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source = open('data.txt', 'r')
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# reads header line


    		
  

  

    
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source.readline()


    		
  

  

    
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number = 0


    		
  

  

    
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# count number of data records


    		
  

  

    
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for line in source:


    		
  

  

    
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    number = number + 1


    		
  

  

    
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source.close()


    		
  

  

    
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print "Total number of data records:", number