1. def validate_lists(list_of_lists):
  2. """
  3. Validates a list of lists for consistency and errors.
  4. """
  5. if not isinstance(list_of_lists, list):
  6. return "Error: Input must be a list."
  8. if not list_of_lists:
  9. return "Warning: Input list is empty."
  11. first_list_len = len(list_of_lists[0])
  12. for lst in list_of_lists:
  13. if not isinstance(lst, list):
  14. return "Error: All elements of the input list must be lists."
  15. if len(lst) != first_list_len:
  16. return f"Error: List lengths are inconsistent. Expected {first_list_len}, got {len(lst)}."
  17. for item in lst:
  18. if not isinstance(item, (int, float, str, bool, type(None))): #Allow common types
  19. return f"Error: List elements must be of type {type(lst[0]) if lst else 'any'}"
  20. return "Lists are valid."

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