On 05.05.15 21:19, Paul Moore wrote:
I want to write a string to an already-open file (sys.stdout, typically).
However, I *don't* want encoding errors, and the string could be arbitrary
Unicode (in theory). The best way I've found is
data = data.encode(file.encoding, errors='replace').decode(file.encoding)
file.write(data)
(I'd probably use backslashreplace rather than replace, but that's a minor
point).
Is that the best way? The multiple re-encoding dance seems a bit clumsy, but it
was the best I could think of.
There are flaws in this approach.
1) file.encoding can be None (StringIO) or absent (general file-like
object, that implements only write()).
2) When the encoding is UTF-16, UTF-32, UTF-8-SIG, the output will
contain superfluous byte order marks.
This is not easy problem and there is no simple solution. In particular
cases you can create TextIOWrapper(file.buffer, 'w',
encoding=file.encoding, errors='replace', newline=file.newlines,
write_through=True) and write to it, but be aware of limitations.
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