如何扩展我的Django默认UserCreationForm？

from django import forms
from django.contrib.auth.forms import UserCreationForm

class CustomUserCreationForm(UserCreationForm):
    phone_number = forms.CharField(max_length=20)

from django import forms
from django.contrib.auth.forms import UserCreationForm

class CustomUserCreationForm(UserCreationForm):
    phone_number = forms.CharField(max_length=20)

    def clean_phone_number(self):
        phone_number = self.cleaned_data.get('phone_number')
        # 进行手机号码验证的逻辑
        return phone_number

from django.shortcuts import render
from .forms import CustomUserCreationForm

def register(request):
    if request.method == 'POST':
        form = CustomUserCreationForm(request.POST)
        if form.is_valid():
            # 处理表单数据
            form.save()
            return render(request, 'registration/success.html')
    else:
        form = CustomUserCreationForm()
    return render(request, 'registration/register.html', {'form': form})