[FIXED] comparing lists for elements excluding one or more element python

Issue

Hey :) How can I compare lists so that all elements of the lists match except for one element the color? If all other elements match, the lists should be concatenated into one.

fruitlist = [['Apple', 'red', 10], ['Apple', 'green', 10], ['Apple', 'pink', 10], ['Apple', 'yellow', 20], ['Banana', 'yellow', 10]]

output:

fruitlist = [['Apple', 'red, green, pink', 10], ['Apple', 'yellow', 20],['Banana', 'yellow', 10]]

Is there also a solution here that applies to much longer lists? (excluding one or more elements)

Solution

Use an intermediate dictionary then construct your output list as follows:

from collections import defaultdict
mdict = defaultdict(list)

fruitlist = [['Apple', 'red', 10], ['Apple', 'green', 10], ['Apple', 'pink', 10], ['Apple', 'yellow', 20], ['Banana', 'yellow', 10]]

for fruit, colour, n in fruitlist:
    mdict[fruit, n].append(colour)

print([[fruit, ', '.join(v), n] for (fruit, n), v in mdict.items()])

Output:

[['Apple', 'red, green, pink', 10], ['Apple', 'yellow', 20], ['Banana', 'yellow', 10]]

Answered By - Arthur King