extracting from list of dictionary

Question

I have a list of dictionaries.
Keys in every dictionary in the list have another dictionary as a value.

[{'A':{'AX':'','source':'rock'}},

{'B':{'BX':'','source':'paper'}},

{'C':{'CX':'','source':'scissors'}}]

I would need to list out the values of the 'source' key in all the child dictionaries in the list (one-liner if possible)- as a set.
Expected output:

['rock','paper','scissors']

Please assist.

Answer 1

If dlist is your list of dictionaries, then:

values = set([list(d.values())[0]['source'] for d in dlist])

Additionally, if you don't care about mutating the dictionaries, you can also do this:

values = set([d.popitem()[1]['source'] for d in dlist])

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