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Define "backwards incompatibility"

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Brett Cannon 2020-06-16 12:47:42 -07:00 committed by GitHub
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pep-0387.txt
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@ -27,6 +27,13 @@ millions of applications and libraries. This is fantastic. However, it
means the development team must be very careful not to break this
existing 3rd party code with new releases.
This PEP takes the perspective that "backwards incompatibility" means
preexisting code ceases to comparatively function after a change. It is
acknowledged that this is not a concrete definition, but the expectation
is people in general understand what is meant by
"backwards incompatibility", and if they are unsure they may ask the
Python development team and/or steering council for guidance.
Backwards Compatibility Rules
=============================