핸드폰 번호 가리기
def solution(num): return num.replace(num[:-4],'*'*len(num[:-4]))
def hide_numbers(s): return "*"*(len(s)-4) + s[-4:]
# 정규표현식 import re def hide_numbers(s): p = re.compile(r'\d(?=\d{4})') return p.sub("*", s, count = 0)