Google Cloud Function - AttributeError: 'module' object has no attribute 'DEFAULT_MAX_REDIRECTS'

Question

I'm using Appengine cron job to schedule cloud function and when I deploy and try to run a job, getting below error. Any idea what could be wrong here? Followed steps from [here][1]

(/base/alloc/tmpfs/dynamic_runtimes/python27/a7637d5531ec9deb_unzipped/python27_lib/versions/1/google/appengine/runtime/wsgi.py:263)
Traceback (most recent call last):
  File "/base/alloc/tmpfs/dynamic_runtimes/python27/a7637d5531ec9deb_unzipped/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/python27/a7637d5531ec9deb_unzipped/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 299, in _LoadHandler
    handler, path, err = LoadObject(self._handler)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27/a7637d5531ec9deb_unzipped/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 85, in LoadObject
    obj = __import__(path[0])
  File "/base/data/home/apps/s~zion-hymns/20180222t221057.407849847593018575/main.py", line 18, in <module>
    import pubsub_utils
  File "/base/data/home/apps/s~zion-hymns/20180222t221057.407849847593018575/pubsub_utils.py", line 24, in <module>
    import oauth2client.contrib.appengine as gae_oauth2client
  File "./lib/oauth2client/contrib/appengine.py", line 36, in <module>
    from oauth2client import client
  File "./lib/oauth2client/client.py", line 39, in <module>
    from oauth2client import transport
  File "./lib/oauth2client/transport.py", line 255, in <module>
    redirections=httplib2.DEFAULT_MAX_REDIRECTS,
AttributeError: 'module' object has no attribute 'DEFAULT_MAX_REDIRECTS'


  [1]: https://firebase.googleblog.com/2017/03/how-to-schedule-cron-jobs-with-cloud.html?utm_campaign=culture_education_functions_en_06-29-17&utm_source=Firebase&utm_medium=yt-desc

Answer 1

Seems that I found the problem. Which version of Python your pip is using? In my case it was 3.6 despite the fact that the Python itself was 2.7

So the problem was that pip downloaded a Python 3.6 syntax version of httplib2, it was uploaded to the Google App Engine, which use Python 2.7. It tried to load in the module and fail miserably.

Try this :

1. Check the vesionn of your pip with :

pip -V

If you see some thing like pip 9.0.1 from /bla/bla/lib/python3.6/site-packages (python 3.6) then continue

2. Install pip for python 2.7 (it should be in the Python2.7 installation pachage under bin folder)

3. Remove old lib folder in your project

4. Run pip install -t lib -r requirements.txt (make sure that this pip is the right 2.7 version)

5. Deploy

By doing that you are using the right version of the lib and it should be working.

Hope it will help.