text: from django.db import models
  from django.contrib.auth.models import AbstractUser
  
  
  class User(AbstractUser):
      USER_TYPE_CHOICES = (
          ("student", "Student"),
          ("faculty", "Faculty"),
          ("coordinator", "Coordinator")
      )
      enrolment_number = models.CharField(max_length=20, blank=True, null=True)
      user_type = models.CharField(
          max_length=30,
          blank=True, null=True,
          choices=USER_TYPE_CHOICES)
      semester = models.IntegerField(null=True, blank=True)
  