Is it possible to create a dictionary with multiple keys for a single value

Question

How to create a dictionary with multiple keys mapped to a single value?

Answer 1

One thing that you can do here is to create a dictionary where a single key has multiple values and then reverse it. For example,

dict1 = {"a": [1,2,3], "b": [4]}
dict2 = {value:key for key in dict1 for value in dict1[key]}
dict2

This will give output as - {1: 'a', 2: 'a', 3: 'a', 4: 'b'}