[issue15295] Import machinery documentation

[Barry A. Warsaw]

Barry A. Warsaw added the comment:

On Jul 29, 2012, at 05:10 AM, Nick Coghlan wrote:

>I would title the new section "Import system" rather than "Import machinery"
>as it is meant to be a specification documentation rather than an
>implementation description.

"Import system" it is.

>The statement that "from X import A" only performs a single import lookup is
>incorrect. The trick is that if A, B or C refers to a submodule of X then it
>will be imported.

I think I see where you and Eric are coming from on this.  Actually, I don't
think I changed the existing text in this regard, but probably once I
refactored out all the details, it reads in such a way as to be confusing.
I've tweaked the text under the import statement to hopefully be more clear.
It could probably still use improvement.

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