PROGRAMMERS 72410: 신규 아이디 추천

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

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Python

def solution(new_id):
    ## 1단계
    new_id = new_id.lower()
    ## 2단계
    new_id_str = ''
    for i in new_id:
        t_data = ord(i)
        if (48 <= t_data <= 57) or (t_data == 45) or (t_data == 95) or (t_data == 46) or (97 <= t_data <= 122):
            new_id_str += i
 
    ## 3단계
    special_word_continu = []
    first = [None, None]
    for i in range(len(new_id_str)):
        if new_id_str[i] == '.' and first[0] is None:
            first[0] = i
        elif new_id_str[i] == '.' and first[0] is not None:
            first[1] = i
        elif new_id_str[i] != '.' and first[0] is not None:
            if first[1] is not None:
                special_word_continu.append(first)
            first = [None, None]
    if first[1] is not None:
        special_word_continu.append(first)
    for i in range(len(special_word_continu) - 1, -1, -1):
        new_id_str = new_id_str[0:special_word_continu[i][0]] + \
                     new_id_str[special_word_continu[i][1]:]
    ## 4단계
    if new_id_str[0] == '.':
        new_id_str = new_id_str[1:]
    try:
        if new_id_str[-1] == '.':
            new_id_str = new_id_str[:-1]
    except IndexError:
        pass
 
    ## 5단계
    if len(new_id_str) == 0:
        new_id_str = 'a'
 
    ## 6단계
    if len(new_id_str) >= 16:
        new_id_str = new_id_str[:15]
    if new_id_str[-1] == '.':
        new_id_str = new_id_str[:-1]
 
    ## 7단계
    while len(new_id_str) < 3:
        new_id_str = new_id_str + new_id_str[-1]
    return new_id_str

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