import sys import time import os def REPEAT (): print ("REPEAT, STDERR", file = sys.stderr) print ("REPEAT, STDOUT", file = sys.stdout) #sys.stdout.buffer.write (b"A FEW BYTES") with os.fdopen (sys.stdout.fileno (), "wb", closefd = False) as STDOUT: STDOUT.write (b"A FEW BYTES\n") STDOUT.flush () time.sleep (1) REPEAT () REPEAT ()