Jupyter笔记本：导入错误：无法导入名称“default”

Question

当试图用命令Jupyter笔记本开始Jupyter，我收到此错误如下：

File "/anaconda/bin/jupyter-notebook", line 4, in <module> 
import notebook.notebookapp 
File "/anaconda/lib/python3.6/site-packages/notebook/notebookapp.py", 
line 63, in <module> 
from .services.contents.manager import ContentsManager 
File "/anaconda/lib/python3.6/site- 
packages/notebook/services/contents/manager.py", line 16, in <module> 
from nbformat import sign, validate, ValidationError 
File "/anaconda/lib/python3.6/site-packages/nbformat/sign.py", line 24, 
in <module> 
from traitlets import (
ImportError: cannot import name 'default' 

任何想法，缺什么？

Answer 1

我卸载traitlets包并重新安装它。问题消失了。不知道它是如何打破的。