AWS boto error message ImportError: cannot import name key

>>> import boto
>>> c = boto.connect_s3()
>>> b=c.get_bucket('beaubeaubeau')
>>> from boto.s3.key import key
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name key

I am new to boto Any idea why I am getting this error?