Method _seek_check

src/PIL/ImageFile.py:455–468

(self, frame: int)

    #     pass

    def _seek_check(self, frame: int) -> bool:
        if (
            frame < self._min_frame
            # Only check upper limit on frames if additional seek operations
            # are not required to do so
            or (
                not (hasattr(self, "_n_frames") and self._n_frames is None)
                and frame >= getattr(self, "n_frames") + self._min_frame
            )
        ):
            msg = "attempt to seek outside sequence"
            raise EOFError(msg)

        return self.tell() != frame


class StubHandler(abc.ABC):