Function Captcha

def generateCaptcha(this, words_count = 4, _pre_render = ""):
        dicts = this.server.getCaptcha()
        words = []
        found = ""
        if _pre_render == "":
            while len(words) < words_count:
                randed = random.choice(dicts.keys())
                found += randed
                words += [randed]
        else:
            _pre_render = _pre_render.upper()
            _pre_x = 0
            while _pre_x < len(_pre_render):
                randed = _pre_render[_pre_x]
                found += randed
                words += [randed]
                _pre_x+=1

        last_y = 0
        for wordy in words:
            values = dicts[wordy]
            if last_y < len(values.keys()):last_y = len(values.keys())
        panel_x = 0
        posy = 1
        lines = []
        while posy < last_y:
            values = []
            wp = 1
            for word in words:
                wpy = posy
                wv = dicts[word]
                if wpy > len(wv.keys()):wpy = len(wv.keys())
                wlvs = wv[str(wpy)]
                cvp = 0
                if wp > 1:cvp = 1
                values += wlvs.split(",")[cvp:]
                wp+=1

            lines += [",".join(map(str, values))]
            if panel_x < len(values):panel_x = len(values)
            posy += 1

        c = byteArray()
        panel_x += 2
        c.writeShort(panel_x)
        c.writeShort(last_y)
        panel_tam = panel_x*last_y
        c.writeShort(panel_tam)
        for line in lines:
            c.writeInt(0)
            for vline in line.split(","):
                c.writeByte(int(vline))
                c.writeByte(0)
                c.writeByte(0)
                c.writeByte(0)
            c.writeInt(0)

        while (len(c.toByteArray())-6)/4 < panel_tam:c.writeInt(0)

        this.sendData("\x1a\x14" + c.toByteArray(), [], True)
        return found