[프로그래머스] / [Level 2] / [Python 오픈채팅방

https://school.programmers.co.kr/learn/courses/30/lessons/42888

프로그래머스

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from collections import defaultdict

def solution(record):
    answer = []
    new = []
    id_nic = defaultdict(str)

    for rec in record:
        j = rec.split(' ')
        if j[0] == 'Enter':
            id_nic[j[1]] = j[2]
            answer.append(f'{j[1]} 님이 들어왔습니다.')
        elif j[0] == 'Leave':
            answer.append(f'{j[1]} 님이 나갔습니다.')
        elif j[0] == 'Change':
            id_nic[j[1]] = j[2]

    for i in answer:
        i = i.replace(i.split('님')[0], id_nic[i.split(' 님')[0]])
        new.append(i)

    return new