使用set（）从列表中删除重复用户

Question

正在尝试使用python中的set从列表中删除重复用户。问题是它没有删除重复的用户：

with open ('live.txt') as file: 
        for line in file.readlines(): 
                word = line.split()
                users = (word[word.index('user')+1]) 
                        l  = users.split() 
                        l = set(l)
                        l = sorted(l)
                        print " ".join(l)

以下是live.txt的内容：

Sep 15 04:34:24 li146-252 sshd[13320]: Failed password for invalid user ronda from 212.58.111.170 port 42201 ssh2
Sep 15 04:34:26 li146-252 sshd[13322]: Failed password for invalid user ronda from 212.58.111.170 port 42330 ssh2
Sep 15 04:34:28 li146-252 sshd[13324]: Failed password for invalid user ronda from 212.58.111.170 port 42454 ssh2
Sep 15 04:34:31 li146-252 sshd[13326]: Failed password for invalid user ronda from 212.58.111.170 port 42579 ssh2
Sep 15 04:34:33 li146-252 sshd[13328]: Failed password for invalid user romero from 212.58.111.170 port 42715 ssh2
Sep 15 04:34:36 li146-252 sshd[13330]: Failed password for invalid user romero from 212.58.111.170 port 42838 ssh2

Answer 1

如果重复的用户行是连续的；可以使用^{}删除重复的：

#!/usr/bin/env python
from itertools import groupby
from operator import itemgetter

def extract_user(line):
    return line.partition('user')[2].partition('from')[0].strip()

with open('live.txt') as file:
    print(" ".join(map(itemgetter(0), groupby(file, key=extract_user))))
    # -> ronda romero

Answer 2

你可以尝试一种更简单的方法

list(set(<Your user list>))

这将返回没有重复的列表。Python具有数据类型set，它是唯一元素的集合。因此，只要将list类型转换为set，就会自动删除重复项

示例：

>>> users = ['john', 'mike', 'ross', 'john','obama','mike']
>>> list(set(users))
['mike', 'john', 'obama', 'ross']
>>>

我希望这能解决你的问题：

import re
def remove_me():
    all_users = []
    with open ('live.txt') as file:
        for line in file.readlines():
            pattern = re.compile('(.*user\s*)([a-zA-Z0-9]*)')
            stmt = pattern.match(line)
            all_users.append(stmt.groups()[1])
    unique_users = list(set(all_users))
    print unique_users

if __name__ == "__main__":
    remove_me()

Answer 3

以下是您需要的代码：

with open ('live.txt') as file: 
    users = []
    for line in file.readlines(): 
        word = line.split()
        users.append(word[word.index('user') + 1])
    unique_users = list(set(users))
print " ".join(unique_users)

输出：

romero ronda