How would I make a list of tuples of size three into key-value pairs?

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How would I make a list of tuples of size three into key-value pairs?



Objective:

1st number: Key to the second number

2nd number: Value to the first number but key to the third number

3rd number: Value to the second number


def make_dictionary_list(old_list):
return key: values for key, *values in old_list



Input:
[(4157, 1, 1), (4157, 1, 10), (4157, 2, 1), (4157, 2, 10), (4157, 3, 1), (4157, 3, 10), (4157, 4, 1), (4157, 4, 10), (4182, 1, 1)]


[(4157, 1, 1), (4157, 1, 10), (4157, 2, 1), (4157, 2, 10), (4157, 3, 1), (4157, 3, 10), (4157, 4, 1), (4157, 4, 10), (4182, 1, 1)]



Output:
4157: [4, 10], 4182: [1, 1]


4157: [4, 10], 4182: [1, 1]



The output is not what I want. As stated above, I'd like the 1st number being key to the 2nd number and 2nd number being the key to the 3rd number. How would I go about doing that?



Thanks!





you have duplicate keys.
– Garr Godfrey
5 mins ago




1 Answer
1



You unravel your list:


data = [(4157, 1, 1), (4157, 1, 10), (4157, 2, 1), (4157, 2, 10), (4157, 3, 1), (4157, 3, 10), (4157, 4, 1), (4157, 4, 10), (4182, 1, 1)]

d =
for k,v,p in data:
key = d.setdefault(k,)
key[v]=p

print(d)



Output:


4157: 1: 10, 2: 10, 3: 10, 4: 10, 4182: 1: 1



The result is shorter then your sourcedata because you redefine the values of your inner dict for:


(4157, 1, 1) => (4157, 1, 10)
(4157, 2, 1) => (4157, 2, 10)
(4157, 3, 1) => (4157, 3, 10)
(4157, 4, 1) => (4157, 4, 10)



The first value gets replaced by the second one. You could aggregate them like so:


for k,v,p in data:
key = d.setdefault(k,)
key2 = key.setdefault(v,)
key2.append(p)

print(d)



To get an output of:


4157: 1: [1, 10], 2: [1, 10], 3: [1, 10], 4: [1, 10], 4182: 1: [1]






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