New submission from Dolda2000:
It seems open() is slightly broken in Python 3, in that one cannot open
non-seekable files in read-write mode. One such common use is open("/dev/tty",
"r+") for interacting directly with the controlling TTY regardless of standard
stream redirections. Note that this is a regression for Python 2, where this
worked as expected.
What happens is the following:
>>> open("/dev/tty", "r+")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
io.UnsupportedOperation: File or stream is not seekable.
Just for the record, the same thing happens with "w+" and "rb+".
This also means that the getpass module is slightly broken, since it will
always fail whenever stdin is redirected.
----------
components: IO
messages: 206957
nosy: Dolda2000
priority: normal
severity: normal
status: open
title: open() of read-write non-seekable streams broken
type: behavior
versions: Python 3.1, Python 3.3
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Python tracker <[email protected]>
<http://bugs.python.org/issue20074>
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