def tryLoadRegionFile(self, filepath):
        filename = os.path.basename(filepath)
        bits = filename.split('.')
        if 4 < len(bits) or bits[0] != 'r' or bits[3] != "mca":
            return None

        try:
            rx, rz = map(int, bits[1:3])
        except ValueError:
            return None

        return MCRegionFile(filepath, (rx, rz))
dataset/ETHPy150Open mcedit/pymclevel/infiniteworld.py/AnvilWorldFolder.tryLoadRegionFile/swapped operands of `<`