Importerror: No module named 'django.core.urlresolvers'

Deep dive: The 'why' behind the change

The django.core.urlresolvers was deprecated in Django version 1.10 and subsequently axed in version 2.0. This is a part of Django's evolution, holding the mantle for more efficient code and clarity. Upgrading an existing Django app? Stay on top of these changes. It impacts not only the location of reverse and reverse_lazy functions but also other aspects of URL and view handling.

Preparing for the big leap - Migrating to Django 2.0

Django 2.0 brings along a caravan of changes:

1. Refactor URL patterns: Switch from url() to path() or re_path() for crystal clear code.
2. Tighten middleware: Check if custom middleware are at odds with MiddlewareMixin.
3. Refit model fields: Some field types now don a new hat.
4. Modify view functionalities: March of the mixins - class-based views require different strides.

Don't skip the Django 2.0 release notes! It's your treasure map to all deprecated features and updates.

Putting the coding gloves on: Refactoring tips

Left hook, right hook, and jab your way through the upgrade process:

• PyCharm's Superpowers: Fancy a superhero gadget? Try PyCharm. Its refactoring utilities can sniff out obsolete references and autocorrect them across your project.
• Virtual Environments: Call on virtualenv or pipenv to don the cape. Manage your project's dependencies in isolated spaces, keeping Django installations from different projects separate.

Safeguarding the transition

Keep your eyes on the ball during the transition and focus on these areas:

The Python-Django compatibility matrix

Make sure your Python version is on the guest list for the Django version you are upgrading to. For example, the Django 2.0 party only allows Python version 3.5.2 and later. Crashers can cause chaos!

Resolving the Reverse and Reverse_lazy confusion

Jazz up your imports:

from django.urls import reverse, reverse_lazy


This swap solves the ImportError and streams your project inline with current conventions. Smooth.

The Django documentation marathon

For professional developers, official documentation is a lifeline. Drink from the infinite well of Django documentation across all releases from your project's current to the target version. Therein lies the key to migration guides, compatibility g(o/u)rudges, and API additions.