python版本升级流程，升级2.7跟3.x版本流程一样

前言：

　　目前python2.6版本很多库已经不支持，在安装库的时候总会遇到很多装不上的事故，特别烦恼，所以以后不纠结，直接升级python版本后再使用，避免多次采坑；当然，未来趋势还是python3.xxx版本，允许条件下，新环境还是用python3.0版本以上比较稳妥。

1.其中一个错误，运行django项目时报错：缺少sqlite3，下面编译需要先安装sqlite3

django.core.exceptions.ImproperlyConfigured: Error loading either pysqlite2 or sqlite3 modules (tried in that order): No module named '_sqlite3'

2.安装Python依赖包：

yum install libffi-devel zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite sqlite-devel readline-devel tk-devel gcc make python-devel libxslt-devel gpgme-devel -y

3.编译安装python

./configure --prefix=/usr/local/python2.
make
make install

4.安装setuptools

/usr/local/python2./bin/python setup.py install

5.安装pip

/usr/local/python2./bin/python setup.py install

6.配置环境变量【可以选择不配置】

vim /etc/profile

ulimit -n
PATH=/usr/local/python2./bin:$PATH
PATH=/usr/local/python2./lib/python2./site-packages/django/bin:$PATH

source /etc/profile

7.检查版本

pip -V

pip 19.1. from /usr/local/python2./lib/python2./site-packages/pip-19.1.-py2..egg/pip (python 2.7)

python

Python 2.7. (default, Aug  , ::)
[GCC 4.4.  (Red Hat 4.4.-)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>