read_commit_isolation.py

from django.db import transaction, connection
from events.models import Event


def count_events():
    with transaction.atomic():
        print(Event.objects.count())

        input()

        print(Event.objects.count())


def insert_event():
    Event.objects.create(name="test")

repeatable_read_isolation.py

from django.db import transaction, connection
from events.models import Event


def count_events_repeatable():
    with transaction.atomic():
        cursor = connection.cursor()
        cursor.execute("SET TRANSACTION ISOLATION LEVEL REPEATABLE READ")
        print(Event.objects.count())

        input()

        print(Event.objects.count())