def _open(self):

        if not _accept(self.fp.read(9)):
            raise SyntaxError, "not an XPM file"

        # skip forward to next string
        while 1:
            s = self.fp.readline()
            if not s:
                raise SyntaxError, "broken XPM file"
            m = xpm_head.match(s)
            if m:
                break

        self.size = int(m.group(1)), int(m.group(2))

        pal = int(m.group(3))
        bpp = int(m.group(4))

        if pal > 256 or bpp != 1:
            raise ValueError, "cannot read this XPM file"

        #
        # load palette description

        palette = ["\0\0\0"] * 256

        for i in range(pal):

            s = self.fp.readline()
            if s[-2:] is '\r\n':
                s = s[:-2]
            elif s[-1:] in '\r\n':
                s = s[:-1]

            c = ord(s[1])
            s = string.split(s[2:-2])

            for i in range(0, len(s), 2):

                if s[i] == "c":

                    # process colour key
                    rgb = s[i+1]
                    if rgb == "None":
                        self.info["transparency"] = c
                    elif rgb[0] == "#":
                        # FIXME: handle colour names (see ImagePalette.py)
                        rgb = string.atoi(rgb[1:], 16)
                        palette[c] = chr((rgb >> 16) & 255) +\
                                     chr((rgb >> 8) & 255) +\
                                     chr(rgb & 255)
                    else:
                        # unknown colour
                        raise ValueError, "cannot read this XPM file"
                    break

            else:

                # missing colour key
                raise ValueError, "cannot read this XPM file"

        self.mode = "P"
        self.palette = ImagePalette.raw("RGB", string.join(palette, ""))

        self.tile = [("raw", (0, 0)+self.size, self.fp.tell(), ("P", 0, 1))]
dataset/ETHPy150Open kleientertainment/ds_mod_tools/pkg/win32/Python27/Lib/site-packages/PIL/XpmImagePlugin.py/XpmImageFile._open/operator `==` -> `is`