Python university exam,

You need to group your data by the line:

import itertools
input = [('line1', 0, 5), ('line1', 0, 6), ('line2', 0, 3), ('line1', 0, 5), ('line3', 0, 4), ('line2', 0, 9), ('line3', 0, -1), ('line2', 0, 9), ('line2', 0, 10), ('line3', 0, 12), ('line1', 0, 1), ('line3', 0, 16)]
new_result = {a:[c for *_, c in b] for a, b in itertools.groupby(sorted(input, key=lambda x:x[0]), key=lambda x:x[0])}
final_result = {a:round(sum(b)/float(len(b)), 2) for a, b in new_result.items()}

Output:

{'line1': 4.25, 'line3': 7.75, 'line2': 7.75}

Edit: simpler option with collections.defaultdict:

from collections import defaultdict
d = defaultdict(list)
for a, _, b in input:
  d[a].append(b)

final_result = {a:round(sum(b)/float(len(b)), 2) for a, b 
                                                    

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