On: Django Newbie Mistakes

[ubernostrum]

The 'meta' there indicates that you're looking at something properly ancient. The ORM stuff in 'meta' is from the Django 0.9x era, meaning 2006.

If you want to store a US zip code today, use the 'localflavor' add-on:

https://django-localflavor.readthedocs.io/en/latest/

Which provides model and form fields and validation for various country-specific data types. It includes a US zip code field.