New submission from Terry J. Reedy: sys.stdin on 3.4.1 is also 'missing' (among public names) 'line_buffering' (True) and 'mode' ('r'). It seems that these could be trivially added, so the focus of this issue is 'buffer'. The associated .detach method is a no-op, (It is also a bit dangerous for interactive operation.) 3.4.1 Console interpreter:

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import sys; b = sys.stdin.buffer.readline() a line b b'a line\r\n'

3.4.1 Idle:

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import sys; b = sys.stdin.buffer.readline() Traceback (most recent call last): File "<pyshell#2>", line 1, in <module> import sys; b = sys.stdin.buffer.readline() AttributeError: 'PseudoInputFile' object has no attribute 'buffer'

https://docs.python.org/3/library/sys.html#sys.stdin presents the idiom. It also warns (too narrowly -- 'if you are writing a library ...') that it might not. As far as I could find, the Idle doc does not mention the standard streams, let alone Idle specific limitations. I intentionally wrote the title as a statement of a problematical situation, rather than as a proposed solution, as there are two: change code and change doc. Code: add .buffer as a bytes-oriented Pseudofile. Doc: at least mention that standard streams are replaced by objects that ship text between processes, and use gui for input and display, and the consiquences of this. ---------- assignee: docs@python components: Documentation, IDLE messages: 223292 nosy: docs@python, terry.reedy priority: normal severity: normal stage: test needed status: open title: Idle: pseudofiles have no buffer attribute. type: enhancement versions: Python 2.7, Python 3.4, Python 3.5 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue21995> _______________________________________