ImportError:无法导入名称cygrpc

我正在尝试在Google App Engine-Standard上使用Firebase本机模式.我的python语言是Python 2.7.当我尝试从google.cloud导入firestore时，出现错误ImportError:无法导入名称cygrpc

I am trying to use Firebase Native mode on Google App Engine - Standard. My python language is Python 2.7. When I try to from google.cloud import firestore, I get an error ImportError: cannot import name cygrpc

我已经部署了文档此处中所述的virtualenv.

I have deployed virtualenv described in the documentation here.

pip install virtualenv
virtualenv env
source env/bin/activate

我的appengine_config.py是

My appengine_config.py is

from google.appengine.ext import vendor
import os.path

# Add any libraries installed in the "lib" folder.
vendor.add('lib')
vendor.add(os.path.join(os.path.dirname(os.path.realpath(__file__)), 'lib'))

my_app.py包含

my_app.py includes

from google.appengine.ext.webapp import template
from google.appengine.ext import ndb
from google.appengine.api import mail

import os

from google.cloud import firestore



(/base/alloc/tmpfs/dynamic_runtimes/python27g/43d5822312de17fd/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py:269)
Traceback (most recent call last):
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/43d5822312de17fd/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 240, in Handle
    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/43d5822312de17fd/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 311, in _LoadHandler
    handler, path, err = LoadObject(self._handler)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/43d5822312de17fd/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 85, in LoadObject
    obj = __import__(path[0])
  File "/base/data/home/apps/s~openbarn-prod/20190602t102855.418624175446659791/main.py", line 4, in <module>
    from controllers import server, common, header
  File "/base/data/home/apps/s~openbarn-prod/20190602t102855.418624175446659791/controllers/server.py", line 10, in <module>
    from google.cloud import firestore
  File "/base/data/home/apps/s~openbarn-prod/20190602t102855.418624175446659791/lib/google/cloud/firestore.py", line 18, in <module>
    from google.cloud.firestore_v1 import __version__
  File "/base/data/home/apps/s~openbarn-prod/20190602t102855.418624175446659791/lib/google/cloud/firestore_v1/__init__.py", line 22, in <module>
    from google.cloud.firestore_v1._helpers import GeoPoint
  File "/base/data/home/apps/s~openbarn-prod/20190602t102855.418624175446659791/lib/google/cloud/firestore_v1/_helpers.py", line 21, in <module>
    import grpc
  File "/base/data/home/apps/s~openbarn-prod/20190602t102855.418624175446659791/lib/grpc/__init__.py", line 23, in <module>
    from grpc._cython import cygrpc as _cygrpc
ImportError: cannot import name cygrpc

我有一个问题-您可以使用Python 2.7在Google App Engine标准上使用Firestore本机模式吗?我需要GAE-Standard，因为我们正在使用GAE-Flex不支持的Google端点.

The question I have - can you use Firestore Native mode on Google App Engine Standard using Python 2.7? I need GAE- Standard because we are using Google Endpoint that is not support on GAE-Flex.

文档此处表示App Engine客户端库集成不是在Python2.7 GAE Standard环境上受支持.但是我没有尝试使用App Engine客户端库，而是尝试在GAE标准环境中使用App Engine服务器库.如何解决cygrpc的导入错误?解决方案此处，说-

The doc here says App Engine Client library integration is not supported on Python2.7 GAE Standard environment. But I am not trying App Engine Client library, I am trying App Engine Server library in GAE Standard Environment. How do I solve for import error for cygrpc? The solution here, says -

python -m pip install grpcio --ignore-installed

这是推荐的吗?