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Joshua Lock 71de3f64ef ADR: only use Python 3.6+

Document the decision drop support for EOL Python versions, most notable
Python 2.7

Fixes #1125

Signed-off-by: Joshua Lock <jlock@vmware.com>

2020-10-26 16:26:52 +00:00

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Default to Python 3.6 or newer for new development

Status: accepted
Date: 2020-10-20

Technical Story: https://github.com/theupdateframework/tuf/issues/1125

Context and Problem Statement

We do not want to try and support end-of-life versions of the language. We want to use modern language features, such as typing. We want to ease maintainer burden, by reducing the major language versions supported.

Decision Drivers

Python 2.7 is end-of-life
Python 3.5 is end-of-life
Modern Python allows use of desirable features such as type hints
Supporting end-of-life Python versions adds maintenance overhead

Considered Options

Support Python 2.7 and 3.5+
Support Python 2.7 and 3.6+
Support Python 2.7 and 3.6+ (with polyfill modules)
Support only Python 3.6+

Decision Outcome

Chosen option: "Support only Python 3.6+", because we want modern features and lower maintainer effort as we work to improve our codebase through the refactor effort.

Using modules to polyfill standard library features from Python 3.6+ feels untenable as more libraries are dropping support for EOL Python releases.

Negative Consequences

Leaves major adopter and contributor without an actively developed client for some of their customers stuck on older Python versions.

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