Serhiy Storchaka <[email protected]> added the comment:
Oh, this is a serious problem.
AFAIK TextIOWrapper initially supported only buffered writers, but the support
of non-buffered writers was added later. We can make TextIOWrapper calling
write() of underlying binary stream repeatedly, but it will break the code
which uses TextIOWrapper with other file-like objects whose write() method does
not return the number of written bytes. For example:
buffer = []
class Writer: write = buffer.append
t = TextIOWrapper(Writer())
Even if we fix writing sys.stdout and sys.stderr there will be a problem with
programs which write directly to sys.stdout.buffer or use open(buffering=0).
This is a complex issue and it needs a complex solution.
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<https://bugs.python.org/issue41221>
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