<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def topil(self):
 """Returns a PIL.Image version of this Pix"""

        from PIL import Image

        # Leptonica manages data in words, so it implicitly does an endian
        # swap.  Tell Pillow about this when it reads the data.
        pix = self
        if sys.byteorder == 'little':
            if self.mode == 'RGB':
                raw_mode = 'XBGR'
            elif self.mode == 'RGBA':
                raw_mode = 'ABGR'
            elif self.mode == '1':
                raw_mode = '1;I'
                pix = Pix(lept.pixEndianByteSwapNew(pix._cdata))
            else:
                raw_mode = self.mode
                pix = Pix(lept.pixEndianByteSwapNew(pix._cdata))
        else:
            raw_mode = self.mode  # no endian swap needed

        size = (pix._cdata.w, pix._cdata.h)
        bytecount = pix._cdata.wpl * 4 * pix._cdata.h
        buf = ffi.buffer(pix._cdata.data, bytecount)
        stride = pix._cdata.wpl * 4

        im = Image.frombytes(self.mode, size, buf, 'raw', raw_mode, stride)

        return im