Error when calling the metaclass bases function() argument 1 must be code, not str

[sector119]

I use python 2.4.1 and PIL 1.1.5 and when I execute my program I got
error:

./code.py
Traceback (most recent call last):
  File "./code.py", line 7, in ?
    class DrawPlus(ImageDraw.Draw):
TypeError: Error when calling the metaclass bases
    function() argument 1 must be code, not str


Why I got this error? It work good on python 2.3 + PIL 1.1.4



#!/usr/bin/env python
# -*- coding: iso8859-1 -*-

import random
import Image, ImageFont, ImageDraw

class DrawPlus(ImageDraw.Draw):
    def __init__(self, im, mode=None):
	ImageDraw.Draw.__init__(self, im, mode=None)

    def text(self, xy, text, fill=None, font=None, angle=None,
anchor=None):
	ink, fill = self._getink(fill)
	if font is None:
	    font = self.getfont()
	if ink is None:
	    ink = fill
	if ink is not None:
	    bitmap = font.getmask(text)
	    if angle is not None:
		bitmap = bitmap.rotate(angle, Image.BILINEAR)
	    self.draw.draw_bitmap(xy, bitmap, ink)

class ImageRandomCode:
    def __init__(self, filename, size=None):
	# plain text code
	self.code = ''
	# code image file name
	self.filename = filename
	# fonts
	import glob
	dir = 'fonts/*.ttf'
	self.fonts = glob.glob(dir)
	# chars tuple
	#self.chars = chars or
('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z')
	self.chars = ('0','1','2','3','4','5','6','7','8','9')
	# image width
	self.img_width = 100
	# image height
	self.img_height = 30
	# image size = (image width, image height)
	self.img_size = size or (self.img_width, self.img_height)
	# image background color (r,g,b)
	self.img_background_color = (255, 255, 255)
	# image font color (r,g,b)
	self.img_font_color = (0, 0, 0)
	# code length
	self.length = 5
	# minimum font size
	self.font_size_min = 13	# 12
	# maximum font size
	self.font_size_max = 18
	# maximum noise lines to draw
	self.lines_noise_max = 3
	# maximum noise pixels to draw
	self.pixels_noise_percent = 3 # 5
	# maximum char angle
	self.angle_max = 15 # 20

	img = Image.new('RGB', self.img_size, self.img_background_color)
	self.draw = DrawPlus(img)

	self.draw_chars()
	self.draw_noise()

	del self.draw
	img.save(self.filename)

    def draw_noise(self):
	self.draw_noise_pixels()
	self.draw_noise_lines()

    def get_code(self):
	return self.code

    def get_filename(self):
	return self.filename

    def draw_chars(self, chars=None, length=None):
	chars = chars or self.chars
	length = length or self.length
        for i in range(length):
	    font_size = random.randint(self.font_size_min, self.font_size_max)
	    font_name = random.choice(self.fonts)
	    font = ImageFont.truetype(font_name, font_size)
	    angle = random.randint(-self.angle_max, +self.angle_max)
	    text = random.choice(chars)
	    size = self.draw.textsize(text, font=font)
	    x = i*(self.img_width-2-2)/length
	    y = random.randint(2, self.img_height-size[1]-2)
	    self.draw.text((x,y), text, font=font, angle=angle,
fill=self.img_font_color)
	    self.code += text

    def draw_noise_pixels(self, percent=None):
	percent = percent or self.pixels_noise_percent
	N = int(self.img_width*self.img_height*percent/100)
	for i in range(N):
	    x = random.randint(0, self.img_width)
	    y = random.randint(0, self.img_height)
	    self.draw.point((x,y), fill=self.img_font_color)
	for i in range(N):
	    x = random.randint(0, self.img_width)
	    y = random.randint(0, self.img_height)
	    self.draw.point((x,y), fill=self.img_background_color)

    def draw_noise_lines(self, max=None):
	max = max or self.lines_noise_max
	N = random.randint(0, max)
	for i in range(N):
	    x1 = random.randint(0, self.img_width)
	    y1 = random.randint(0, self.img_height)
	    x2 = random.randint(0, self.img_width)
	    y2 = random.randint(0, self.img_height)
	    self.draw.line((x1,y1,x2,y2), fill=(0,0,0))

code = ImageRandomCode('test.png')

print code.get_code()