support python3.8

Author: huiguangjun

oss2/utils.py

@@ -416,7 +416,7 @@ def read(self, amt=None):
         if not content:
             self.read_all = True
             _invoke_progress_callback(self.progress_callback, self.offset, None)
-            return ''
+            return to_bytes('')
         else:
             _invoke_progress_callback(self.progress_callback, self.offset, None)
 
@@ -488,7 +488,7 @@ def next(self):
 
     def read(self, amt=None):
         if self.offset >= self.size:
-            return ''
+            return to_bytes('')
 
         if amt is None or amt < 0:
             bytes_to_read = self.size - self.offset

setup.py

@@ -49,6 +49,7 @@
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7'
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8'
     ]
 )

tests/test_headers.py

@@ -9,15 +9,15 @@ def test_check_requestHeader(self):
         myHeader = RequestHeader()
 
         myHeader.set_server_side_encryption(algorithm="AES256")
-        self.assertTrue(myHeader["x-oss-server-side-encryption"] is "AES256")
+        self.assertEqual(myHeader["x-oss-server-side-encryption"], "AES256")
 
         myHeader.set_server_side_encryption(algorithm='KMS')
-        self.assertTrue(myHeader["x-oss-server-side-encryption"] is "KMS")
+        self.assertEqual(myHeader["x-oss-server-side-encryption"], "KMS")
         self.assertTrue("x-oss-server-side-encryption-key-id" not in myHeader)
 
         myHeader.set_server_side_encryption(algorithm="KMS", cmk_id="1111")
-        self.assertTrue(myHeader["x-oss-server-side-encryption"] is "KMS")
-        self.assertTrue(myHeader["x-oss-server-side-encryption-key-id"] is "1111")
+        self.assertEqual(myHeader["x-oss-server-side-encryption"], "KMS")
+        self.assertEqual(myHeader["x-oss-server-side-encryption-key-id"], "1111")
 
         myHeader.set_server_side_encryption(algorithm="aaa")
         self.assertTrue("x-oss-server-side-encryption" not in myHeader)

tests/test_object.py

@@ -309,7 +309,7 @@ def test_get_object_iterator(self):
         content_got = b''
 
         for chunk in result:
-            content_got += oss2.to_bytes(chunk)
+            content_got += chunk
 
         self.assertEqual(len(content), len(content_got))
         self.assertEqual(content, content_got)