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I had always thought that BytesIO.getvalue() copied all the memory. Turns out I was wrong, and the CPython developers had a trick up their sleeves.
https://pythonspeed.com/articles/bytesio-reduce-memory-usage/
Python⇒Speed · The surprising way to save memory with BytesIOIf you want to save memory when reading from a BytesIO, getvalue() is surprisingly a good choice.
@itamarst Very interesting. I work a lot with Python, and often go exploring in the CPython source. 
Small note: 3.10 reaches EOL in 2026, not 2027.
@itamarst Thanks, TIL!
