python - 从文件中获取IP地址并计数发生次数

我对python很陌生，在做学校作业时遇到了麻烦。我应该从一个文件中获取IP地址，然后计算每个IP出现的次数，并打印出结果。
我一直收到一个错误：unhable type:'list'
代码如下：

#!/usr/bin/python
import re

def grab_ip(file):
    ips = []
    occurence = {}
    with open (file) as file:
        for ip in file:
            ips.append(re.findall(r'(?:[\d]{1,3})\.(?:[\d]{1,3})\.(?:[\d]{1,3})\.(?:[\d]{1,3})', ip))
        for ipaddr in ips:
            if ipaddr in occurence:
                occurence[ipaddr] = occurence[ipaddr] + 1
            else:
                occurence[ipaddr] = 1
    for key, value in occurence.iteritems():
        print key, value
    return None
print grab_ip('FILE_WITH_IPS.txt')

谢谢您！

最佳答案

re.findall()将返回一个列表，因此使用append尝试另一个循环：

#!/usr/bin/python
import re

def grab_ip(file):
    ips = []
    occurence = {}
    with open (file) as file:
        for ip in file:
            ip_data=re.findall(r'(?:[\d]{1,3})\.(?:[\d]{1,3})\.(?:[\d]{1,3})\.(?:[\d]{1,3})',ip)
            for i in ip_data:
                ips.append(i)
        for ipaddr in ips:
            if ipaddr in occurence:
                occurence[ipaddr] = occurence[ipaddr] + 1
            else:
                occurence[ipaddr] = 1
    for key, value in occurence.iteritems():
        print key, value
    return None
print grab_ip('data')

以下是文件数据行：

123.0.9.1
fjdakl
jfkal 23.2.2.9

函数不返回