ex16.py

#-*- coding=utf-8 -*-
from sys import argv

script,filename = argv

print "We're going to erase %r."%filename
print "If you don't want that,hit CTRL-C(^C)"
print "If you do want that,hit RETURN."

raw_input("?")

print "Opening the file..."
target = open(filename, mode='w')

print "Truncating the file.Goodbye!"

target.truncate()

print "Now I'm going to ask you for three lines."

line1 = raw_input("line 1:")

line2 = raw_input("line 2:")

line3 = raw_input("line 3:")

print "writing..."

target.write(line1)
target.write('\n')

target.write(line2)
target.write('\n')

target.write(line3)
target.write('\n')

print "close file."

target.close()

运行结果：

运行结果

文本文件内容