TypeError: the JSON object must be str, not 'bytes' about jupyterlab-toc HOT 7 CLOSED

Just opened jupyterlab/jupyterlab#4962 with this fix. Thanks again @slowkow

from jupyterlab-toc.

What version of JupyterLab are you using? You may have caught us in the middle of the release cycle: v0.3.1 is targeting the new release of JupyterLab (v0.33, still in RC).

Edit: ah, I see 0.32.1 in your original message. This new version of the package will not work with that, I think. I recommend either holding of for a day or so, or trying the RC of JupyterLab 0.33.

from jupyterlab-toc.

Yes, I think you're right... but there may also be a bug.

I didn't check my version before upgrading, but I can verify that I got this message with the old version (unknown) of jupyterlab and with the new version (0.32.1):

Errored, use --debug for full output:
ValueError: No version of @jupyterlab/toc could be found that is
 compatible with the current version of JupyterLab. However, it
 seems to support a new version of JupyterLab.
 Consider upgrading JupyterLab.

Conflicting Dependencies:
JupyterLab              Extension        Package
>=0.16.3 <0.17.0        >=0.17.0 <0.18.0 @jupyterlab/rendermime
>=0.16.3 <0.17.0        >=0.17.0 <0.18.0 @jupyterlab/notebook
>=0.16.4 <0.17.0        >=0.17.0 <0.18.0 @jupyterlab/apputils
>=0.16.3 <0.17.0        >=0.17.0 <0.18.0 @jupyterlab/fileeditor
>=1.1.3 <2.0.0          >=2.0.0 <3.0.0   @jupyterlab/coreutils
>=0.16.3 <0.17.0        >=0.17.0 <0.18.0 @jupyterlab/application
>=0.16.3 <0.17.0        >=0.17.0 <0.18.0 @jupyterlab/docmanager

To get this error, first I had to fix a bug in this file:

/data/srlab/slowikow/src/miniconda2/envs/py3/lib/python3.5/site-packages/jupyterlab/commands.py

I changed line 1588 in _fetch_package_metadata() from this:

return json.load(response)

to this:

return json.loads(response.read().decode('utf-8'))

This got me past the issue with TypeError: the JSON ..., but now I get the new issue complaining that my jupyterlab version is too old.

from jupyterlab-toc.

Interesting. What version of Python are you using? I may have seen this before with 3.5...

from jupyterlab-toc.

Yep, you are right:

python --version
Python 3.5.2 :: Continuum Analytics, Inc.

from jupyterlab-toc.

Great, thanks for the report @slowkow! This fix will need to go into the core JupyterLab python package.

from jupyterlab-toc.

Fixed by jupyterlab/jupyterlab#4962

from jupyterlab-toc.