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If you want to use 3rd party libraries that are not included in this list, then you’ll have to add them manually since you have done that by adding lib folder and including all the package folder follow these steps.
Create your_app_directory/appengine_config.py file.
Add these following lines inside that file
from google.appengine.ext import vendor
vendor.add('lib')
This should solve the import error problem.
Source:stackexchange.com