How can I use GNU readline when the value of sys.stdin has been changed?

[Skaperen]

in a recent project i needed to redirect stdout and stderr.  the way i did it was to use os.open() to open a new POSIX file descriptor then use a couple calls to os.dup2() to change descriptors 1 and 2.  i just made sure i did stdout,flush() ahead of this.  maybe you can do this for stdin (0).  be sure you have empty buffers to avoid mixed data.

stdout.flush()
fd = os.open(ln,os.O_APPEND|os.O_CREAT|os.O_WRONLY)
os.dup2(fd,1) if fd != 1 else None
os.dup2(1,2)

"ln" means "log name".  this is opening log files for several cloud programs.