nosetests 报错：pkg_resources.DistributionNotFound: nose==0.10.4

Python新手，运行nosetests出现下列信息，该如何解决？

Traceback (most recent call last):
File "/usr/bin/nosetests", line 5, in <module>
from pkg_resources import load_entry_point
File "/usr/local/python27/lib/python2.7/site-packages/pkg_resources.py", line 2872, in <module>
working_set = WorkingSet._build_master()
File "/usr/local/python27/lib/python2.7/site-packages/pkg_resources.py", line 451, in _build_master
return cls._build_from_requirements(__requires__)
File "/usr/local/python27/lib/python2.7/site-packages/pkg_resources.py", line 464, in _build_from_requirements
dists = ws.resolve(reqs, Environment())
File "/usr/local/python27/lib/python2.7/site-packages/pkg_resources.py", line 639, in resolve
raise DistributionNotFound(req)
pkg_resources.DistributionNotFound: nose==0.10.4

---

你的/usr/bin/nosetests的内容现在是这样的：

   #!/usr/bin/python
    # EASY-INSTALL-ENTRY-SCRIPT: 'nose==0.10.4','console_scripts','nosetests'

__requires__ = 'nose==0.10.4'
import sys
from pkg_resources import load_entry_point

if __name__ == '__main__':
    sys.exit(
        load_entry_point('nose==0.10.4', 'console_scripts', 'nosetests')()
    )

把里面所有的nose==0.10.4改为你机器上现在安装上的nose版本，比如我的安装的1.3.4就把所有的 nose==0.10.4——> nose==1.3.4