Much of the work of major software upgrades can now be automated via “codemods” - software that modifies other software’s source code (source code modification). Here is a collection of such codemods that either have saved us time in previous upgrades or seem likely to do so in future ones. For more context on many of these, see Herding Ponies: Coordinating and Automating Django Upgrades Across 100+ Repositories .

Applying Codemods Across Multiple Repositories

• https://github.com/edx/.github/blob/master/.github/workflows/bulk_repo_update.yml

Continuous Integration

• https://github.com/edx/repo-tools/tree/master/edx_repo_tools/codemods/django3 - Examples for auto-updating GitHub Actions workflows, tox.ini, and .travis.yml

Django

• https://github.com/adamchainz/django-upgrade

• https://github.com/browniebroke/django-codemod

• https://github.com/edx/repo-tools/tree/master/edx_repo_tools/codemods

• New options may appear in Django Packages : Auto-Upgrade

Python

• GitHub - asottile/pyupgrade: A tool (and pre-commit hook) to automatically upgrade syntax for newer versions of the language.

Codemod Frameworks - Python

• Fixit 2: Meta’s next-generation auto-fixing linter (built on LibCST)

• GitHub - Instagram/LibCST: A concrete syntax tree parser and serializer library for Python that preserves many aspects of Python's abstract syntax tree

• GitHub - facebookincubator/Bowler: Safe code refactoring for modern Python. - deprecated/inactive

• GitHub - google/pasta: Library to refactor python code through AST manipulation. - inactive

• GitHub - PyCQA/redbaron: Bottom-up approach to refactoring in python - inactive

Deprecation Warnings Classification - Python

• https://github.com/edx/edx-platform/blob/master/openedx/core/process_warnings.py

• GitHub - openedx/pytest-warnings-report: Create an aggregate report of the warnings seen during test runs. (incomplete refactoring of the edx-platform code above to make it usable in other repos)