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Code style and design

Cloud-init adheres to PEP 8, and this is enforced by CI tests.

Python support

Cloud-init upstream currently supports Python 3.9 and above.

Cloud-init upstream will stay compatible with a particular Python version for 6 years after release. After that, upstream will stop testing upstream changes against the unsupported version of Python and may introduce breaking changes.

The following table lists the cloud-init versions in which the minimum Python version changed:

Cloud-init version	Python version
25.4	3.9+
24.3	3.8+
22.1	3.6+
20.3	3.5+
19.4	2.7+