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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 _get_files(self) -> Iterator[str]: """Return paths to all requirements files """

        path = os.path.abspath(self.path)
        if os.path.isfile(path):
            path = os.path.dirname(path)

        for path in self._get_parents(path):
            for file_path in self._get_files_from_dir(path):
                yield file_path