How to capture botocore”s NoSuchKey exception?

I"m trying to write "good" python and capture a S3 no such key error with this:

session = botocore.session.get_session()
client = session.create_client("s3")
try:
    client.get_object(Bucket=BUCKET, Key=FILE)
except NoSuchKey as e:
    print >> sys.stderr, "no such key in bucket"

But NoSuchKey isn"t defined and I can"t trace it to the import I need to have it defined.

e.__class__ is botocore.errorfactory.NoSuchKey but from botocore.errorfactory import NoSuchKey gives an error and from botocore.errorfactory import * doesn"t work either and I don"t want to capture a generic error.