由于yum命令依赖系统的python2.6， 所以如果直接覆盖的话，会导致yum不能工作。 所以自带的python 2.6绝对不能动。 不过可以通过自定义安装来共存两套或多套python环境。 再配合virtualenv 隔离项目环境.
这里演示安装Python2.7 :
首先安装系统依赖包
yum install zlib-devel
yum install bzip2-devel
yum install openssl-devel
yum install ncurses-devel
yum install sqlite-devel
下载Python2.7 源码编译安装
cd /usr/local/src;
wget --no-check-certificate https://www.python.org/ftp/python/2.7.11/Python-2.7.11.tar.xz
tar xf Python-2.7.11.tar.xz
cd Python-2.7.11
./configure --prefix=/usr/local/python27
make && make install
安装pip
使用python27安装pip
wget https://bitbucket.org/pypa/setuptools/raw/bootstrap/ez_setup.py
/usr/local/python27/bin/python ez_setup.py
/usr/local/python27/bin/easy_install pip
到这里python2.7.11 和 pip套件都安装了可以使用了。 下一步就是把/usr/local/python27/bin/ 加入$PATH变量。
安装virtualenvwrapper
这一步实在自带的python2.6 上执行的， 所以如果用python 2.7 需要再创建的虚拟环境的时候指定
pip install virtualenvwrapper
然后再~/.bashrc文件追加以下操作
~/.bashrc or ./zshrc
source $(which virtualenvwrapper.sh)
然后source ~/.bashrc 这样就可以使用workon、 mkvirtualenv、 rmvirtualenv命令.具体的指南参考 virtualenvwrapper
创建基于Python 2.7 的虚拟环境
mkvirtualenv ansible -p /usr/local/python2.7.11/bin/python
错误处理
第一个错误, source $(which virtualenvwrapper.sh)出现logging no NullHandler
Traceback (most recent call last):
File "/usr/lib64/python2.6/runpy.py", line 122, in _run_module_as_main
"__main__", fname, loader, pkg_name)
File "/usr/lib64/python2.6/runpy.py", line 34, in _run_code
exec code in run_globals
File "/usr/lib/python2.6/site-packages/virtualenvwrapper/hook_loader.py", line 16, in <module>
from stevedore import ExtensionManager
File "/usr/lib/python2.6/site-packages/stevedore/__init__.py", line 23, in <module>
LOG.addHandler(logging.NullHandler())
AttributeError: 'module' object has no attribute 'NullHandler'
virtualenvwrapper.sh: There was a problem running the initialization hooks.
If Python could not import the module virtualenvwrapper.hook_loader,
check that virtualenvwrapper has been installed for
VIRTUALENVWRAPPER_PYTHON=/usr/bin/python and that PATH is
处理方法, 升级stevedore
pip install stevedore
python 2.6.6 可以升级到1.3.0 就可以了.
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