only_access_token.py

from django.contrib.auth import get_user_model
from rest_framework_simplejwt.serializers import TokenObtainSerializer
from rest_framework_simplejwt.tokens import RefreshToken


class MyTokenObtainSerializer(TokenObtainSerializer):
    @classmethod
    def get_token(cls, user):
        return RefreshToken.for_user(user)

    def validate(self, attrs):
        data = super().validate(attrs)

        refresh = self.get_token(self.user)

        data['access'] = str(refresh.access_token)

        return data

def main():
    User = get_user_model()
    user = User.objects.last()
    user.set_password('Asdf1321!')
    user.save()

    data = {
            'username': user.username,
            'password': 'Asdf1321!'
    }

    serializer = MyTokenObtainSerializer(data=data)
    serializer.is_valid(raise_exception=True)
    print(serializer.validated_data)