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]?dd?).){3}(2[0-4]d|25[0-5]|[01]?dd?))')

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。