路易吉:一步一步的指示不起作用

我是python的新手,我已经在我的RHEL linux上安装了Luigi-2.0.1.试图运行示例程序

import luigi

class MyTask(luigi.Task) :
        param = luigi.Parameter(default=42)

        def requires(self):
                return SomeOtherTask(self.param)

        def run(self):
                f = self.output.open('w')
                print >>f, 'hello world'
                f.close()

        def output(self):
                return luigi.LocalTarget('/tmp/foo/bar-%s.txt' % self.param)

if __name__ == '__main__':
        luigi.run()

执行以下命令

luigi --module maintask.py MyTask

我收到以下错误.

Traceback (most recent call last):
  File "/usr/bin/luigi", line 5, in 
    from pkg_resources import load_entry_point
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 2655, in 
    working_set.require(__requires__)
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 648, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 546, in resolve
    raise DistributionNotFound(req)
pkg_resources.DistributionNotFound: python-daemon<3.0

在调查网络时,我无法弄清楚为什么会这样.我有python 2.6.这是luigi与2.6兼容并且仅适用于python 3.0以上吗？

感谢任何帮助

来自Luigi的包装页面:

Luigi是一个Python(2.7,3.3,3.4)软件包,可帮助您构建批处理作业的复杂管道.

如果要使用此功能,则必须从2.6升级.