python图片验证码生成代码

#!/usr/bin/env python# -*- coding: UTF-8 -*- import randomfrom PIL import Image, ImageDraw, ImageFont, ImageFilter try:  import cStringIO as StringIOexcept ImportError:  import StringIO _letter_cases = "abcdefghjkmnpqrstuvwxy"            # 小写字母_upper_cases = "ABCDEFGHJKLMNPQRSTUVWXY"            # 大写字母_numbers = "1234567890"                     # 数字init_chars = ''.join((_letter_cases, _upper_cases, _numbers))  # 生成允许的字符集合default_font = "./DejaVuSans.ttf"                # 验证码字体  # 生成验证码接口def generate_verify_image(size=(120, 30),             chars=init_chars,             img_type="GIF",             mode="RGB",             bg_color=(255, 255, 255),             fg_color=(0, 0, 255),             font_size=18,             font_type=default_font,             length=4,             draw_lines=True,             n_line=(1, 2),             draw_points=True,             point_chance=2,             save_img=False):   """  生成验证码图片  :param size: 图片的大小，格式（宽，高），默认为(120, 30)  :param chars: 允许的字符集合，格式字符串  :param img_type: 图片保存的格式，默认为GIF，可选的为GIF，JPEG，TIFF，PNG  :param mode: 图片模式，默认为RGB  :param bg_color: 背景颜色，默认为白色  :param fg_color: 前景色，验证码字符颜色，默认为蓝色#0000FF  :param font_size: 验证码字体大小  :param font_type: 验证码字体，默认为 DejaVuSans.ttf  :param length: 验证码字符个数  :param draw_lines: 是否划干扰线  :param n_line: 干扰线的条数范围，格式元组，默认为(1, 2)，只有draw_lines为True时有效  :param draw_points: 是否画干扰点  :param point_chance: 干扰点出现的概率，大小范围[0, 100]  :param save_img: 是否保存为图片  :return: [0]: 验证码字节流, [1]: 验证码图片中的字符串  """   width, height = size # 宽， 高  img = Image.new(mode, size, bg_color) # 创建图形  draw = ImageDraw.Draw(img) # 创建画笔   def get_chars():    """生成给定长度的字符串，返回列表格式"""     return random.sample(chars, length)   def create_lines():    """绘制干扰线"""     line_num = random.randint(*n_line) # 干扰线条数     for i in range(line_num):      # 起始点      begin = (random.randint(0, size[0]), random.randint(0, size[1]))      # 结束点      end = (random.randint(0, size[0]), random.randint(0, size[1]))      draw.line([begin, end], fill=(0, 0, 0))   def create_points():    """绘制干扰点"""     chance = min(100, max(0, int(point_chance))) # 大小限制在[0, 100]     for w in xrange(width):      for h in xrange(height):        tmp = random.randint(0, 100)        if tmp > 100 - chance:          draw.point((w, h), fill=(0, 0, 0))   def create_strs():    """绘制验证码字符"""     c_chars = get_chars()    strs = ' %s ' % ' '.join(c_chars) # 每个字符前后以空格隔开     font = ImageFont.truetype(font_type, font_size)    font_width, font_height = font.getsize(strs)     draw.text(((width - font_width) / 3, (height - font_height) / 3),         strs, font=font, fill=fg_color)     return ''.join(c_chars)   if draw_lines:    create_lines()  if draw_points:    create_points()  strs = create_strs()   # 图形扭曲参数  params = [1 - float(random.randint(1, 2)) / 100,       0,       0,       0,       1 - float(random.randint(1, 10)) / 100,       float(random.randint(1, 2)) / 500,       0.001,       float(random.randint(1, 2)) / 500       ]  img = img.transform(size, Image.PERSPECTIVE, params) # 创建扭曲   img = img.filter(ImageFilter.EDGE_ENHANCE_MORE) # 滤镜，边界加强（阈值更大）   mstream = StringIO.StringIO()  img.save(mstream, img_type)   if save_img:    img.save("validate.gif", img_type)   return mstream, strs  if __name__ == "__main__":  mstream, strs = generate_verify_image(save_img=True)  print strs