신규 아이디 추천

import re def solution(new_id): # 1 new_id = new_id.lower() # 2 new_id = ''.join(c for c in new_id if c in 'abcdefghijklmnopqrstuvwxyz0123456789-_.') # 3 new_id = re.sub('\.+', '.', new_id) # 4 new_id = re.sub('^\.', '', new_id) new_id = re.sub('\.$', '', new_id) # 5 if new_id == '': new_id = 'a' # 6 if len(new_id) >= 16: new_id = new_id[:15] new_id = re.sub('\.$', '', new_id) # 7 if len(new_id) <= 2: new_id = new_id + new_id[-1] * (3 - len(new_id)) return new_id