代码如下：
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# -*-coding:utf-8- -*-
# 读写文件
# close - 关闭文件（保存）。
# read - 读取文件内容，结果可赋值给一个变量。
# readline - 读取文本文件中的一行。
# truncate - 清空文件。
# write(stuff) - 将 stuff 写入文件
# 编写一个文本编辑器
from sys import argv
script, filename = argv
print "We're going to earse %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, "w+") # "w" 写入模式； "r" 读取模式； "a" 追加模式
print "Truncating the file. Goodbye!"
target.truncate() # 从当前位置截断。 括号里也可以加参数，表示从第几位开始截断。
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 "I'm going to write these to the file."
target.write(line1)
target.write("\n")
target.write(line2)
target.write("\n")
target.write(line3)
target.write("\n")
print "And finally, we close it."
target.close()
执行结果：
