Steven Hiscocks added the comment: I agree in part, but it's quite common to close fd's in some cases like in a child process after using "os.fork()". There is no way, as far as I'm aware, to identify which fd is associated with /dev/urandom to keep it open; or anyway to reopen it such that other libraries which depend on it can use it (for example "tempfile.TemporaryFile").
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