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Some more use cases for temporarily switching error handler in the middle of writing to a stream:
* Possibly simplify the implementation of sys.displayhook()
* I have done a similar hack at <https://bitbucket.org/Gfy/pyrescene/commits/42ad75e375d84e090a32d024acc865de341c22aa#Lrescene/srr.pyF132>, to output a comment field with a permissive error handler, while other data is output with strict error handling.
A use case for changing a reader’s newline translation mode is to use standard input with the built-in "csv" module. My current idea is to do something like this:
encoding = sys.stdin.encoding
errors = sys.stdin.errors
line_buffering = sys.stdin.line_buffering
# No way to retain write_through mode, but shouldn’t matter for reading
sys.stdin = TextIOWrapper(sys.stdin.detach(), encoding, errors,
 newline="", line_buffering=line_buffering)
for row in csv.reader(sys.stdin):
 ...
On the other hand, I wonder about rewinding an input file after already having read and buffered text in the wrong encoding. From a distance, the Python native version of the code seems rather complex and full of dark magic. Is there a use case, or maybe it would be simpler to have it only work when nothing has been read or buffered?