升级python

查看默认Python版本
python -V
  
1、安装gcc，用于编译Python源码
    yum install gcc
2、下载源码包，https://www.python.org/ftp/python/
3、解压并进入源码文件
4、编译安装
    ./configure
    make all
    make install
5、查看版本
    /usr/local/bin/python2.7 -V
6、修改默认Python版本
    mv /usr/bin/python /usr/bin/python2.6
    ln -s /usr/local/bin/python2.7 /usr/bin/python
7、防止yum执行异常，修改yum使用的Python版本
    vi /usr/bin/yum
    将头部 #!/usr/bin/python 修改为 #!/usr/bin/python2.6

恢复python版本

[root@node0 ansible]# python -V
Python 2.7.13
[root@node0 ansible]# which python
/usr/local/bin/python
[root@node0 ansible]# whereis python
python: /usr/bin/python2.6-config /usr/bin/python2.6 /usr/bin/python /usr/lib/python2.6 /usr/lib64/python2.6 /usr/local/bin/python2.7-config /usr/local/bin/python2.7 /usr/local/bin/python /usr/local/lib/python2.7 /usr/include/python2.6 /usr/share/man/man1/python.1.gz
[root@node0 ansible]# type python
python is hashed (/usr/local/bin/python)
[root@node0 ansible]# mv /usr/local/bin/python /usr/local/bin/python.old
[root@node0 ansible]# type python
python is hashed (/usr/local/bin/python)
[root@node0 ansible]# hash -r
[root@node0 ansible]# type python
python is /usr/bin/python
[root@node0 ansible]# python -V
Python 2.6.6

安装paramiko

安装包：pycrypto和paramiko(已上传至文件目录)

命令：python setup.py build && python setup.py install

安装第三方包的时候报错

例如：安装第三方MySQL-python时报错：ImportError: No module named setuptools

在安装过程中出现如下错误：

[root@localhost MySQL-python-1.2.5]# python setup.py install

Traceback (most recent call last):

File "setup.py", line 7, in <module>

import setuptools

ImportError: No module named setuptools

ps：字面意思是：没有setuptools的模块，说明python缺少这个模块；

解决方法如下：

下载setuptools包

# wget http://pypi.python.org/packages/source/s/setuptools/setuptools-0.6c11.tar.gz

解压setuptools包

# tar -xvf setuptools-0.6c11.tar.gz

# cd setuptools-0.6c11

编译setuptools

# python setup.py build

开始执行setuptools安装

# python setup.py install

tab补全

context：CentOS 6.5 ,python2.7

[root@node1 ~]# cat /usr/local/lib/python2.7/site-packages/tab.py
#python startup file
import sys
import readline
import rlcompleter
import atexit
import os
# tab completion
readline.parse_and_bind('tab: complete')