Wondering if anyone can help me understand why python altair chart is not printing...

I’m only seeing this when I run the code:

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It literally isn’t outputting anything.

This is what my chart looks like converted to_dict; recommended for troubleshooting to ensure you have data.

enter image description here

Any ideas about why it’s not displaying a graph/chart/etc, and only printing a blank line?

Adding the head of the csv in pandas form.

enter image description here

  • $\begingroup$ It may be helpful if you post more of your code and/or a sample of your data. Have you already added %matplotlib inline at the top of your notebook? This enables matplotlib figures to be shown inline. $\endgroup$
    – zachdj
    Aug 20, 2019 at 13:46
  • 1
    $\begingroup$ Thanks for the suggestion @zachdj. I just added "%matplotlib inline" at the top and it still didn't work. I did think that was necessary since I'm trying to display a Altair chart and not a matplotlib graph. $\endgroup$ Aug 20, 2019 at 17:59
  • $\begingroup$ I've never used Altair before, and mistakenly assumed that it was using matplotlib as a backend (similar to seaborn). It looks like you've already enabled the notebook renderer. Do you have vega installed in the environment running your notebook? $\endgroup$
    – zachdj
    Aug 20, 2019 at 18:57
  • $\begingroup$ No worries. I think that might be it. I have it installed on my system, but apparently not enabled for the notebook. Any ideas about the following error? When I run this command: sudo jupyter nbextension enable --sys-prefix vega I keep getting the following error : OSError: [Errno 1] Operation not permitted: '/System/Library/Frameworks/Python.framework/Versions/2.7/etc' $\endgroup$ Aug 20, 2019 at 20:11

1 Answer 1


The issue was enabling the vega module/extension in the notebook. Installing it is only half the battle, then you must enable it. :)

sudo jupyter-nbextension enable vega --py --user


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