InvertedIndex.py

import MapReduce
import sys

"""
Word Count Example in the Simple Python MapReduce Framework
"""

mr = MapReduce.MapReduce()

# =============================
# Do not modify above this line

def mapper(record):
    # key: document identifier
    # value: document contents
    key = record[0]
    value = record[1]
    words = value.split()
    for w in words:
      mr.emit_intermediate(w, key)

def reducer(key, list_of_values):
    # key: word
    # value: list of occurrence counts
    #total = 0
    first = True
    sb = ""
    prev = ""
    for v in list_of_values:
       if(prev != v):
          if(first == False):
             sb = sb + "," +v
          else:
             first = False
             sb = v
          prev = v 
    mr.emit((key, sb))

# Do not modify below this line
# =============================
if __name__ == '__main__':
  inputdata = open(sys.argv[1])
  mr.execute(inputdata, mapper, reducer)