ImportError: cannot import name 'default'

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Arvind Kandaswamy

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Mar 31, 2017, 8:37:52 PM3/31/17

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When trying to start Jupyter with the command Jupyter Notebook, I am getting this below error:

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'

Any idea what is missing?

Paul Hobson

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Apr 1, 2017, 10:09:20 AM4/1/17

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How exactly did you install jupyter notebook?

what are the output of "conda list", "conda info -e", and "which python"?

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Arvind Kandaswamy

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Apr 1, 2017, 10:17:02 AM4/1/17

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I installed jupyter notebook as part of anaconda. After running into issues, I uninstalled jupyter and reinstalled. Still the same issue. Here is the output:

# packages in environment at /anaconda:

_license 1.1 py36_1

alabaster 0.7.9 py36_0

anaconda custom py36_0

anaconda-clean 1.1.0 py36_0

anaconda-client 1.6.0 py36_0

anaconda-navigator 1.5.1 py36_0

anaconda-project 0.4.1 py36_0

appnope 0.1.0 py36_0

appscript 1.0.1 py36_0

astroid 1.4.9 py36_0

astropy 1.3 np111py36_0

awscli 1.11.68 <pip>

babel 2.3.4 py36_0

backports 1.0 py36_0

beautifulsoup4 4.5.3 py36_0

bitarray 0.8.1 py36_0

blaze 0.10.1 py36_0

bokeh 0.12.4 py36_0

boto 2.45.0 py36_0

boto 2.46.1 <pip>

boto3 1.4.4 <pip>

botocore 1.5.31 <pip>

bottleneck 1.2.0 np111py36_0

bz2file 0.98 <pip>

cffi 1.9.1 py36_0

chardet 2.3.0 py36_0

chest 0.2.3 py36_0

click 6.7 py36_0

cloudpickle 0.2.2 py36_0

clyent 1.2.2 py36_0

colorama 0.3.7 py36_0

conda 4.3.15 py36_0

conda-env 2.6.0 0

configobj 5.0.6 py36_0

contextlib2 0.5.4 py36_0

cryptography 1.7.1 py36_0

curl 7.52.1 0

cycler 0.10.0 py36_0

cython 0.25.2 py36_0

cytoolz 0.8.2 py36_0

dask 0.13.0 py36_0

datashape 0.5.4 py36_0

decorator 4.0.11 py36_0

decorator 4.0.2 <pip>

dill 0.2.5 py36_0

docutils 0.13.1 py36_0

docutils 0.12 <pip>

entrypoints 0.2.2 py36_0

et_xmlfile 1.0.1 py36_0

fastcache 1.0.2 py36_1

flask 0.12 py36_0

flask-cors 3.0.2 py36_0

freetype 2.5.5 2

get_terminal_size 1.0.0 py36_0

gevent 1.2.1 py36_0

gnureadline 6.3.3 <pip>

greenlet 0.4.11 py36_0

h5py 2.6.0 np111py36_2

hdf5 1.8.17 1

heapdict 1.0.0 py36_1

icu 54.1 0

idna 2.2 py36_0

imagesize 0.7.1 py36_0

ipykernel 4.5.2 py36_0

ipython 4.0.0 <pip>

ipython 5.1.0 py36_1

ipython_genutils 0.1.0 py36_0

ipywidgets 5.2.2 py36_1

isort 4.2.5 py36_0

itsdangerous 0.24 py36_0

jbig 2.1 0

jdcal 1.3 py36_0

jedi 0.9.0 py36_1

jfx-util-api 0.0.2 <pip>

jfx-util-aws 0.0.2 <pip>

jfx-util-logging 0.0.1 <pip>

jfx-util-okta 0.0.1 <pip>

jfx-util-spark 0.0.1 <pip>

jinja2 2.9.4 py36_0

jmespath 0.8.0 <pip>

jpeg 9b 0

jsonschema 2.5.1 py36_0

jupyter 1.0.0 py36_3

jupyter_client 4.4.0 py36_0

jupyter_console 5.0.0 py36_0

jupyter_core 4.2.1 py36_0

lazy-object-proxy 1.2.2 py36_0

libiconv 1.14 0

libpng 1.6.27 0

libtiff 4.0.6 3

libxml2 2.9.4 0

libxslt 1.1.29 0

llvmlite 0.15.0 py36_0

locket 0.2.0 py36_1

lxml 3.7.2 py36_0

markupsafe 0.23 py36_2

matplotlib 2.0.0 np111py36_0

mistune 0.7.3 py36_1

mkl 2017.0.1 0

mkl-service 1.1.2 py36_3

mpmath 0.19 py36_1

multipledispatch 0.4.9 py36_0

nbconvert 4.2.0 py36_0

nbformat 4.2.0 py36_0

networkx 1.11 py36_0

nltk 3.2.2 py36_0

nose 1.3.7 py36_1

notebook 4.3.1 py36_0

numba 0.30.1 np111py36_0

numexpr 2.6.1 np111py36_2

numpy 1.11.3 py36_0

numpydoc 0.6.0 py36_0

odo 0.5.0 py36_1

openpyxl 2.4.1 py36_0

openssl 1.0.2k 1

pandas 0.19.2 np111py36_1

partd 0.3.7 py36_0

path.py 8.1.1 <pip>

path.py 10.0 py36_0

pathlib2 2.2.0 py36_0

patsy 0.4.1 py36_0

pep8 1.7.0 py36_0

pexpect 3.3 <pip>

pexpect 4.2.1 py36_0

pickleshare 0.5 <pip>

pickleshare 0.7.4 py36_0

pillow 4.0.0 py36_0

pip 9.0.1 py36_1

ply 3.9 py36_0

prompt_toolkit 1.0.9 py36_0

psutil 5.0.1 py36_0

psycopg2 2.7.1 <pip>

ptyprocess 0.5.1 py36_0

py 1.4.32 py36_0

py4j 0.10.4 <pip>

pyasn1 0.1.9 py36_0

pycosat 0.6.1 py36_1

pycparser 2.17 py36_0

pycrypto 2.6.1 py36_4

pycurl 7.43.0 py36_2

pyflakes 1.5.0 py36_0

pygments 2.1.3 py36_0

pylint 1.6.4 py36_1

pyopenssl 16.2.0 py36_0

pyparsing 2.1.4 py36_0

pyqt 5.6.0 py36_1

pytables 3.3.0 np111py36_0

pytest 3.0.5 py36_0

python 3.6.0 0

python-dateutil 2.6.0 py36_0

python-dateutil 2.4.2 <pip>

python.app 1.2 py36_4

pytz 2016.10 py36_0

pyyaml 3.12 py36_0

pyzmq 16.0.2 py36_0

qt 5.6.2 0

qtawesome 0.4.3 py36_0

qtconsole 4.2.1 py36_1

qtpy 1.2.1 py36_0

readline 6.2 2

redis 3.2.0 0

redis-py 2.10.5 py36_0

requests 2.12.4 py36_0

requests 2.7.0 <pip>

rope 0.9.4 py36_1

ruamel_yaml 0.11.14 py36_1

s3transfer 0.1.10 <pip>

scikit-image 0.12.3 np111py36_1

scikit-learn 0.18.1 np111py36_1

scipy 0.18.1 np111py36_1

seaborn 0.7.1 py36_0

setuptools 27.2.0 py36_0

simplegeneric 0.8.1 py36_1

singledispatch 3.4.0.3 py36_0

sip 4.18 py36_0

six 1.10.0 py36_0

six 1.9.0 <pip>

smart-open 1.5.1 <pip>

snowballstemmer 1.2.1 py36_0

sockjs-tornado 1.0.3 py36_0

sphinx 1.5.1 py36_0

spyder 3.1.2 py36_0

sqlalchemy 1.1.5 py36_0

sqlite 3.13.0 0

statsmodels 0.6.1 np111py36_1

sympy 1.0 py36_0

terminado 0.6 py36_0

tk 8.5.18 0

toolz 0.8.2 py36_0

tornado 4.4.2 py36_0

traitlets 4.3.1 py36_0

traitlets 4.3.2 <pip>

unicodecsv 0.14.1 py36_0

virtualenv 15.1.0 <pip>

wcwidth 0.1.7 py36_0

werkzeug 0.11.15 py36_0

wheel 0.29.0 py36_0

widgetsnbextension 1.2.6 py36_0

wrapt 1.10.8 py36_0

xlrd 1.0.0 py36_0

xlsxwriter 0.9.6 py36_0

xlwings 0.10.2 py36_0

xlwt 1.2.0 py36_0

xz 5.2.2 1

yaml 0.1.6 0

zlib 1.2.8 3

# conda environments:

py2 /anaconda/envs/py2

py3 /anaconda/envs/py3

root * /anaconda

which python:

/anaconda/bin/python

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Arvind Kandaswamy

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Apr 2, 2017, 8:39:58 PM4/2/17

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In my Py3 environment, I uninstalled traitlets and reinstalled it. The problem went away. Not sure exactly how it broke in the first place.