edges = [('Child1', 'Parent1'), ('Child2', 'Parent2'), ('Child3', 'Parent1'), ('Child4', 'Parent3'), ('Child2', 'Parent1')] parents = list(set([edge[1] for edge in edges])) # unique list of parents parents.sort() # sort list of parents edges2 = [] for p in parents: temp = [] for e in edges: if e[1] == p: temp.append(e[0]) temp.sort() edges2.append((p, tuple(temp))) print(edges2)
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