lesson 3 reducer

#!/usr/bin/python

import sys
import re
import csv

reader = csv.reader(sys.stdin, delimiter='\t')
writer = csv.writer(sys.stdout, delimiter='\t', quotechar='"', quoting=csv.QUOTE_ALL)

'''
The reducer is to tabulate the counts for each path and return the path with the highest count
'''
path={}

for line in reader:

        #_path, _count = line.strip().split("\t")
        _path, _count = line

        '''
        Tabulate the counts for each path
        '''
        if path.has_key(_path):
                path[_path]=path[_path]+int(_count)
        else:
                path[_path]=int(_count)



'''
Return the path with the highest count
'''
maxValue=max(path.values())
for key in path:
        if path[key]==maxValue:
                writer.writerow([key,str(maxValue)])