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After a new release of one of the most downloaded Python libraries, what keeps older versions downloaded, and which explanations can the public record rule out: other libraries' version bounds, Pythons the new release no longer supports, or environments rebuilt from frozen lists?
The question
What keeps older Python library versions downloaded, and which explanations can the public record rule out?
What the record says
Unsupported Pythons cannot account for most older downloads in 32 of 37 projects; identified dependency bounds remain undetermined for 26, and frozen lists are consistent with a trace rather than measured. A separate test found day-30 shares within ten points of day 2 for most releases in 28 of 32 projects, while shares usually continued rising within that band.
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