#! /usr/bin/python

fp = file('data.txt')           #指定文件
s = fp.read()                   #将指定文件读入内存
fp.close()                      #关闭该文件
a = s.split('\n')
a.insert(LINE, 'a new line')    #在第 LINE+1 行插入
s = '\n'.join(a)                #用'\n'连接各个元素
fp = file('data.txt', 'w')
fp.write(s)
fp.close()

fp = file('data.txt')         
lines = []
for line in fp:                  #内置的迭代器, 效率很高
    lines.append(line)
fp.close()

lines.insert(LINE, 'a new line') #在第 LINE+1 行插入
s = '\n'.join(lines)
fp = file('data.txt', 'w')
fp.write(s)
fp.close()

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