更新 Debian (Jessie) 后，pytest 无法工作：
#py.test
Traceback (most recent call last):
File "/usr/bin/py.test", line 5, in <module>
sys.exit(load_entry_point('pytest==2.4.2', 'console_scripts', 'py.test')())
File "/usr/local/lib/python2.7/dist-packages/pkg_resources.py", line 348, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/usr/local/lib/python2.7/dist-packages/pkg_resources.py", line 2311, in load_entry_point
return ep.load()
File "/usr/local/lib/python2.7/dist-packages/pkg_resources.py", line 2024, in load
if require: self.require(env, installer)
File "/usr/local/lib/python2.7/dist-packages/pkg_resources.py", line 2037, in require
working_set.resolve(self.dist.requires(self.extras),env,installer)))
File "/usr/local/lib/python2.7/dist-packages/pkg_resources.py", line 571, in resolve
raise VersionConflict(dist,req) # XXX put more info here
pkg_resources.VersionConflict: (py 1.4.15 (/usr/lib/python2.7/dist-packages), Requirement.parse('py>=1.4.17'))
我该如何修复这个错误？提前致谢！
文件在/usr/local/lib/python2.7/dist-packages属于您使用 pip、easy_install 或 安装的 python 软件包python setup.py。系统更新可能会弄乱一些依赖项。这有效吗？
sudo apt-get install python-pip
sudo /usr/bin/pip install -U pytest
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