验证码图片生成pillow

<div class="form-group">
                    <label for="pwd">验证码</label>
                    <div class="row">
                        <div class="col-md-6">
                            <input type="text" class="form-control" id="valid_code">
                        </div>
                        <div class="col-md-6">
                            <img width="270" height="36" id="valid_code_img" src="/get_validCode_img/" alt="">   //自动加载验证码视图函数
                        </div>
                    </div>
                </div>

<script>
    $("#valid_code_img").click(function () {
        {#console.log($(this)[0]);#}

        $(this)[0].src += "?"

    });
</script>

def create_img(request):
    img = Image.new(‘RGB‘,(270,40),color=color_yeild())  # pillow 库PIL 生成图片 color为函数生成
    draw = ImageDraw.Draw(img)
    kumo_font = ImageFont.truetype(‘static/font/kumo.ttf‘,size=32)  # 字体设置
    check_digit = ‘‘
    for i in range(5):
        random_num = str(random.randint(0,9))
        random_low_alpha = chr(random.randint(95,122))
        random_upper_alpha = chr(random.randint(65,90))
        random_char = random.choice([random_num,random_low_alpha,random_upper_alpha])
        draw.text((i*50+20,5),random_char,color_yeild(),kumo_font)
        check_digit += random_char
    # print(‘check_digit‘,check_digit)
    request.session["check"] = check_digit   #生成随机5位验证码并存入session中




    f = BytesIO()
    img.save(f,‘png‘)
    data = f.getvalue()


    # with open(‘wudi.png‘,‘wb‘) as f:
    #     img.save(f,‘png‘)
    # f = open(‘wudi.png‘,‘rb‘)
    # import json
    # data = json.dumps(img)
    return HttpResponse(data)

def color_yeild():  #生成随机的颜色（255，255，255）
    result = (random.randint(0,255),random.randint(0,255))
    return result

valid_code = request.POST.get(‘valid_code‘,None)
print(‘valid_code‘,valid_code)
# print(‘request‘,request)
check_true = request.session.get("check")
print("check_true",check_true)
if valid_code.upper() == check_true.upper():   # 去除大小写
    print(1)
    user = auth.authenticate(username=user,password=pwd)   # 自动去djangouser表中校验
    if user:
       auth.login(request,user)  # 相当于设置session 设置session的值user 设置完成后request.user就是全局的变量了直接可以随意随时随地的使用request.user进行取值
       response[‘user‘] = user.username
    else:
        response[‘msg‘]=‘密码输入错误‘
else:
    response[‘msg‘]=‘验证码错误‘
return JsonResponse(response)