python解压TAR文件至至指定文件夹

#########  Extract all files from src_dir to des_dir
def extract_tar_files(src_dir,des_dir):
files = os.listdir(src_dir)
for file in files:
dir_tmp = os.path.join(src_dir, file)
print dir_tmp
if not os.path.isdir(dir_tmp): ##是文件，非文件夹
#解压特定文件
if dir_tmp.endswith("gz") and (dir_tmp.find(cs.Port_week_perfer_name_start) != -1):
#f = zipfile.ZipFile(dir_tmp, mode="r")
f = tarfile.open(dir_tmp)
names = f.getnames()
for name in names:
f.extract(name, path=des_dir)
else:
extract_tar_files(dir_tmp,des_dir)
return 0