[issue20074] open() of read-write non-seekable streams broken

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Use unbuffered binary file.

>>> open("/dev/tty", "r+b", buffering=0)
<_io.FileIO name='/dev/tty' mode='rb+'>

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20074>
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