PYTHON文件读取操作

周六上午在家闲着，老婆在睡觉，小孩陪大姨出去玩了。

我就 进电脑房，拿起《PYTHON基础教程》，按书写起样例代码。

看到二百多页，讲到文件操作了。

文件操作在IT工作中很有用的。因为很多工作都是从配置文件里读取每一行参数，然后，对每一个进行同样的设置操作。

 1 #file_operation.py
 2
 3 import fileinput,sys
 4
 5 filename = r'C:\python33\sample.txt'
 6
 7 def process(string):
 8     print ('process:', string)
 9
10 #operation very char string
11 f = open(filename)
12 while True:
13     char = f.read(1)
14     if not char: break
15     process(char)
16 f.close()
17
18 #operation very line
19 f = open(filename)
20 while True:
21     line = f.readline()
22     if not line: break
23     process(line)
24 f.close()
25
26 #operation with for operate
27 f = open(filename)
28 for char in f.read():
29     process(char)
30 f.close()
31
32 f = open(filename)
33 for line in f.readlines():
34     process(line)
35 f.close()
36
37 #operation fileimput model
38 for line in fileinput.input(filename):
39     process(line)
40 f.close()
41
42 #operation fileimput model
43 f = open(filename)
44 for line in f:
45     process(line)
46 f.close()
47 #more less
48 for line in open(filename):
49     process(line)
50
51 #demo sys.stdin
52 for line in sys.stdin:
53     process(line)