Convert text to rainbow BBCode

RainbowText.py

class RainbowText:
    def colours(self):
        return ['ff00ff','ff00cc','ff0099','ff0066','ff0033','ff0000','ff3300','ff6600','ff9900','ffcc00','ffff00','ccff00','99ff00','66ff00','33ff00','00ff00','00ff33','00ff66','00ff99','00ffcc','00ffff','00ccff','0099ff','0066ff','0033ff','0000ff','3300ff','6600ff','9900ff','cc00ff']
        
    def dividor(self, text):
        return float(len(self.colours())) / float(len(text))
        
    def convert(self, text):
        code = ""
        for i in range(0, len(text)):
            code += self.bbcode(text[i], self.colours()[int(self.dividor(text) * i)])
        return code
    
    def bbcode(self, text, colour):
        return "[color='#" + colour + "']" + text + "[/color]" if text != " " else " "
    
rainbow_text = RainbowText()
print rainbow_text.convert("Hello my name is Alex/Artificial. I'm just testing the convert function.")