Issue on page /tutorial_jupyter.html

[vbrunelle]

Hi, I am new with vaex. But I am wondering if am I the only one here that tried using the .ipynb downloadable file from the webpage at https://vaex.io/docs/tutorial_jupyter.html and getting an error while re-running the file exactly as it is, line by line, in a local jupyter notebook?

Here is the first jupyter code cell that returns an error:

data_array_widget = df.widget.data_array(axes=[Lz_axis, E_axis], selection=[None, 'default'])
data_array_widget  # being the last expression in the cell, Jupyter  will 'display' the widget

which returns me this error:

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
Cell In [4], line 1
----> 1 data_array_widget = df.widget.data_array(axes=[Lz_axis, E_axis], selection=[None, 'default'])
    2 data_array_widget  # being the last expression in the cell, Jupyter  will 'display' the widget

File c:\users\myuser\appdata\local\programs\python\python39\lib\site-packages\vaex\jupyter\__init__.py:57, in DataFrameAccessorWidget.data_array(self, axes, selection, shared, display_function, **kwargs)
    52 '''Create a :func:`vaex.jupyter.model.DataArray` model and :func:`vaex.jupyter.view.DataArray` widget and links them.
    53 
    54 This is a convenience method to create the model and view, and hook them up.
    55 '''
    56 import vaex.jupyter.model
---> 57 import vaex.jupyter.view
    58 if selection is not None:
    59     selection = selection.copy()

File c:\users\myuser\appdata\local\programs\python\python39\lib\site-packages\vaex\jupyter\view.py:10
    7 import numpy as np
    8 from IPython.display import display
---> 10 from . import widgets as vw
    11 from . import model
    12 from .traitlets import traitlet_fixes

File c:\users\myuser\appdata\local\programs\python\python39\lib\site-packages\vaex\jupyter\widgets.py:499
    495     def vue_action(self, data):
    496         self.value = data['value']
--> 499 class ToolsToolbar(v.VuetifyTemplate):
    500     interact_value = traitlets.Unicode(tools_items_default[0]['value'], allow_none=True).tag(sync=True)
    501     interact_items = traitlets.Any(tools_items_default).tag(sync=True)

File c:\users\myuser\appdata\local\programs\python\python39\lib\site-packages\vaex\jupyter\widgets.py:517, in ToolsToolbar()
    513 @traitlets.default('template')
    514 def _template(self):
    515     return load_template('vue/tools-toolbar.vue')
--> 517 @observe('z_normalize')
    518 def _observe_normalize(self, change):
    519     self.normalize = bool(self.z_normalize)

NameError: name 'observe' is not defined

I am on Windows 10, Python is 3.9 and jupyter is 6.5.4. Vaex is 4.16.0. Anything I am missing?

[LukeDickerson19]

duplicate of #2321, i resolved this error for myself with this solution. I'm also using Vaex 4.16.0