Python 3.15 defaults to UTF-8 for character encoding. Changes on Windows

On October 9, 2026, Python 3.15.0 was released. When opening a file with open() without specifying a character encoding, it now reads and writes in UTF-8 regardless of OS settings.The impact is ...

Python Japanese Character Corruption on Windows: Adding -I caused PYTHONUTF8=1 to be ignored, reverting the same single-line output to cp932

Yu, and while I'm a student, I'm also launching multiple AI-based businesses. Today, I'm writing about a time when Japanese ...
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Python 3.15 Released With Experimental JIT Compiler Running Faster

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