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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 read(cls, filename, offset=None, encoding="iso-8859-1"):
 """Read an ID3v1 tag from a file."""

        with fileutil.opened(filename, "rb") as file:
            if offset is None:
                file.seek(-128, 2)
            else:
                file.seek(offset)
            data = file.read(128)
            return cls.decode(data, encoding=encoding)