The following line in my Google App Engine app (webapp.py) fails to import the Google Cloud library:

from google.cloud import storage

With the following error:

ImportError: No module named google.cloud.storage

I did some research and found the following articles to be helpful:

• https://cloud.google.com/appengine/docs/python/tools/using-libraries-python-27#installing_a_library
• https://stackoverflow.com/a/34585485
• https://www.simonmweber.com/2013/06/18/python-protobuf-on-app-engine.html

Using a combination of the techniques suggested by the above articles, I did the following:

1. Create a requirements.txt file:

   google-cloud==0.19.0
   

2. Import this library using pip:

   pip install -t lib -r requirements.txt
   

3. Use the following code in my appengine_config.py file:

   import os
   import sys
   import google
   libDir = os.path.join(os.path.dirname(__file__), "lib")
   google.__path__.append(os.path.join(libDir, "google"))
   sys.path.insert(0, libDir)
   

Can anyone shed light on what I might be missing to get this working? I'm just trying to write a Google App Engine app that can write/read from Google Cloud Storage, and I'd like to test locally before deploying.

It looks like the only thing that is required is to include google-cloud into your project requirements.txt file.

Check if this simple sample works for you (you shouldn't get any imports error). Create below files and run pip install -r requirements.txt -t lib. Nothing more is required on my site to make it work.

app.yaml

application: mysample
runtime: python27
api_version: 1
threadsafe: truehandlers:- url: /.*script: main.app

main.py

import webapp2
from google.cloud import storageclass MainPage(webapp2.RequestHandler):def get(self):self.response.headers['Content-Type'] = 'text/plain'self.response.write('Hello, World!')app = webapp2.WSGIApplication([('/', MainPage),
], debug=True)

appengine_config.py

from google.appengine.ext import vendor
import os# Third-party libraries are stored in "lib", vendoring will make
# sure that they are importable by the application.
if os.path.isdir(os.path.join(os.getcwd(), 'lib')):vendor.add('lib')

requirements.txt

google-cloud