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stdoutis line-buffered by default whereasstderris unbuffered, sostderris the natural choice for writing progress text / bars / spinners that don't contain a newline. (If you write such text onstdoutyou need to clutter up your progress output calls withstdout.flush()to make it visible).stdout, you need to flush even if your text does contain a newline if you want your progress reports to actually show up in real time when redirected.