== Start a new project ==

This [https://cloud.google.com/appengine/docs/python/tools/using-local-server link] is a completed setup guide by Google. In this project, one more step is to import Map and Reduce Library in java files.

Map: com.google.appengine.tools.mapreduce.Mapper;

Reduce: com.google.appengine.tools.mapreduce.Reducer; com.google.appengine.tools.mapreduce.ReducerInput;

== Map and Reduce Function ==