排序遍历带前缀的文件名

排序遍历带前缀的文件名

def getTimeId(file):
    fileAttrs = file.split("_")
    fileTime = fileAttrs[0]
    return fileTime

def CleanUpExpireTar(backupDir, postfix):
    fileReservedListlist = []
    fileList = listDirWithPostfix(backupDir, postfix)
    if len(fileList) > 3:
        fileReservedListlist = list(reversed(sorted(fileList, key=lambda x:getTimeId(x))))[:3]
    removefileList = list(set(fileList).difference(set(fileReservedListlist)))
    for file in removefileList:
        os.remove(os.path.join(backupDir, file))