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It would be nice if the first sentence of the documentation for the open() built-in function:
"Open file and return a corresponding stream. If the file cannot be opened, an OSError is raised."
http://docs.python.org/dev/library/functions.html#open
linked to the glossary entry for "file object":
http://docs.python.org/dev/glossary.html#term-file-object
Incidentally, this would be similar to what was done 2.7 documentation of open():
http://docs.python.org/library/functions.html#open
Similarly, the introductory overview section of the io module should also link to the glossary entry for "file object":
"Concrete objects belonging to any of these categories will often be called streams; another common term is file-like objects."
(from http://docs.python.org/dev/library/io.html#overview )