[BUG] Issue running Dash on Google Colab (with proposed solution)

[leontoddjohnson]

Hello!

I was running Dash on Google Colab, and I found that (even after installing dash) the recommended code did not work. It turns out, the default Google Colab environment does not include Dash or comm, and that package looks to be required for it to work. In other words, the comm requirement seems to be causing issues ...

Proposal

• Adjust/Add documentation on Google Colab to include the Dash/comm package install issue
• Adjust/Loosen (?) the comm package requirement

Current Example
Right now, this seems to work:

First, install packages:

!pip install dash comm

Then, choose app run option.

app.run(debug=True, jupyter_mode='inline', jupyter_height=800)

# OPTIONAL: create url to open in new tab (requires runtime restart)
# app.run(debug=True, host='localhost', jupyter_mode='external')

Thanks!

[camdecoster]

Thanks for the report! The team will take a look when we have time and follow up.

[T4rk1n]

Seems like comm is usually included from another dependency, since it's used directly it should be added to requirements/install.txt