diff --git a/paddlehub/commands/base_command.py b/paddlehub/commands/base_command.py
index 8563d8c138b7c7d759db31122e32a633127ee22e..1d08525912789114d3e09464a749a6b34dd282b4 100644
--- a/paddlehub/commands/base_command.py
+++ b/paddlehub/commands/base_command.py
@@ -23,7 +23,7 @@ from paddlehub.common.arg_helper import add_argument, print_arguments
 ENTRY = "hub"
 
 
-class BaseCommand:
+class BaseCommand(object):
     command_dict = {}
 
     @classmethod
diff --git a/paddlehub/commands/cml_utils.py b/paddlehub/commands/cml_utils.py
index 5b2fb908ab4f12188698ce1ab18fc58c57a8ca15..74dcc382ecfe84c30c1fd64c8cd6684b6616e22b 100644
--- a/paddlehub/commands/cml_utils.py
+++ b/paddlehub/commands/cml_utils.py
@@ -61,7 +61,7 @@ def get_ph_value():
     return 11
 
 
-class TablePrinter:
+class TablePrinter(object):
     def __init__(self,
                  titles,
                  placeholders,
diff --git a/paddlehub/common/downloader.py b/paddlehub/common/downloader.py
index 3194944ffc295e91a95538e4fd9d5b6dafa46c6e..b82cb61937bf69e813f396995e01358e28948e4e 100644
--- a/paddlehub/common/downloader.py
+++ b/paddlehub/common/downloader.py
@@ -45,7 +45,7 @@ def progress(str, end=False):
         sys.stdout.flush()
 
 
-class Downloader:
+class Downloader(object):
     def download_file(self,
                       url,
                       save_path,
diff --git a/paddlehub/common/hub_server.py b/paddlehub/common/hub_server.py
index 6f48c978c8ccb14b79f8700f5b1ef7c1f4452a0a..b52cf55e0c2c97009f3bf3949fe2fcd733fdb64d 100644
--- a/paddlehub/common/hub_server.py
+++ b/paddlehub/common/hub_server.py
@@ -29,7 +29,7 @@ RESOURCE_LIST_FILE = "resource_list_file.yml"
 CACHE_TIME = 60 * 10
 
 
-class HubServer:
+class HubServer(object):
     def __init__(self, server_url=None):
         if not server_url:
             server_url = "https://paddlehub.bj.bcebos.com/"
diff --git a/paddlehub/dataset/base_cv_dataset.py b/paddlehub/dataset/base_cv_dataset.py
index 07b050c700490f8c5bc2a226d5091a804df3d561..053dda3b85467da0db34e5f3440872bdd36c8ca6 100644
--- a/paddlehub/dataset/base_cv_dataset.py
+++ b/paddlehub/dataset/base_cv_dataset.py
@@ -22,7 +22,7 @@ import paddlehub as hub
 from paddlehub.common.downloader import default_downloader
 
 
-class ImageClassificationDataset:
+class ImageClassificationDataset(object):
     def __init__(self):
         self.base_path = None
         self.train_list_file = None
diff --git a/paddlehub/io/parser.py b/paddlehub/io/parser.py
index 8cebcec77657a2e91137038408476949a53d5def..d332d7f1fa30a5aa91553f8f4175d4d612da3574 100644
--- a/paddlehub/io/parser.py
+++ b/paddlehub/io/parser.py
@@ -19,7 +19,7 @@ from __future__ import print_function
 import yaml
 
 
-class CSVFileParser:
+class CSVFileParser(object):
     def __init__(self):
         pass
 
@@ -46,7 +46,7 @@ class CSVFileParser:
         return self.content
 
 
-class YAMLFileParser:
+class YAMLFileParser(object):
     def __init__(self):
         pass
 
@@ -59,7 +59,7 @@ class YAMLFileParser:
         return yaml.load(content, Loader=yaml.BaseLoader)
 
 
-class TextFileParser:
+class TextFileParser(object):
     def __init__(self):
         pass
 
diff --git a/paddlehub/module/base_processor.py b/paddlehub/module/base_processor.py
index 90e21c3be106543c2e008f8bce767935151c37bb..72da4a8ca621cabd6f14d512773fd880b914608e 100644
--- a/paddlehub/module/base_processor.py
+++ b/paddlehub/module/base_processor.py
@@ -17,7 +17,7 @@ from __future__ import division
 from __future__ import print_function
 
 
-class BaseProcessor:
+class BaseProcessor(object):
     def __init__(self, module):
         pass
 
diff --git a/paddlehub/module/checker.py b/paddlehub/module/checker.py
index 3e4ca6a1c90e1bfeba6a9197753b1fba6973c6ff..bab8ff6fb30fc386f8527c618ddbf3c68cbb715f 100644
--- a/paddlehub/module/checker.py
+++ b/paddlehub/module/checker.py
@@ -29,7 +29,7 @@ CHECK_INFO_PB_FILENAME = "check_info.pb"
 FILE_SEP = "/"
 
 
-class ModuleChecker:
+class ModuleChecker(object):
     def __init__(self, module_path):
         self.module_path = module_path
 
diff --git a/paddlehub/module/manager.py b/paddlehub/module/manager.py
index c013c2ade876a6408d18525cc73efec943885632..06db32a11989a4134361259b2539fb371a020740 100644
--- a/paddlehub/module/manager.py
+++ b/paddlehub/module/manager.py
@@ -25,7 +25,7 @@ from paddlehub.common.dir import MODULE_HOME
 import paddlehub as hub
 
 
-class LocalModuleManager:
+class LocalModuleManager(object):
     def __init__(self, module_home=None):
         self.local_modules_dir = module_home if module_home else MODULE_HOME
         self.modules_dict = {}
diff --git a/paddlehub/module/signature.py b/paddlehub/module/signature.py
index cc45229951a705552555449d25d29ca64a604fc5..93150c0a679806cf6b633581243b4431bffcb275 100644
--- a/paddlehub/module/signature.py
+++ b/paddlehub/module/signature.py
@@ -21,7 +21,7 @@ from paddle.fluid.framework import Variable
 from paddlehub.common.utils import to_list
 
 
-class Signature:
+class Signature(object):
     def __init__(self,
                  name,
                  inputs,
diff --git a/paddlehub/reader/cv_reader.py b/paddlehub/reader/cv_reader.py
index 0b8e37dbdcc1aec88e164a372fb23a8b99e009d5..aeeec007a38b49afd575353bdf4912d4aaec0d31 100644
--- a/paddlehub/reader/cv_reader.py
+++ b/paddlehub/reader/cv_reader.py
@@ -32,7 +32,7 @@ color_mode_dict = {
 }
 
 
-class ImageClassificationReader:
+class ImageClassificationReader(object):
     def __init__(self,
                  image_width,
                  image_height,