[프로그래머스] 파일명 정렬

문제

def solution(files):
    answer = []
    for f in files:
        head, number, tail = '', '', ''

        number_check = False
        for i in range(len(f)):
            if f[i].isdigit():
                number += f[i]
                number_check = True
            elif not number_check:
                head += f[i]
            else:
                tail = f[i:]
                break
        answer.append((head, number, tail))

    answer.sort(key=lambda x: (x[0].upper(), int(x[1])))
    return [''.join(i) for i in answer]

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