What should I test before moving to Python 3.15?
Run the suite on the new interpreter, check import-time side effects and deferred failures if using lazy imports, and test files that rely on platform-default encodings. Python 3.15 makes UTF-8 the default, which can expose assumptions that previously followed a locale-specific encoding.
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Python 3.15 Makes Lazy Imports Explicit and UTF-8 the DefaultThe new stable release adds opt-in lazy imports and changes the default text encoding, creating two different migration checks for Python teams.
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