[issue17404] ValueError: can't have unbuffered text I/O for io.open(1, 'wt', 0)

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

The proposed workaround seems to work ("wb" instead of "wt"!), with the following restrictions:

- it's not really unbuffered: the encoder has its own buffers (OK, in the stdlib only 'idna' encoding will retain data)

- it won't work for reading: TextIOWrapper calls the read1() method, which is only defined by BufferedIO objects.

IMO this explains why it's not a supported combination in io.open().

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue17404>
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