https://programmers.co.kr/learn/challenges?tab=all_challenges 코딩테스트 연습 기초부터 차근차근, 직접 코드를 작성해 보세요. programmers.co.kr def solution(new_id): #1 new_id = new_id.lower() new1_id="" #2 for i in new_id: if i.isalpha(): new1_id+=i elif i.isdigit(): new1_id+=i elif i in ['-','_','.']: new1_id+=i #3 for i in range(len(new1_id),1,-1): new1_id=new1_id.replace("."*i,".") #4 if new1_id[0] == ".": if len(new1_..