How to generate a dictionary of dictionaries from an array?

Question

I have a array of strings like this:

Array = ['ABC', 'DEF', 'GHI']

How do I map this into a dictionary of dictionaries having the following shape?

dictionary = {
'ABC': {'DEF': auxFunction(ABC,DEF), 'GHI': auxFunction(ABC,GHI)},
'DEF': {'ABC': auxFunction(DEF,ABC), 'GHI': auxFunction(DEF,GHI)},
'GHI': {'ABC': auxFunction(GHI,ABC), 'DEF': auxFunction(GHI,DEF)},
}

What is the source of the calculation values? This must be know for someone to be able to answer your question. — martineau, Feb 10 '20 at 07:53

Guy · Accepted Answer · 2020-02-10T08:21:24.253

4

You can do it with two dict comprehensions

dictionary = {name: {x: auxFunction(name, x) for x in array if x != name} for name in array}

{'ABC': {'DEF': auxFunction(ABC, DEF), 'GHI': auxFunction(ABC, GHI)},
 'DEF': {'ABC': auxFunction(DEF, ABC), 'GHI': auxFunction(DEF, GHI)},
 'GHI': {'ABC': auxFunction(GHI, ABC), 'DEF': auxFunction(GHI, DEF)}}

edited Feb 10 '20 at 08:21

answered Feb 10 '20 at 07:57

Guy

46,488
10
44
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score 3 · Answer 2 · answered Feb 10 '20 at 07:56

You Can Try this:

finalDict= {}
Array = ['ABC', 'DEF', 'GHI']
for i in Array:
    tempDict = {}
    for j in Array:
        if i!= j:
            tempDict[j] = "A calculation between " + i + " - " + j
    finalDict[i] = tempDict
print(finalDict)

Output:

{
'ABC': {'DEF': 'A calculation between ABC - DEF', 'GHI': 'A calculation between ABC - GHI'},
'DEF': {'ABC': 'A calculation between DEF - ABC', 'GHI': 'A calculation between DEF - GHI'},
'GHI': {'ABC': 'A calculation between GHI - ABC', 'DEF': 'A calculation between GHI - DEF'}
}

score 1 · Answer 3 · answered Feb 10 '20 at 08:02

1

>>> auxFunction = max
>>> {Array[i]: {Array[j]: auxFunction(Array[i], Array[j]) for j in range(len(Array)) if j != i} for i in range(len(Array))}
{456: {123: 456, 789: 789}, 123: {456: 456, 789: 789}, 789: {456: 789, 123: 789}}

answered Feb 10 '20 at 08:02

SimfikDuke

943
6
21

How to generate a dictionary of dictionaries from an array?

3 Answers3