python2.6使用virtualenvwrapper 报错 AttributeError: 'module' object has no attribute 'NullHandler'

服务是centos6,默认python是2.6的。安装完virtualenvwrapper执行source /usr/bin/virtualenvwrapper.sh初始化时出现如下错误:

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.

原因python2.6的loggin模块没有NullHandler.解决方法如下:

修改

/usr/lib/python2.6/site-packages/stevedore/__init__.py

将最后一行的LOG.addHandler(logging.NullHandler())内容改为:

try:
    from logging import NullHandler
except ImportError:
    class NullHandler(logging.Handler):
        def emit(self, record):
            pass
 
LOG.addHandler(NullHandler())

摘抄于该链接：http://www.loonapp.com/blog/48/