# 判斷讀權限os.access(<my file>, os.R_OK)# 判斷寫權限os.access(<my file>, os.W_OK)# 判斷執行權限os.access(<my file>, os.X_OK)# 判斷讀、寫、執行權限os.access(<my file>, os.R_OK | os.W_OK | os.X_OK)

import osimport pwdimport stat def is_readable(cls, path, user):  user_info = pwd.getpwnam(user)  uid = user_info.pw_uid  gid = user_info.pw_gid  s = os.stat(path)  mode = s[stat.ST_MODE]  return (    ((s[stat.ST_UID] == uid) and (mode & stat.S_IRUSR > 0)) or    ((s[stat.ST_GID] == gid) and (mode & stat.S_IRGRP > 0)) or    (mode & stat.S_IROTH > 0)    )def is_writable(cls, path, user):  user_info = pwd.getpwnam(user)  uid = user_info.pw_uid  gid = user_info.pw_gid  s = os.stat(path)  mode = s[stat.ST_MODE]  return (    ((s[stat.ST_UID] == uid) and (mode & stat.S_IWUSR > 0)) or    ((s[stat.ST_GID] == gid) and (mode & stat.S_IWGRP > 0)) or    (mode & stat.S_IWOTH > 0)    )def is_executable(cls, path, user):  user_info = pwd.getpwnam(user)  uid = user_info.pw_uid  gid = user_info.pw_gid  s = os.stat(path)  mode = s[stat.ST_MODE]  return (    ((s[stat.ST_UID] == uid) and (mode & stat.S_IXUSR > 0)) or    ((s[stat.ST_GID] == gid) and (mode & stat.S_IXGRP > 0)) or    (mode & stat.S_IXOTH > 0)    )