[Unix] Hack: Change the error-handling on a file-like stream in Python3 (e.g., sys.stdout)

stream_errorhandling_hack.py

import os
import sys

# Re-opens the file-like stream of string 'attr' in parent object 'pobj' with
# the open() builtin parameters 'args' and 'kwargs'.  Unix-specific.
#
# I would love it if there was a better way to do this and I just missed it.
def set_stream_errorh(pobj, attr, *args, **kwargs):
    obj = getattr(pobj, attr)
    fileno = obj.fileno()

    # Keep the OS file handle alive by dup'ing the fd while we close the Python
    # stream.
    fd = os.dup(fileno)
    assert fd >= 0

    obj.close()
    obj = None
    setattr(pobj, attr, None)

    # dup2 it back into its previous number and reopen the stream with the
    # error handling we wanted.
    os.dup2(fd, fileno)
    os.close(fd)

    setattr(pobj, attr, os.fdopen(fileno, *args, **kwargs))

...

# Ex:
set_stream_errorh(sys, "stdout", "w", encoding="utf-8",
    errors="surrogateescape")