读取文件第一行内容：
|
1
2
3
4
|
for
c in
open(‘7.py‘,‘r‘).readline():
print
c,
else:
print
‘readline is over!‘
|
打印结果为：
|
1
2
3
|
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：
|
1
2
3
|
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：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
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#
|