问注册表单字段没有呈现Django

EN

from django.contrib.auth import authenticate, login, logout
from .forms import CustomUserCreationForm
def registeruser(request):
form = CustomUserCreationForm()
if request.method == "POST":
    form = CustomUserCreationForm(request, POST)
    if form.is_valid():
        user = form.save(commit=False)
        user.save()
        user = authenticate(request, username=user.username,  password=request.POST['password'])
        if user is not None:
            login(request, user)
            return redirect('home')
context = {'form' : form}
return render(request, 'signup.html', context)
urlpatterns = [
 path('signup/', registeruser, name='signup'), 
]

from django.forms import ModelForm
from django.contrib.auth.models import User 
from django.contrib.auth.forms import UserCreationForm

class CustomUserCreationForm(UserCreationForm):
  class Meta:
    model = User
    fields = ['username', 'password1', 'password2']
    def __init__(self, *args, **kwargs):
    super(CustomUserCreationForm, self).__init__(self, *args, **kwargs)
self.fields['username'].widget.attrs.update({'class' : 'form-control', 'placeholder' : 'Enter Username'})
    self.fields['password1'].widget.attrs.update({'class' : 'form-control', 'placeholder' : 'Enter Password'})
    self.fields['password2'].widget.attrs.update({'class' : 'form-control', 'placeholder' : 'Re-Enter Password'})

  <form class="text-left clearfix" method="POST">
        {% csrf_token %}
        {% for field in forms %}
          <div class="form-group">
          {{field}}
          </div>
        {% endfor %}
        <div class="text-center">
          <button type="submit" class="btn btn-main text-center">Sign UP</button>
        </div>
      </form>