New submission from Martin Panter:
>>> f = open("/dev/stdout", "w+b") # Or any non-seekable file, pipe, etc
__main__:1: ResourceWarning: unclosed file <_io.FileIO name='/dev/stdout'
mode='rb+'>
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
io.UnsupportedOperation: File or stream is not seekable.
It is mainly just the annoyance of the ResourceWarning, so nothing major. I
think this was previously identified in Issue 18116, but it looks like that bug
was side-stepped by removing an equivalent fdopen() call.
No ResourceWarning happens with an unbuffered file. I haven’t looked at the
code but I guess the UnsupportedOperation might only be raised after trying to
wrap the open FileIO object in a BufferedWriter object.
----------
components: IO
messages: 216838
nosy: vadmium
priority: normal
severity: normal
status: open
title: ResourceWarning when open() fails with io.UnsupportedOperation: File or
stream is not seekable
versions: Python 3.4
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<http://bugs.python.org/issue21310>
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