Emil Styrke added the comment: eryksun, thank you for the explanation, the penny finally dropped for me. It's the *other* child processes that keep the file open, not the parent. Actually this bug started hitting me after I *stopped* doing exactly what you suggest (fdopen on the temp file), and instead started using file names generated by my program (opened with regular "open") and now I see why that is. If I use os.fdopen with the O_NOINHERIT flag, it works as expected.
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