Installing error: cannot import "ensure_str" from "six"

[linlinzhao]

Hi, I encounter an error while executing jupyter nbextension install --py --symlink --sys-prefix witwidget:
Traceback (most recent call last): File "/usr/bin/jupyter-nbextension", line 11, in <module> load_entry_point('notebook==5.2.2', 'console_scripts', 'jupyter-nbextension')() File "/usr/lib/python3/dist-packages/jupyter_core/application.py", line 266, in launch_instance return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs) File "/usr/lib/python3/dist-packages/traitlets/config/application.py", line 658, in launch_instance app.start() File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 988, in start super(NBExtensionApp, self).start() File "/usr/lib/python3/dist-packages/jupyter_core/application.py", line 255, in start self.subapp.start() File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 716, in start self.install_extensions() File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 695, in install_extensions **kwargs File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 211, in install_nbextension_python m, nbexts = _get_nbextension_metadata(module) File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 1122, in _get_nbextension_metadata m = import_item(module) File "/usr/lib/python3/dist-packages/traitlets/utils/importstring.py", line 42, in import_item return __import__(parts[0]) File "/home/linin/.local/lib/python3.6/site-packages/witwidget/__init__.py", line 15, in <module> from witwidget.notebook.visualization import * File "/home/linin/.local/lib/python3.6/site-packages/witwidget/notebook/visualization.py", line 27, in <module> from witwidget.notebook.jupyter.wit import * # pylint: disable=wildcard-import,g-import-not-at-top File "/home/linin/.local/lib/python3.6/site-packages/witwidget/notebook/jupyter/wit.py", line 25, in <module> from witwidget.notebook import base File "/home/linin/.local/lib/python3.6/site-packages/witwidget/notebook/base.py", line 26, in <module> from six import ensure_str ImportError: cannot import name 'ensure_str'

But I can import ensure_str within my python2 and python3, where could it go wrong?
Thanks a lot.

[jameswex]

Thanks for reporting. Haven't seen this one before. What environment are you running it in: are you inside a virtualenv? What does "pip list" show?

[linlinzhao]

The environment for "six" import error:
Windows Subsystem Linux, ubuntu 18.04
python3, no virtual environment

I just tried intall witwidget within a virtual env. This time it complained that no module named 'widget' , but it is clearly installed as pip list shows:

absl-py (0.9.0) astor (0.8.1) attrs (19.3.0) backcall (0.1.0) bleach (3.1.1) cachetools (4.0.0) decorator (4.4.2) defusedxml (0.6.0) entrypoints (0.3) gast (0.3.3) google-api-python-client (1.7.11) google-auth (1.11.2) google-auth-httplib2 (0.0.3) google-pasta (0.1.8) grpcio (1.27.2) h5py (2.10.0) httplib2 (0.17.0) importlib-metadata (1.5.0) ipykernel (5.1.4) ipython (7.13.0) ipython-genutils (0.2.0) ipywidgets (7.5.1) jedi (0.16.0) Jinja2 (2.11.1) jsonschema (3.2.0) jupyter (1.0.0) jupyter-client (6.0.0) jupyter-console (6.1.0) jupyter-core (4.6.3) Keras-Applications (1.0.8) Keras-Preprocessing (1.1.0) Markdown (3.2.1) MarkupSafe (1.1.1) mistune (0.8.4) nbconvert (5.6.1) nbformat (5.0.4) notebook (6.0.3) numpy (1.18.1) oauth2client (4.1.3) pandocfilters (1.4.2) parso (0.6.2) pexpect (4.8.0) pickleshare (0.7.5) pip (9.0.1) pkg-resources (0.0.0) prometheus-client (0.7.1) prompt-toolkit (3.0.4) protobuf (3.11.3) ptyprocess (0.6.0) pyasn1 (0.4.8) pyasn1-modules (0.2.8) Pygments (2.6.1) pyrsistent (0.15.7) python-dateutil (2.8.1) pyzmq (19.0.0) qtconsole (4.7.1) QtPy (1.9.0) rsa (4.0) Send2Trash (1.5.0) setuptools (39.0.1) six (1.14.0) tensorboard (1.14.0) tensorflow (1.14.0) tensorflow-estimator (1.14.0) termcolor (1.1.0) terminado (0.8.3) testpath (0.4.4) tornado (6.0.4) traitlets (4.3.3) uritemplate (3.0.1) wcwidth (0.1.8) webencodings (0.5.1) Werkzeug (1.0.0) wheel (0.34.2) widgetsnbextension (3.5.1) witwidget (1.6.0) wrapt (1.12.1) zipp (3.1.0)

Thanks for reporting. Haven't seen this one before. What environment are you running it in: are you inside a virtualenv? What does "pip list" show?

[linlinzhao]

Thanks for reporting. Haven't seen this one before. What environment are you running it in: are you inside a virtualenv? What does "pip list" show?

Hi, a quick update, I restarted the venv, then it was successfullly installed. I will play with wit.
So I closed this issue.