[docs] [issue21763] Clarify requirements for file-like objects
R. David Murray
report at bugs.python.org
Sun Jun 15 17:29:34 CEST 2014
R. David Murray added the comment:
I don't think that's true, though. "file like" pretty much means "has the file attributes that I actually use". That is, it is context dependent (duck typing).
I'm also not sure I see the point in the change. It is inherent in the definition of what ABCs are. I think the language should be audited for imperative/prescriptive voice, though:
Flush and close this stream. If called again, do nothing. Once the file is closed, any operation on the file (e.g. reading or writing) should raise a ValueError.
My use of 'should' there might be controversial, though, since in the default implementation 'will' is correct. If 'will' is kept, then perhaps some variation of your note would be appropriate.
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