Per Wagner Nielsen's Blog

How does Django's select_related works and when should you use it?

What problem does it solve?

Django's select_related() solves the problem when you want to access related fields on a queryset. Assume the models:

from django.db import models


class Author(models.Model):
    name = models.CharField(max_length=250)


class Book …

This blog post will show how IP addresses work, what subnetting is.

Binary to decimal for two byte numbers

First, it can be beneficial to memorize the following table, which is just a list of binary digits.

128  64  32  16  8  4  2  1

It makes it easy to …