Jupyter Notebook：ImportError：无法导入名称＆＃39;默认＆＃39;

Question

当尝试使用命令Jupyter Notebook启动Jupyter时，我收到以下错误：

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'

知道缺少什么吗？

Answer 1

我卸载了traitlets包并重新安装了它。问题消失了。不知道它是如何破裂的。

Answer 2

我使用：
pip3 install --user --upgrade traitlets

对我来说很好。