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Provide additional context to clarify where we expect Python 3.6+ to be used exclusively (new modules) and link to other discussions around the future of Python 2.7 supporting code. Signed-off-by: Joshua Lock <jlock@vmware.com>
48 lines
1.6 KiB
Markdown
48 lines
1.6 KiB
Markdown
# Default to Python 3.6 or newer for new development
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* Status: accepted
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* Date: 2020-10-20
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Technical Story: https://github.com/theupdateframework/tuf/issues/1125
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## Context and Problem Statement
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We are planning a refactor of tuf where:
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* We do not want to try and support end-of-life versions of the language.
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* We want to use modern language features, such as typing.
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* We want to ease maintainer burden, by reducing the major language versions supported.
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## Decision Drivers
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* Python 2.7 is end-of-life
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* Python 3.5 is end-of-life
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* Modern Python allows use of desirable features such as type hints
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* Supporting end-of-life Python versions adds maintenance overhead
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## Considered Options
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* Support Python 2.7 and 3.5+
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* Support Python 2.7 and 3.6+
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* Support Python 2.7 and 3.6+ (with polyfill modules)
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* Support only Python 3.6+
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## Decision Outcome
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Chosen option: "Support only Python 3.6+", because we want modern features and lower
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maintainer effort as we work to improve our codebase through the refactor effort.
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New modules should target Python 3.6+.
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Using modules to polyfill standard library features from Python 3.6+ feels
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untenable as more libraries are dropping support for EOL Python releases.
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### Negative Consequences
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* Leaves major adopter and contributor without an actively developed client for some of
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their customers stuck on older Python versions.
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## Links
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* [Discussion of how/where to develop the refactored codebase](https://github.com/theupdateframework/tuf/issues/1126)
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* [Discussion of deprecation policy for the pre-1.0, Python 2.7 supporting, code](https://github.com/theupdateframework/tuf/issues/1127)
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