Martin Panter added the comment:
Currently, the documentation for TextIOWrapper says it is “a buffered text
stream over a BufferedIOBase binary stream.” If passing a RawIOBase
(buffering=0) file works, that seems like an undocumented accident. This is
also explicitly disallowed with open(). “Pass 0 to switch buffering off (only
allowed in binary mode)”:
>>> open("/dev/tty", "r+t", buffering=0)
ValueError: can't have unbuffered text I/O
One benefit of requiring "r+b" mode to be seekable is that if you open a pipe
for random access, it reports the error immediately, rather than after you have
half written your data and then try to seek(). But I admit this difference
between buffered=0 mode and random-access mode is obscure.
Given that seeking text streams is rather obscure (Issue 25849), and there are
sometimes problems in conjunction with writing (Issue 12215) and with
truncating (Issue 26158), it could make some sense to use BufferedRWPair in
text mode. But IMO open() is already too complicated, so I am not excited about
such a change.
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<http://bugs.python.org/issue20074>
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