Python dictionary append multiple values

Mapping keys to multiple values in a dictionary from Suwani Gunasekara Analytics Vidhya Average Source: 4.bp.blogspot.com Python How to add more values to a Youtube key dictionary. This will replace the aabc value from 1 to 2. What I want is that aabc has multiple values (both 1 and 2). List to dictionary conversion with multiple values per key? ................
................