Google SDK

[esseti]

I'm following this tutorial https://developers.google.com/tasks/quickstart/python forcing the code to python 2.
i've installed the libraries with
python2.7 -m pip install --upgrade --target=lib/ google-api-python-client google-auth-httplib2 google-auth-oauthlib

and set wf to use libraries

if __name__ == u"__main__":
    wf = Workflow(libraries=['./lib'])
    sys.exit(wf.run(main))

Thus, the import in my code works, but with the libraries they fail

15:31:22 workflow.py:2080 ERROR    No module named google.api_core.client_options
Traceback (most recent call last):
  File "/Users/user/Documents/alfred/Alfred.alfredpreferences/workflows/user.workflow.A12936D2-8F14-4620-9349-2CDBD6E831BF/workflow/workflow.py", line 2073, in run
    func(self)
  File "google_tasks.py", line 17, in main
    from googleapiclient.discovery import build
  File "./lib/googleapiclient/discovery.py", line 50, in <module>
    import google.api_core.client_options
ImportError: No module named google.api_core.client_options

any idea how to use these librarries? or where the problem is?