strange problem

[ken]

This file has 1,000,000+ lines in it, yet when I print the counter 'cin' 
at EOF I get around 10,000 less lines. Any ideas?

    lineIn = 
csv.reader(file("rits_feed\\rits_feed_US.csv",'rb'),delimiter='|')
     for emp in lineIn:
         cin=cin+1
     print cin