List of list to diction6

Question

i have a list x = [[1, 2], [1, 4], [1, 7], [1, 9], [2, 3], [2, 6], [2, 8], [3, 5]] want to convert x into a dictionary of dictionaries like so.{1:[2,4,7],2:[3,5,6]} in python

Answer 1

Is there mistakes in your example result?