python使用基本文件方法

# read(n) 指定参数
>>> f = open(r'I:\python\test.txt')
>>> f.read(7)
'Welcome'
>>> f.read(4)
' to '
>>> f.close()

# read() 不指定参数
>>> f = open(r'I:\python\test.txt')
>>> print f.read()
Welcome to this file
There is nothing here except
This stupid haiku
>>> f.close()

# readline() 
>>> f = open(r'I:\python\test.txt')
>>> for i in range(3):
    print str(i) + ':' + f.readline()

    
0:Welcome to this file

1:There is nothing here except

2:This stupid haiku
>>> f.close()

#readlines()
>>> import pprint
>>> pprint.pprint(open(r'I:\python\test.txt').readlines())
['Welcome to this file\n',
 'There is nothing here except\n',
 'This stupid haiku']