stream.flush() doesn't mean final output.
Try stream.close()
2023年6月20日(火) 1:40 Jon Ribbens via Python-list <python-list@python.org>:
> io.TextIOWrapper() wraps a binary stream so you can write text to it.
> It takes an 'encoding' parameter, which it uses to look up the codec
> in the codecs registry, and then it uses the IncrementalEncoder and
> IncrementalDecoder classes for the appropriate codec.
>
> The IncrementalEncoder.encode() function is given the object to encode
> of course, and also an optional second parameter which indicates if
> this is the final output.
>
> The bug is that TextIOWrapper() never sets the second parameter to
> indicate that the output is complete - not even if you call close().
>
> Example:
>
> >>> import io
> >>> buffer = io.BytesIO()
> >>> stream = io.TextIOWrapper(buffer, encoding='idna')
> >>> stream.write('abc.example.com')
> 15
> >>> stream.flush()
> >>> buffer.getvalue()
> b'abc.example.'
>
> Obviously using the 'idna' wrapper as an encoding on a stream is a bit
> unlikely, but nevertheless any other codec which cares about the 'final'
> parameter will also have this problem.
> --
> https://mail.python.org/mailman/listinfo/python-list
>
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