本文实例讲述了python统计日志ip访问数的方法。分享给大家供大家参考。具体如下：

import re
f=open(\"/tmp/a.log\",\"r\")
arr={} 
lines = f.readlines()
for line in lines: 
  ipaddress=re.compile(r\'^#(((2[0-4]\\d|25[0-5]|[01]?\\d\\d?)\\.){3}(2[0-4]\\d|25[0-5]|[01]?\\d\\d?))\')
  match=ipaddress.match(line)
  if match: 
    ip = match.group(1) 
    if(arr.has_key(ip)): 
      arr[ip]+=1 
    else: 
      arr.setdefault(ip,1) 
f.close() 
for key in arr: 
  print key+\"->\"+str(arr[key])

日志格式为：

#111.172.249.84 - - [12/Dec/2011:05:33:36 +0800] \"GET /images/i/goTop.png HTTP/1.0\" 200 486 \"http://wh.xxxx.com/\" \"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)\" 
#111.172.249.84 - - [12/Dec/2011:05:33:36 +0800] \"GET /images/i/goTop.png HTTP/1.0\" 200 486 \"http://wh.xxxx.com/\" \"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)\" 
#111.172.249.85 - - [12/Dec/2011:05:33:36 +0800] \"GET /images/i/goTop.png HTTP/1.0\" 200 486 \"http://wh.xxxx.com/\" \"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)\" 
#111.172.249.86 - - [12/Dec/2011:05:33:36 +0800] \"GET /images/i/goTop.png HTTP/1.0\" 200 486 \"http://wh.xxxx.com/\" \"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)\" 

输出结果：

111.172.249.86->1
111.172.249.84->2
111.172.249.85->1

注释：python字段的setdefault用法为获取信息，如果获取不到的时候就按照他的参数设置该值

>>> a={} 
>>> a[\'key\']=\'123\' 
>>> print (a) 
{\'key\': \'123\'} 
>>> print (a.setdefault(\'key\',\'456\'))
#显示a这个字典的\'key\'值的内容,因为字典有，所以不会去设置它 
123 
>>> print (a.setdefault(\'key1\',\'456\'))
#显示a这个字典的\'key1\'值的内容，因为字典没有，所以设置为456了 
456 
>>> a 
{\'key1\': \'456\', \'key\': \'123\'} 

希望本文所述对大家的Python程序设计有所帮助。