python import os

def listjpgfiles: return

def listdirectorystructure: return os.walk

def checkfileattributes: return os.stat

def changefileattributes: # 获取文件当前属性 attributes = checkfileattributes # Ru果文件是只读的，则移除只读属性 if attributes.st_mode & 0o444: os.chmod return "Read-only attribute removed." else: return "File is not read-only."

jpgfiles = listjpgfiles txtfiles = listtxtfiles directorystructure = listdirectorystructure fileattributes = checkfileattributes changedattributes = changefile_attributes

print print print print print