a script which joins two .xls files,then make statistic

xls.py

import xlrd

nameBook = xlrd.open_workbook("/home/chm/Documents/namesheet.xls")
markBook = xlrd.open_workbook("/home/chm/Documents/mark.xls")

nameSheet = nameBook.sheet_by_index(0)
markSheet = markBook.sheet_by_index(0)

fullmark   = 0
aboveninety	= 0
aboveeighty = 0
abovesixty	= 0
belowsixty	= 0

for rx in range(markSheet.nrows):
	for ry in range(nameSheet.nrows):
		studentId=(int)(markSheet.cell_value(rx,2)) 
		if (studentId/1000000000 == 1023) and studentId%100 == nameSheet.cell_value(ry,0):
			mark = markSheet.cell_value(rx,3)
			print nameSheet.cell_value(ry,1),mark
			
			if mark == 100:
				fullmark 	+=1
			elif mark >=90:
				aboveninety +=1
			elif mark >=80:
				aboveeighty +=1
			elif mark >=60:
				abovesixty	+= 1
			else:
				belowsixty 	+= 1

print "fullmarks:\t",fullmark
print "90~100:\t\t",aboveninety
print "80~90:\t\t",aboveeighty
print "60~80:\t\t",abovesixty
print "0~60:\t\t",belowsixty