The new Form feature in Google Colaboratory

Question

Can someone explain or give a notebook example how to use the new Form feature? It looks really exciting, but I cannot find any example or even an announcement anyw

Answer 1

Exciting feature indeed. It seems we can use checkboxes and date fields:

boolean_checkbox = True #@param {type:"boolean"}
date_input = '2018-03-22' #@param {type:"date"}

but I would really love to be able to construct dropdown lists using existing variables. Currently this seems limited:

dropdown = '1st option' #@param ["1st option", "2nd option", "3rd option"]

To be clear I'd love to be able to write

countries = df['country'][0] #@param df.country.unique()

Anyone?