How to install Tweepy on Google App Engine that runs Python 2.7

In src direcory:

1. make another directory named lib
   
   
2. run the following command:
   pip2.7 install -t lib/ tweepy==3.10.0
   
   (Tweepy 3.10.0 is the last version to support Python 2.7 and Python 3.5.)
   
   
3. create a file named appengine_config.py with the following content:
   from google.appengine.ext import vendor
   vendor.add("lib")
   
   
4. in app.yaml add the following:
   libraries:
   - name: ssl
     version: latest
   

And that should be it!