[user1@localhost ~]$ python
Python 2.6.6 (r266:84292, Jul 10 2013, 22:48:45) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> f1 = open('test.txt')
>>> s1 = f1.read()
>>> s1
'www.csvt.net\ni am a python leaner.\n\n'
>>> f1.close()
>>> 
>>> for i in open('test.txt'):
...     print i
... 
www.csvt.net

i am a python leaner.



>>> f1 = open('test.txt')
>>> f1.readline()
'www.csvt.net\n'
>>> f1.readline()
'i am a python leaner.\n'
>>> f1.readline()
'\n'
>>> f1.readline()
''
>>> f1.close()
>>> f1 = open('test.txt')
>>> f1.readlines()
['www.csvt.net\n', 'i am a python leaner.\n', '\n']
>>> f1 = open('test.txt')
>>> f1.next()
'www.csvt.net\n'
>>> f1.next()
'i am a python leaner.\n'
>>> f1.next()
'\n'
>>> f1.next()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration
>>> l = ['one\n','two\n','three\n']
>>> f1 = open('test.txt','a')
>>> f1.writelines(l)
>>> f1.close
<built-in method close of file object at 0x7f3681965d20>
>>> f1.close()
>>> f1 = open('test.txt','r+')
>>> f1.read()
'www.csvt.net\ni am a python leaner.\n\none\ntwo\nthree\n'
>>> f1.read()
''
>>> f1.seek(0,0)
>>> f1.read()
'www.csvt.net\ni am a python leaner.\n\none\ntwo\nthree\n'
>>> f1.seek(0,0)
>>> f1.seek(0,2)
>>> f1.read()
''
>>> f1.writelines(l)
>>> f1.flush()
>>> f1.close()
>>> 

[user1@localhost ~]$ ls
Desktop    Downloads  new.txt   Pictures  Templates  test.txt~
Documents  Music      new.txt~  Public    test.txt   Videos
[user1@localhost ~]$ cat test.txt
www.csvt.net
i am a python leaner.

[user1@localhost ~]$ ls
Desktop    Downloads  new.txt   Pictures  Templates  test.txt~
Documents  Music      new.txt~  Public    test.txt   Videos
[user1@localhost ~]$ cat test.txt
www.csvt.net
i am a python leaner.

one
two
three
[user1@localhost ~]$ cat test.txt
www.csvt.net
i am a python leaner.

one
two
three
[user1@localhost ~]$ cat test.txt
www.csvt.net
i am a python leaner.

one
two
three
one
two
three
[user1@localhost ~]$