신규 아이디 추천

https://programmers.co.kr/learn/courses/30/lessons/72410

코딩테스트 연습 - 신규 아이디 추천

 

문제 풀이

def solution(new_id):
    answer = ''
    
    new_id = new_id.lower()
    
    answer = "".join(word for word in new_id if word.isalnum() or word in '-_.')
    
    while 1:
        answer = answer.replace('..', '.')
        if '..' not in answer:
            break
    
    if len(answer) > 1:
        if answer[0] == ".":
            answer = answer[1:]
            
    if answer[-1] == ".":
        answer = answer[:-1]
    
    if not answer:
        answer += "a"
    
    if len(answer) >= 16:
        answer = answer[:15]
        if answer[-1] == ".":
            answer = answer[:-1]
    
    while 1:
        if len(answer) > 2:
            break;
            
        answer = answer + answer[-1]
            
    return answer