读取文件第一行内容：

for c in open('7.py','r').readline():
	print c,
else:
	print 'readline is over!'

 打印结果为：

root@IdeaPad:~/test# python 8.py 
s 1   =   ' w w w . e v i l x r . c o m ' 
readline is over!

用Python实现文件内容的拷贝：

root@IdeaPad:~/test# cat 9.py 
for ss in open('7.py','r').readlines():
	open('evilxr.txt','a+').write(ss)

 运行该python后会在该目录下生成一个名为evilxr.txt的文件，该文件的内容和7.py的一样：

root@IdeaPad:~/test# ls
1.txt  4.py  7.py   9.py        ac.tar      aobama      newfile
2.txt  5.py  8.py   aa.tar.gz   ac.tar.bz2  evilxr
3.py   6.py  8.py~  ab.tar.bz2  ac.tar.gz   evilxr.txt
root@IdeaPad:~/test# cat evilxr.txt 
s1 = 'www.evilxr.com'
ev = [1,3,4,5,6,7,86,120]

i = 0
for c in s1:
	print format (i,'2d'), c
	i = i + 1
else:
	print 'The for is out!'


i = 0
for evilxr in ev:
	print format(i,'2d'),evilxr
	i = i + 1

print 'This is New!'

tup = (1,2,3,4,5)
for t in tup:
	print t
else:
	print 'This is tup!'
root@IdeaPad:~/test#