从文件中抓取IP地址并计算出现的次数

Question

I am quite new to python and got stuck while doing a school assignment. I am supposed to grab IP addresses from a file and then count the amount of times each IP appears and print out the result.

I keep getting an error: Unhashable Type: 'list'

Here is the code:

#!/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')

Thank you!

Answer 1

re.findall() will return a list, so try anther loop with append:

#!/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')

here is file data lines:

123.0.9.1
fjdakl
jfkal 23.2.2.9

the function return None

Answer 2

You're totally there. Just use extend instead of append because the output of findall function must be a list. So appending a list to another list will produce list of list, that's why you got the error Unhashable Type: 'list' .

ips.extend(re.findall(r'\b(?:[\d]{1,3})\.(?:[\d]{1,3})\.(?:[\d]{1,3})\.(?:[\d]{1,3})\b', ip))