centos安装python2.7

一般centos系统自带的Python是2.6.6版本，由于版本太老有些好用的模块及功能需要Python2.7才支持。简单写一下如何升级Python2.6到Python2.7并能同步使用pip，以及通过pip安装Django。踩过不少坑，总结了下，按下面步骤逐步安装不然会有报错。

1、安装openssl openssl-devel

如果没安装后面用pip安装软件包的时候可能会提示错误“pip is configured with locations that require TLS/SSL, however the ssl module in Python is not avail”

yum -y openssl openssl-devel

2、安装Python2.7

wget https://www.python.org/ftp/python/2.7.10/Python-2.7.10.tgz

tar -zxvf Python-2.7.10.tgz

cd Python-2.7.10

vim Modules/Setup.dist

将以下四行前面的注释（#）去掉，然后保存退出。该步骤配合步骤1安装ssl模块

SSL=/usr/local/ssl

_ssl _ssl.c

-DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl

-L$(SSL)/lib -lssl -lcrypto

然后

./configure  --prefix=/usr/local/python27

make&&make install

mv /usr/bin/python /usr/bin/python2.6.6  

ln -s /usr/local/Python2.7/bin/python2.7 /usr/bin/python

vim /usr/bin/yum  修改第一行python为python2.6，保证yum能继续使用

3、安装setuptools

yum -y install zlib zlib-devel 

cd Python-2.7.10

make&&make install  （重新编译python）

下载setuptools:wget https://pypi.python.org/packages/a9/23/720c7558ba6ad3e0f5ad01e0d6ea2288b486da32f053c73e259f7c392042/setuptools-36.0.1.zip#md5=430eb106788183eefe9f444a300007f0

unzip setuptools-36.0.1.zip

cd setuptools-2.0

python setup.py install

4、安装pip

下载pip:wget https://pypi.python.org/packages/11/b6/abcb525026a4be042b486df43905d6893fb04f05aac21c32c638e939e447/pip-9.0.1.tar.gz#md5=35f01da33009719497f01a4ba69d63c9

tar -zxvf pip-9.0.1.tar.gz

cd pip-9.0.1

python setup.py install

ln -s /usr/local/python27/bin/pip /usr/bin/pip

5、安装MySQLdb（用Python操作数据库的一个模块）

yum install -y MySQL-python #先安装2.6版本的MySQLdb

把2.6包下的MySQLdb相关文件copy到2.7的包目录下

cp -r /usr/lib64/python2.6/site-packages/MySQLdb /usr/local/python27/lib/python2.7/site-packages/

cp -r /usr/lib64/python2.6/site-packages/_mysql* /usr/local/python27/lib/python2.7/site-packages/

6、安装Django

pip install Django