Python: Calculate Distances

calcdistances.py

#!/usr/bin/env python
import sys

inputfile = sys.argv[1]

with open(inputfile) as fd:
	next(fd)
    	for line in fd:
        	columns=line.split()
        	#print columns
        	columns=map(float,columns[1:5])
        	#print columns
		#print columns[1],columns[0]
       		print "%s \t %s" % (columns[1] - columns[0], columns[3])