NoSuchEntryPoint: No 'notebook' entry point found in group 'altair.vegalite.v2.renderer'

I have followed the installation instructions here:

https://altair-viz.github.io/getting_started/installation.html#quick-start-altair-notebook

This appears to be a problem with the 2.0 version of vega being published an hour ago. This notebook was working previously with 1.3.0. In fact, if I change the install line to:

!pip install --upgrade altair vega_datasets notebook vega==1.3.0

things work.

Here’s my output without the vega version restriction.

# Install Altair (for visualizations)
!pip install --upgrade altair vega_datasets notebook vega

<snip>

Installing collected packages: altair, notebook, vega
  The scripts jupyter-bundlerextension, jupyter-nbextension, jupyter-notebook and jupyter-serverextension are installed in '/home/jupyter-user/.local/bin' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
Successfully installed altair-2.2.2 notebook-5.6.0 vega-2.0.0

<snip>

import vega
import altair as alt

# for the notebook only (not for JupyterLab) run this command once per session
print(vega.__version__)
alt.renderers.enable('notebook')

2.0.0
---------------------------------------------------------------------------
NoSuchEntryPoint                          Traceback (most recent call last)
~/.local/lib/python3.4/site-packages/altair/utils/plugin_registry.py in _enable(self, name, **options)
    133             try:
--> 134                 ep = entrypoints.get_single(self.entry_point_group, name)
    135             except entrypoints.NoSuchEntryPoint:

~/.local/lib/python3.4/site-packages/entrypoints.py in get_single(group, name, path)
    185 
--> 186     raise NoSuchEntryPoint(group, name)
    187 

NoSuchEntryPoint: No 'notebook' entry point found in group 'altair.vegalite.v2.renderer'

During handling of the above exception, another exception occurred:

ValueError                                Traceback (most recent call last)
<ipython-input-4-152d9ee0b52b> in <module>()
      4 # for the notebook only (not for JupyterLab) run this command once per session
      5 print(vega.__version__)
----> 6 alt.renderers.enable('notebook')

~/.local/lib/python3.4/site-packages/altair/utils/plugin_registry.py in enable(self, name, **options)
    169         if name is None:
    170             name = self.active
--> 171         return PluginEnabler(self, name, **options)
    172 
    173 

~/.local/lib/python3.4/site-packages/altair/utils/plugin_registry.py in __init__(self, registry, name, **options)
     23         self.options = options
     24         self.original_state = registry._get_state()
---> 25         self.registry._enable(name, **options)
     26 
     27     def __enter__(self):

~/.local/lib/python3.4/site-packages/altair/utils/plugin_registry.py in _enable(self, name, **options)
    135             except entrypoints.NoSuchEntryPoint:
    136                 if name in self.entrypoint_err_messages:
--> 137                     raise ValueError(self.entrypoint_err_messages[name])
    138                 else:
    139                     raise

ValueError: 
To use the 'notebook' renderer, you must install the vega package
and the associated Jupyter extension.
See https://altair-viz.github.io/getting_started/installation.html
for more information.

Let me know if you need more information.

[jakevdp]

just downgrading altair from 4.0 to 3.0 its work fine

No need to downgrade: use the default renderer (i.e. delete alt.renderers.enable('notebook') from your code) and Altair 4.0 will work fine with Jupyter Notebook.

[jakevdp]

Yes, the new Vega package is for Altair 3.

I plan to release Altair 3 some time this week… depending on how much time I can find in the evenings after kids go to sleep 😄