cannot import name 'PersistentList'

I get the error of the subject when I try to run a file that begins
#! /usr/binpython3     
from collections import OrderedDict
from persistent import PersistentList
from persistent import Persistent

Commenting out the "from collections" line doesn't help.
"from persistent.persistence import PersistentList"  doesn't help.

Using persistent 4.2.1 and python 3.4.  Interactively, after import persistent,
>>> dir(persistent)
['CHANGED', 'GHOST', 'IPersistent', 'PURE_PYTHON', 'Persistent', 'PickleCache', 'STICKY', 'TimeStamp', 'UPTODATE', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__path__', '__spec__', '_compat', '_timestamp', 'cPersistence', 'cPickleCache', 'classImplements', 'copy_reg', 'interfaces', 'os', \
'simple_new', 'sys', 'timestamp']

The source for persistent seems to define the class in list.py, though __init__.py doesn't mention it.

Can anyone explain what's going on?

Ross


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