一.基本流程：

1.首先创建图片对象
2.创建画笔对象
3.往图片中添加噪点
4.生成验证码随机数
5.绘制图片，完成后释放画笔
6.文件操作，并且返回

二.代码块

from PIL import Image,ImageDraw,ImageFont
import random
from django.http import HttpResponse
import io
def virefycode(request):
  
  width = 100
  height = 50
  bgcolor =     (random.randrange(255),random.randrange(255),random.randrange(255))  # 随机颜色生成
  image = Image.new('RGB',(width,height),bgcolor)  # 创建图片
  draw = ImageDraw.Draw(image)      # 画笔对象
  for i in range(1000):
      xy = (random.randint(0,width),random.randint(0,height) # 噪点的范围
      fill = (random.randint(0,255),255,random.randint(0,255)  # 取随机颜色
      draw.point(xy,fill = fill)         # 绘制噪点




# 添加验证码
  str =   '1234567890QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm'
# 产生随机数
  rand_str = ''
  for i in range(0,4):
      rand_str += str[random.randint(0, len(str)-1)]

# 指定字体类型
  font = ImageFont.truetype('static/fonts/Songti.ttc', 35)  # 后面的是字体的大小

    # 字体颜色
  font_color1 =   (random.randint(0,255),random.randint(0,255),random.randint(0,255))
  font_color2 = (random.randint(0, 255), random.randint(0, 255),   random.randint(0, 255))
  font_color3 = (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))
  font_color4 = (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))

    # 绘制字体
  draw.text((5, 2),  rand_str[0], font=font, fill=font_color1)
  draw.text((25, 2), rand_str[1], font=font, fill=font_color2)
  draw.text((45, 2), rand_str[2], font=font, fill=font_color3)
  draw.text((65, 2), rand_str[3], font=font, fill=font_color4)

    # 释放画笔
  del draw

    # 文件操作
  buff = io.BytesIO()
  image.save(buff, 'png')


  return HttpResponse(buff.getvalue(), 'image/png')