diff --git a/sdks/python/apache_beam/internal/__init__.py b/sdks/python/apache_beam/internal/__init__.py
index 0bce5d68f724..84381ed71d4f 100644
--- a/sdks/python/apache_beam/internal/__init__.py
+++ b/sdks/python/apache_beam/internal/__init__.py
@@ -16,3 +16,5 @@
 #
 
 """For internal use only; no backwards-compatibility guarantees."""
+
+from __future__ import absolute_import
diff --git a/sdks/python/apache_beam/internal/gcp/__init__.py b/sdks/python/apache_beam/internal/gcp/__init__.py
index 0bce5d68f724..84381ed71d4f 100644
--- a/sdks/python/apache_beam/internal/gcp/__init__.py
+++ b/sdks/python/apache_beam/internal/gcp/__init__.py
@@ -16,3 +16,5 @@
 #
 
 """For internal use only; no backwards-compatibility guarantees."""
+
+from __future__ import absolute_import
diff --git a/sdks/python/apache_beam/internal/gcp/auth.py b/sdks/python/apache_beam/internal/gcp/auth.py
index 97a0ef83e85d..cff88879d1ae 100644
--- a/sdks/python/apache_beam/internal/gcp/auth.py
+++ b/sdks/python/apache_beam/internal/gcp/auth.py
@@ -17,17 +17,19 @@
 
 """Dataflow credentials and authentication."""
 
+from __future__ import absolute_import
+
 import datetime
 import json
 import logging
 import os
 
+from future.moves.urllib.request import Request
+from future.moves.urllib.request import urlopen
 from oauth2client.client import GoogleCredentials
 from oauth2client.client import OAuth2Credentials
 
 from apache_beam.utils import retry
-from six.moves.urllib.request import Request
-from six.moves.urllib.request import urlopen
 
 # When we are running in GCE, we can authenticate with VM credentials.
 is_running_in_gce = False
diff --git a/sdks/python/apache_beam/internal/gcp/json_value.py b/sdks/python/apache_beam/internal/gcp/json_value.py
index c4f3d7ba4da6..a4c6fb9d135a 100644
--- a/sdks/python/apache_beam/internal/gcp/json_value.py
+++ b/sdks/python/apache_beam/internal/gcp/json_value.py
@@ -17,6 +17,10 @@
 
 """JSON conversion utility functions."""
 
+from __future__ import absolute_import
+
+from apache_beam.options.value_provider import ValueProvider
+
 # Protect against environments where apitools library is not available.
 # pylint: disable=wrong-import-order, wrong-import-position
 try:
@@ -25,9 +29,12 @@
   extra_types = None
 # pylint: enable=wrong-import-order, wrong-import-position
 
-import six
-
-from apache_beam.options.value_provider import ValueProvider
+try:              # Python 2
+  unicode         # pylint: disable=unicode-builtin
+  long            # pylint: disable=long-builtin
+except NameError: # Python 3
+  unicode = str
+  long = int
 
 _MAXINT64 = (1 << 63) - 1
 _MININT64 = - (1 << 63)
@@ -49,7 +56,7 @@ def get_typed_value_descriptor(obj):
     ~exceptions.TypeError: if the Python object has a type that is not
       supported.
   """
-  if isinstance(obj, six.string_types):
+  if isinstance(obj, (str, unicode)):
     type_name = 'Text'
   elif isinstance(obj, bool):
     type_name = 'Boolean'
@@ -101,11 +108,11 @@ def to_json_value(obj, with_type=False):
     return extra_types.JsonValue(object_value=json_object)
   elif with_type:
     return to_json_value(get_typed_value_descriptor(obj), with_type=False)
-  elif isinstance(obj, six.string_types):
+  elif isinstance(obj, (str, unicode)):
     return extra_types.JsonValue(string_value=obj)
   elif isinstance(obj, bool):
     return extra_types.JsonValue(boolean_value=obj)
-  elif isinstance(obj, six.integer_types):
+  elif isinstance(obj, (int, long)):
     if _MININT64 <= obj <= _MAXINT64:
       return extra_types.JsonValue(integer_value=obj)
     else:
diff --git a/sdks/python/apache_beam/internal/gcp/json_value_test.py b/sdks/python/apache_beam/internal/gcp/json_value_test.py
index c22d067beea0..e7cf7f15e361 100644
--- a/sdks/python/apache_beam/internal/gcp/json_value_test.py
+++ b/sdks/python/apache_beam/internal/gcp/json_value_test.py
@@ -17,6 +17,8 @@
 
 """Unit tests for the json_value module."""
 
+from __future__ import absolute_import
+
 import unittest
 
 from apache_beam.internal.gcp.json_value import from_json_value
diff --git a/sdks/python/apache_beam/internal/module_test.py b/sdks/python/apache_beam/internal/module_test.py
index be34ac27e25b..baed9652b695 100644
--- a/sdks/python/apache_beam/internal/module_test.py
+++ b/sdks/python/apache_beam/internal/module_test.py
@@ -17,7 +17,10 @@
 
 """Module used to define functions and classes used by the coder unit tests."""
 
+from __future__ import absolute_import
+
 import re
+from builtins import object
 
 
 class TopClass(object):
diff --git a/sdks/python/apache_beam/internal/pickler.py b/sdks/python/apache_beam/internal/pickler.py
index 3e4fe05974be..3a04d8c36bf3 100644
--- a/sdks/python/apache_beam/internal/pickler.py
+++ b/sdks/python/apache_beam/internal/pickler.py
@@ -28,6 +28,8 @@
 the coders.*PickleCoder classes should be used instead.
 """
 
+from __future__ import absolute_import
+
 import base64
 import logging
 import sys
diff --git a/sdks/python/apache_beam/internal/pickler_test.py b/sdks/python/apache_beam/internal/pickler_test.py
index e75dac384628..79208aa10706 100644
--- a/sdks/python/apache_beam/internal/pickler_test.py
+++ b/sdks/python/apache_beam/internal/pickler_test.py
@@ -17,6 +17,8 @@
 
 """Unit tests for the pickler module."""
 
+from __future__ import absolute_import
+
 import unittest
 
 from apache_beam.internal import module_test
diff --git a/sdks/python/apache_beam/internal/util.py b/sdks/python/apache_beam/internal/util.py
index e74dd4333ac6..afa4b0563b8d 100644
--- a/sdks/python/apache_beam/internal/util.py
+++ b/sdks/python/apache_beam/internal/util.py
@@ -20,9 +20,12 @@
 For internal use only. No backwards compatibility guarantees.
 """
 
+from __future__ import absolute_import
+
 import logging
 import threading
 import weakref
+from builtins import object
 from multiprocessing.pool import ThreadPool
 
 
@@ -51,6 +54,9 @@ def __eq__(self, other):
     """
     return isinstance(other, ArgumentPlaceholder)
 
+  def __hash__(self):
+    return hash(type(self))
+
 
 def remove_objects_from_args(args, kwargs, pvalue_classes):
   """For internal use only; no backwards-compatibility guarantees.
diff --git a/sdks/python/apache_beam/internal/util_test.py b/sdks/python/apache_beam/internal/util_test.py
index 9a2e3977a708..aeba8dcdf444 100644
--- a/sdks/python/apache_beam/internal/util_test.py
+++ b/sdks/python/apache_beam/internal/util_test.py
@@ -16,6 +16,7 @@
 #
 
 """Unit tests for the util module."""
+from __future__ import absolute_import
 
 import unittest
 
diff --git a/sdks/python/tox.ini b/sdks/python/tox.ini
index 61dc12c3017a..481c5f984a06 100644
--- a/sdks/python/tox.ini
+++ b/sdks/python/tox.ini
@@ -99,6 +99,7 @@ deps =
   flake8==3.5.0
 modules =
   apache_beam/coders
+  apache_beam/internal
   apache_beam/metrics
 commands =
   python --version