text: import sys
  import string
  
  def mapper():
      '''
      In this exercise, we want to sum up all the values in the ENTRIEsn_hourly column in the 
      turnstile_weather.csv. You can check out the csv file and its structure below:
      https://www.dropbox.com/s/meyki2wl9xfa7yk/turnstile_data_master_with_weather.csv
      
      Each line of input will look like a row from our final Subway-MTA dataset, in csv format.
      
      This mapper should
      1) return 0 as the key and
      2) the number in the ENTRIEsn_hourly column as the value
      3)  The key and the count should be separated by a tab
          for example: 0\t12345
  
      Example output to the reducer would look like this:
      0   10501050105010.0
      '''
      for line in sys.stdin:
      	# your code here
  
  mapper()
  