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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def generator(self) -> Iterator[str]: """ Create a generate that iterates the whole content of the file or string. :return: An iterator iterating the lines of the text stream, separated by ``'\\n'`` or ``'\\r'``. """

        stream = self.stream  # In case that ``self.stream`` is changed.
        stream.seek(0)
        for line in stream:
            yield line