display_formats broken?

[jbednar]

I can use display_formats in hv.extension() in the notebook if I specify the default value:

But if I choose svg or png I get errors:

I'm trying to find a pure Python replacement for the %output magic, and I think this is intended to be it, but it doesn't seem to be working.

[jbednar]

The docs also make it sound like multiple display formats are allowed (as it's a list), but that gives an additional error:

[philippjfr]

The double traceback is due to an older IPython version, what version are you using so we can pin past it?

[jbednar]

ipython=5.4.1