谁能帮我解决这个问题

[root@localhost ~]# ipython
Traceback (most recent call last):
File "/usr/bin/ipython", line 4, in <module>
from IPython import start_ipython
File "/usr/local/python27/lib/python2.7/site-packages/IPython/__init__.py", line 48, in <module>
from .core.application import Application
File "/usr/local/python27/lib/python2.7/site-packages/IPython/core/application.py", line 22, in <module>
from traitlets.config.application import Application, catch_config_error
ImportError: No module named traitlets.config.application