switch key and values in a dict of lists

Question

Hello Stackoverflow people,

I have a nested dictionary with lists as values and I want to create a dict where all the list entries get their corresponding key as value.<

Answer 1

Use dictionary comprehension:

d = {'a': 'b', 'c': 'd', 'e': 'f'}
d2 = dict((v1, k) for k, v in d.items() for v1 in v)  # Here is the one-liner