Python Question
Processing dictionary of dictionaries
I have a dictionary - where the values are dictionaries themselves.
How do I extract the unique set of the values from the child dictionaries in the most efficient way?
{ 'A':{'A1':'A1V','B2':'A2V'..},
'B':{'B1':'B1V','B2':'B2V'...},
...}
Expected output:
['A1V','A2V','B1V','B2V'...]
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Answer Source
In a single line:
>>> [val for dct in x.values() for val in dct.values()]
['A1V', 'A2V', 'B2V', 'B1V']
Assuming you named your dict of dict x.
You mentioned unique, in that case replace the list-comprehension by a set-comprehension:
>>> {val for dct in x.values() for val in dct.values()} # curly braces!
{'A1V', 'A2V', 'B1V', 'B2V'}
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