[Python] Incremento Automatico em models.py Django

Boa tarde,

Estou aprendendo agora Django estou com uma situação talvez simples mas que eu nao estou conseguindo resolver.

No meu models.py eu estou fazendo um cadastro de clientes e gostaria que quando a pessoa fizesse o cadastro, gerasse um numero automático tipo: 1001, 1002...

Tem como fazer isso?

meu models.py

from django.db import models
from djmoney.models.fields import MoneyField
from phonenumber_field.modelfields import PhoneNumberField


class NewAccount(models.Model):
"""
Models to create a new account
"""
GENDER_CHOICE = (
("M", "Male"),
("F", "Female"),
)

objects = None

account_id = models.AutoField(primary_key=True)
name = models.CharField(max_length=50, blank=False)
surname = models.CharField(max_length=50, blank=False)
phone = PhoneNumberField()
email = models.EmailField(max_length=30, blank=False)
title = models.CharField(max_length=1, choices=GENDER_CHOICE)
income = MoneyField(max_digits=10, decimal_places=2, default_currency='GBP')
password = models.CharField(max_length=200, blank=False)


essa e minha views.py

def user_view(request):

if request.method == "POST":
user_form = UserForm(request.POST)

if user_form.is_valid():
user_form.save()

else:
form = {
"user_form": user_form,
}

return render(request, 'sign.html', form)

user = UserForm()

return render(request, 'sign.html', {
'user_form': user
})


e o forms.py

from django import forms
from phonenumber_field.widgets import PhoneNumberPrefixWidget
from bank.models import NewAccount


class UserForm(forms.ModelForm):
objects = None

class Meta:
model = NewAccount
widgets = {
'password': forms.PasswordInput,
'phone': PhoneNumberPrefixWidget(initial='GB'),
}
fields = '__all__'

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