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    The format the test uses is:
    Sudoku(data).is_valid()
    Your function returns a boolean, so the equivalent to this ends up happening:
    result = Sudoku(data) # You return a boolean
    if result.is_valid(): ... # AttributeError

    If you are dead set on using a function, you need to make sure it returns some kind of object with a method called is_valid() that returns the result. Hint: try using collections.namedtuple

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