Steven D'Aprano added the comment:

I agree that the documentation could be improved, but it's not really *wrong*. 
Consider a glob like "spam/[abc]/*.txt". What iglob does is conceptually closer 
to:

(1) generate the list of files matching "spam/a/*.txt" and yield them;
(2) generate the list of files matching "spam/b/*.txt" and yield them;
(3) generate the list of files matching "spam/c/*.txt" and yield them

rather than:

(1) generate the list of files matching "spam/a/*.txt";
(2) append the files matching "spam/b/*.txt";
(3) append the files matching "spam/c/*.txt";
(4) finally yield them

(see the source code here: http://hg.python.org/cpython/file/3.4/Lib/glob.py ). 
I think the documentation is trying to say that iglob doesn't *always* store 
all the matching files, without implying that it *never* stores all the 
matching files. I can't think of a clean way to explain that, so a doc patch is 
welcome.

----------
nosy: +steven.daprano

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<http://bugs.python.org/issue22167>
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