1. from collections import defaultdict
  3. def index_lists(list_of_lists):
  4. """
  5. Indexes the content of a list of lists for batch processing with synchronous execution.
  7. Args:
  8. list_of_lists: A list where each element is a list of items to index.
  10. Returns:
  11. A dictionary where keys are unique items and values are lists of lists
  12. containing the original lists where the item was found.
  13. """
  14. index = defaultdict(list) # Use defaultdict for easy appending
  15. for lst in list_of_lists:
  16. for item in lst:
  17. index[item].append(lst) # Add list to the item's index
  18. return dict(index) # Convert back to a regular dict
  21. if __name__ == '__main__':
  22. # Example usage
  23. data = [
  24. [1, 2, 3],
  25. [2, 4, 5],
  26. [1, 5, 6]
  27. ]
  29. indexed_data = index_lists(data)
  30. print(indexed_data)

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