python生成图片验证码的代码，,#!/usr/bin/e

python生成图片验证码的代码，,#!/usr/bin/e

#!/usr/bin/env python  #coding=utf-8  import random  import Image, ImageDraw, ImageFont, ImageFilter  import StringIOfrom flask import Flask#map:将str函数作用于后面序列的每一个元素numbers = ''.join(map(str, range(10))) chars = ''.join((numbers))  def create_validate_code(size=(120, 30),                           chars=chars,                           mode="RGB",                           bg_color=(255, 255, 255),                           fg_color=(255, 0, 0),                           font_size=18,                           font_type="Monaco.ttf",                           length=4,                           draw_points=True,                           point_chance = 2):      '''''     size: 图片的大小，格式（宽，高），默认为(120, 30)     chars: 允许的字符集合，格式字符串     mode: 图片模式，默认为RGB     bg_color: 背景颜色，默认为白色     fg_color: 前景色，验证码字符颜色     font_size: 验证码字体大小     font_type: 验证码字体，默认为 Monaco.ttf     length: 验证码字符个数     draw_points: 是否画干扰点     point_chance: 干扰点出现的概率，大小范围[0, 50]     '''     width, height = size      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_points():          '''''绘制干扰点'''         chance = min(50, max(0, int(point_chance))) # 大小限制在[0, 50]          for w in xrange(width):              for h in xrange(height):                  tmp = random.randint(0, 50)                  if tmp > 50 - 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)          font = ImageFont.truetype(font_type, font_size)          font_width, font_height = font.getsize(strs)          draw.text(((width - font_width) / 3, (height - font_height) / 4),                      strs, font=font, fill=fg_color)          return strs      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）      return img,strs  app = Flask(__name__)  @app.route('/')  def index():      return 'test' @app.route('/code/')  def get_code():      #把strs发给前端,或者在后台使用session保存      code_img,strs = create_validate_code()      buf = StringIO.StringIO()      code_img.save(buf,'JPEG',quality=70)      buf_str = buf.getvalue()      response = app.make_response(buf_str)       response.headers['Content-Type'] = 'image/jpeg'      return response   if __name__ == "__main__":      app.run(host="localhost",port=18888,debug=True)