python3 sorted自定義排序

import functools


def my_sort():
    his_file = ['bba1', 'bba1.1', 'bba2', 'bba2.1', 'bba3', 'bba4']

    def cmp(file1, file2):
        if file1[:4] != file2[:4]:      # only return -1, 0, 1
            return 1 if file1[:4] < file2[:4] else -1
        else:
            return 1 if file1[4:] > file2[4:] else -1
    his_file = sorted(his_file, key=functools.cmp_to_key(cmp))
    print(his_file)
    his_file = his_file[5:]

    if len(his_file) < 1:
        return

    print('Delete history logfile %s', ','.join(his_file))
    for file_name in his_file:
        print(file_name)