Implementation of django registration with email to send verification code

lis = []# Set up an empty list to hold sent captchas for verification
def yzm1():
    res1 = ""
    for i in range(4):#Captcha with four random numbers
        num = (0, 9)
        res1 += str(num)
    (res1)#Put CAPTCHA into an empty list
    return res1#Return to CAPTCHA
class zc(View):
    def get(self, request):
        return render(request, '', locals())
    def post(self, request):
        name = ['qq']# Get the data passed in from the front end
        subject = 'CAPTCHA'
        message = vercode()#GetCAPTCHA
        form = '837620306@'# Get the email to which the captcha was sent
        # EMAIL_HOST_USER
        rcipient_list = [name]
        res = send_mail(subject=subject, message=message, from_email=form, recipient_list=rcipient_list)#Send CAPTCHA return goods true or false, false means not sent successfully
        if res == 1:# Determine if the send was successful
            return redirect('/app01/yzm/')#If successful, you will be redirected to the verification page
        else:# Return to the registration screen if unsuccessful
            return render(request, '', locals())
def yzm2(request):
    if  == 'GET':
        return render(request, '', locals())
    elif  == 'POST':
        a = ['much']# Get the captcha entered by the user
        if a == lis[-1]:# Fetch the latest CAPTCHA
            return HttpResponse('Captcha is correct')
        else:
            return HttpResponse('no')

# Set up the sending mail server:.
EMAIL_HOST = ''
# Set the port number, 465 or 587 if SSL is being used.
EMAIL_PORT = 25
#Set the sender's mailbox
EMAIL_HOST_USER = 'xxxxx'
# Set sender authorization code (authorization code for POP3/SMTP service)
EMAIL_HOST_PASSWORD = 'xxxxx'
# Set whether to enable secure links
EMAIL_USER_TLS = True