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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 file_handles(self) -> Iterable[IO[str]]: """Generates all file handles represented by the analysis. Callee owns file handle and closes it when the next is yielded or the generator ends. """

        if self.file_handle:
            yield self.file_handle
            self.file_handle.close()
            self.file_handle = None
        else:
            for name in self.file_names():
                with open(name, "r") as f:
                    yield f