstrap.pypa.io/get-pip.py
[root@vip ~]# python get-pip.py

[root@vip ~]# ln -s /usr/local/python27/bin/pip2.7 /usr/bin/pip

pip install fabric