Django 登录验证码判断

from django.shortcuts import render
from django.http import HttpResponse
from django.shortcuts import redirect
from django.urls import reverse
from myadmin.models import User
# 验证码
def verify(request):
    # 引入随机函数模块
    import random
    from PIL import Image, ImageDraw, ImageFont
    # 定义变量，用于画面的背景色、宽、高
    # bgcolor = (random.randrange(20, 100), random.randrange(
    #    20, 100),100)
    bgcolor = (242, 164, 247)
    width = 100
    height = 25
    # 创建画面对象
    im = Image.new('RGB', (width, height), bgcolor)
    # 创建画笔对象
    draw = ImageDraw.Draw(im)
    # 调用画笔的point()函数绘制噪点
    for i in range(0, 100):
        xy = (random.randrange(0, width), random.randrange(0, height))
        fill = (random.randrange(0, 255), 255, random.randrange(0, 255))
        draw.point(xy, fill=fill)
    # 定义验证码的备选值
    # str1 = 'ABCD123EFGHIJK456LMNOPQRS789TUVWXYZ0'
    str1 = '0123456789'
    # 随机选取4个值作为验证码
    rand_str = ''
    for i in range(0, 4):
        rand_str += str1[random.randrange(0, len(str1))]
    # 构造字体对象，ubuntu的字体路径为“/usr/share/fonts/truetype/freefont”
    font = ImageFont.truetype('static/arial.ttf', 21)
    # font = ImageFont.load_default().font
    # 构造字体颜色
    fontcolor = (255, random.randrange(0, 255), random.randrange(0, 255))
    # 绘制4个字
    draw.text((5, -3), rand_str[0], font=font, fill=fontcolor)
    draw.text((25, -3), rand_str[1], font=font, fill=fontcolor)
    draw.text((50, -3), rand_str[2], font=font, fill=fontcolor)
    draw.text((75, -3), rand_str[3], font=font, fill=fontcolor)
    # 释放画笔
    del draw
    # 存入session，用于做进一步验证
    request.session['verifycode'] = rand_str
    """
    python2的为
    # 内存文件操作
    import cStringIO
    buf = cStringIO.StringIO()
    """
    # 内存文件操作-->此方法为python3的
    import io
    buf = io.BytesIO()
    # 将图片保存在内存中，文件类型为png
    im.save(buf, 'png')
    # 将内存中的图片数据返回给客户端，MIME类型为图片png
    return HttpResponse(buf.getvalue(), 'image/png')

<input type="text" class="form-control" name = 'code' style="width:150px" placeholder="验证码">
<span class="form-control-feedback" style="width:150px">
    <img src="{% url 'myadmin_verify' %}" onclick="this.src = '{% url 'myadmin_verify' %}?sn='+Math.random()"/>
</span>

配置路由
path('verify', index.verify, name="myadmin_verify"),  #  验证码

# 执行管理员登录
def dologin(request):
    try:
        #执行验证码验证
        if request.POST['code'] != request.session['verifycode']:
            context = {"info": '验证码错误，请重新输入'}
            return render(request, 'myadmin/index/login.html', context)
        user = User.objects.get(username=request.POST['username'])
        # 判断当前用户是否是管理员
        if user.status == 6:
            # 判断密码相同
            import hashlib
            md5 = hashlib.md5()
            s = request.POST['pass'] + user.password_salt
            md5.update(s.encode('utf-8'))
            if user.password_hash == md5.hexdigest():
                # 将当前登录成功的用户信息以adminuser为key存入到session中
                request.session['adminuser'] = user.toDict()
                return redirect(reverse("myadmin_index"))
            else:
                context = {"info": '密码错误，请重新输入'}
        else:
            context = {"info": '无效的登录账号'}
    except Exception as err:
        print(err)
        context = {"info": '登录账号不存在'}
    return render(request, 'myadmin/index/login.html', context)