$ pip3 install pillow

vericode.py

from PIL import Image,ImageDraw,ImageFont,ImageFilter
import random

 #随机码 默认长度=1
def random_code(lenght=1):  
  code = ''
  for char in range(lenght):
    code += chr(random.randint(65,90))
  return code

 #随机颜色 默认颜色范围【1，255】
def random_color(s=1,e=255):
  return (random.randint(s,e),random.randint(s,e),random.randint(s,e))

 #生成验证码图片
 #length 验证码长度
 #width 图片宽度
 #height 图片高度
 #返回验证码和图片
def veri_code(lenght=4,width=160,height=40):
  #创建Image对象
  image = Image.new('RGB',(width,height),(255,255,255))
  #创建Font对象
  font = ImageFont.truetype('Arial.ttf',32)
  #创建Draw对象
  draw = ImageDraw.Draw(image)
  #随机颜色填充每个像素
  for x in range(width):
    for y in range(height):
      draw.point((x,y),fill=random_color(64,255))
  #验证码
  code = random_code(lenght)
  #随机颜色验证码写到图片上
  for t in range(lenght):
    draw.text((40*t+5,5),code[t],font=font,fill=random_color(32,127))
  #模糊滤镜
  image = image.filter(ImageFilter.BLUR)
  return code,image

views.py

from . import vericode.py
from io import BytesIO
from django.http import HttpResponse

def verify_code(request):
  f = BytesIO()
  code,image = vericode.veri_code()
  image.save(f,'jpeg')
  request.session['vericode'] = code
  return HttpResponse(f.getvalue())

def submit_xxx(request):
  if request.method == "POST":
    vericode = request.session.get("vericode").upper()
    submitcode = request.POST.get("vericode").upper()
    if submitcode == vericode:
      return HttpResponse('ok')
  return HttpResponse('error')