[issue15295] Import machinery documentation

[Barry A. Warsaw]

Barry A. Warsaw added the comment:

On Jul 31, 2012, at 03:21 AM, Eric Snow wrote:

>1. default path importer (a.k.a PathFinder),

+1, although currently I am refraining from using "default" when describing
this thing.

>2. path hook (lives on sys.path_hooks),

I have called these "path entry hooks"

>3. path entry handler (finder look-alike that a path hook returns),

I still call these "path entry finders".  I understand the ambiguity, and
despite supporting a slightly different protocol than meta path finders, they
still serve the role of finding a loader for a module.  So for now, I'm
keeping "path entry finder", though I'll leave the door slightly open to
persuasion. :)

>4. module loader (business as usual).

I've pulled "Loaders" out into a separate higher level section because as you
say, the loader API is the same for the things returned by both meta path
finders and path entry finders.

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