Document mentions AsyncResult but there is no such class.
http://docs.python.org/2/library/multiprocessing.html#multiprocessing.pool.AsyncResult

You can check it by simply running:
python -c 'from multiprocessing.pool import AsyncResult'

I think it means ApplyResult so I made a patch (attached).

Note that there managers.py also uses name 'AsyncResult':
% hg grep AsyncResult
Doc/library/multiprocessing.rst:83232:.. class:: AsyncResult
Lib/multiprocessing/managers.py:81039:    'apply_async': 'AsyncResult',
Lib/multiprocessing/managers.py:81039:    'map_async': 'AsyncResult',
Lib/multiprocessing/managers.py:81039:    'starmap_async': 'AsyncResult',
Lib/multiprocessing/managers.py:81039:SyncManager.register('AsyncResult', create_method=False)

Probably renaming them would be better?

It might be simplest to make the implementation match the docs by making AsyncResult an alias for ApplyResult.

New changeset 2684176519ef by Richard Oudkerk in branch '2.7':
Issue #17805: Add AsyncResult alias for ApplyResult
http://hg.python.org/cpython/rev/2684176519ef

New changeset bb4bb2db6106 by Richard Oudkerk in branch '3.3':
Issue #17805: Add AsyncResult alias for ApplyResult
http://hg.python.org/cpython/rev/bb4bb2db6106

The documentation here: https://docs.python.org/3/library/multiprocessing.html#module-multiprocessing.pool
says that apply_async is "A variant of the apply() method which returns a result object."
You should replace "a result object" with "a AsyncResult/ApplyResult object" and a link to https://docs.python.org/2/library/multiprocessing.html#multiprocessing.pool.AsyncResult

Hi Volker Weißmann, this issue has been closed for 7 years, if you want to propose a change, please open a new issue.

Tomorror, or in a few days, I'm gonna create a pullrequest for it.