问google.cloud.datastore无法导入“google.cloud.datastore”

EN

from __future__ import absolute_import

import datetime
import json
import logging
import re

import apache_beam as beam
from apache_beam import combiners
from apache_beam.io.gcp.bigquery import parse_table_schema_from_json
from apache_beam.io.gcp.datastore.v1.datastoreio import ReadFromDatastore
from apache_beam.pvalue import AsDict
from apache_beam.pvalue import AsSingleton
from apache_beam.options.pipeline_options import PipelineOptions

from google.cloud.proto.datastore.v1 import query_pb2
from google.cloud import datastore
from googledatastore import helper as datastore_helper, PropertyFilter

# datastore entities that we need to perform the mapping computations
#from models import UserPlan, UploadIntervalCount, RollingMonthlyCount

$ cat requirements.txt
Flask==0.12.2
apache-beam[gcp]==2.1.1
gunicorn==19.7.1
google-cloud-dataflow==2.1.1
six==1.10.0
google-cloud-datastore==1.3.0
google-cloud

$ ls -1 lib/google/cloud
__init__.py
_helpers.py
_helpers.pyc
_http.py
_http.pyc
_testing.py
_testing.pyc
bigquery
bigtable
client.py
client.pyc
datastore
dns
environment_vars.py
environment_vars.pyc
error_reporting
exceptions.py
exceptions.pyc
gapic
iam.py
iam.pyc
language
language_v1
language_v1beta2
logging
monitoring
obselete.py
obselete.pyc
operation.py
operation.pyc
proto
pubsub
resource_manager
runtimeconfig
spanner
speech
speech_v1
storage
translate.py
translate.pyc
translate_v2
videointelligence.py
videointelligence.pyc
videointelligence_v1beta1
vision
vision_v1

(9b49615f4d91c1fb): Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/dataflow_worker/batchworker.py", line 582, in do_work
    work_executor.execute()
  File "/usr/local/lib/python2.7/dist-packages/dataflow_worker/executor.py", line 166, in execute
    op.start()
  File "apache_beam/runners/worker/operations.py", line 294, in apache_beam.runners.worker.operations.DoOperation.start (apache_beam/runners/worker/operations.c:10607)
    def start(self):
  File "apache_beam/runners/worker/operations.py", line 295, in apache_beam.runners.worker.operations.DoOperation.start (apache_beam/runners/worker/operations.c:10501)
    with self.scoped_start_state:
  File "apache_beam/runners/worker/operations.py", line 300, in apache_beam.runners.worker.operations.DoOperation.start (apache_beam/runners/worker/operations.c:9702)
    pickler.loads(self.spec.serialized_fn))
  File "/usr/local/lib/python2.7/dist-packages/apache_beam/internal/pickler.py", line 225, in loads
    return dill.loads(s)
  File "/usr/local/lib/python2.7/dist-packages/dill/dill.py", line 277, in loads
    return load(file)
  File "/usr/local/lib/python2.7/dist-packages/dill/dill.py", line 266, in load
    obj = pik.load()
  File "/usr/lib/python2.7/pickle.py", line 858, in load
    dispatch[key](self)
  File "/usr/lib/python2.7/pickle.py", line 1133, in load_reduce
    value = func(*args)
  File "/usr/local/lib/python2.7/dist-packages/dill/dill.py", line 767, in _import_module
    return getattr(__import__(module, None, None, [obj]), obj)
  File "/usr/local/lib/python2.7/dist-packages/dataflow_pipeline/counters_pipeline.py", line 25, in <module>
    from google.cloud import datastore
ImportError: No module named datastore