python 读取文件的前几行

#-*- coding:utf-8 -

'''
Created on 2012-8-20

@author : shaolei
'''
#输入数字N和文件名F ，显示文件F的前N行内容
#提示用户输入要读取文件前几行
N = int(raw_input('Enter a line number : >> '))
Filename = raw_input('Enter a file path: >> ')
file = open(Filename,'r')
lineNum = 0
for line in file.readlines()[0:N]:
    print line

file.close()