Python学习笔记--处理log文件的简单小程序

有如下log文件，请打印出独立IP，并统计独立IP数，
   log文件内容:
   218.79.251.215 - - [23/May/2006:08:57:44 +0800] "GET /fg172.exe HTTP/1.1" 206 2350253
   220.178.150.3 - - [23/May/2006:08:57:40 +0800] "GET /fg172.exe HTTP/1.1" 200 2350253
   59.42.2.185 - - [23/May/2006:08:57:52 +0800] "GET /fg172.exe HTTP/1.1" 200 2350253
   219.140.190.130 - - [23/May/2006:08:57:59 +0800] "GET /fg172.exe HTTP/1.1" 200 2350253
   221.228.143.52 - - [23/May/2006:08:58:08 +0800] "GET /fg172.exe HTTP/1.1" 206 719996
   221.228.143.52 - - [23/May/2006:08:58:08 +0800] "GET /fg172.exe HTTP/1.1" 206 713242

   221.228.143.52 - - [23/May/2006:08:58:09 +0800] "GET /fg172.exe HTTP/1.1" 206 1200250

log文件名为log.txt

#!/usr/bin/python

fd = open("log.txt")

ipDict = {}

for line in fd:
    for i in range( len(line) ):
        if line[i] == ' ':
	    flag = i
	    break

	if ipDict.has_key( line[:flag] ) == False:
	    ipDict[ line[:flag] ] = 1
	else:
	    ipDict[ line[:flag] ] += 1
	
ipNum = 0

print "%-15s%s" % ("IP", "Number")
for key in ipDict.keys():
    print "%-15s%3d" % ( key, ipDict[ key ] )
    ipNum += 1

print "Total client number: %d" % ipNum
fd.close()

运行结果：

IP             Number
220.178.150.3    1
59.42.2.185      1
221.228.143.52   3
219.140.190.130  1
218.79.251.215   1
Total client number: 5