프로그래머스 | 전화번호 목록

def solution(phone_book):
    dic={}
    for number in phone_book:
        dic[number]=len(number)
        
    dicItems=dic.items()
    dicItemsSort=sorted(dicItems,key=lambda item : item[1])
    
    for i in range(len(dicItemsSort)):
        pick=dicItemsSort[i][0]
        for j in range(i+1,len(dicItemsSort)):
            if dicItemsSort[j][0].find(pick)==0:
                return False
    
    return True