diff --git a/fm-rest-api/fm/fm/db/api.py b/fm-rest-api/fm/fm/db/api.py
index dcbbe959..52f49a23 100644
--- a/fm-rest-api/fm/fm/db/api.py
+++ b/fm-rest-api/fm/fm/db/api.py
@@ -9,6 +9,7 @@ Base classes for storage engines
 """
 
 import abc
+import six
 
 from oslo_config import cfg
 from oslo_db import api as db_api
@@ -24,11 +25,10 @@ def get_instance():
     return IMPL
 
 
+@six.add_metaclass(abc.ABCMeta)
 class Connection(object):
     """Base class for storage system connections."""
 
-    __metaclass__ = abc.ABCMeta
-
     @abc.abstractmethod
     def __init__(self):
         """Constructor."""
diff --git a/python-fmclient/fmclient/fmclient/common/wrapping_formatters.py b/python-fmclient/fmclient/fmclient/common/wrapping_formatters.py
index 874bc46c..5f1cfabb 100644
--- a/python-fmclient/fmclient/fmclient/common/wrapping_formatters.py
+++ b/python-fmclient/fmclient/fmclient/common/wrapping_formatters.py
@@ -425,7 +425,7 @@ def wrapper_formatter_factory(ctx, field, formatter):
 
 
 def build_column_stats_for_best_guess_formatting(objs, fields, field_labels, custom_formatters={}):
-    class ColumnStats:
+    class ColumnStats(object):
         def __init__(self, field, field_label, custom_formatter=None):
             self.field = field
             self.field_label = field_label
diff --git a/python-fmclient/fmclient/fmclient/shell.py b/python-fmclient/fmclient/fmclient/shell.py
index c9d3be8f..97aa5e71 100644
--- a/python-fmclient/fmclient/fmclient/shell.py
+++ b/python-fmclient/fmclient/fmclient/shell.py
@@ -8,6 +8,7 @@
 Command-line interface for Fault Management
 """
 
+from __future__ import print_function
 import argparse
 import httplib2
 import logging
@@ -311,14 +312,14 @@ def main():
         FmShell().main(sys.argv[1:])
 
     except KeyboardInterrupt as e:
-        print >> sys.stderr, ('caught: %r, aborting' % (e))
+        print('caught: %r, aborting' % (e), file=sys.stderr)
         sys.exit(0)
 
     except IOError as e:
         sys.exit(0)
 
     except Exception as e:
-        print >> sys.stderr, e
+        print(e, file=sys.stderr)
         sys.exit(1)
 
 
diff --git a/tox.ini b/tox.ini
index 516b0ed3..369605a5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -44,9 +44,6 @@ commands =
 # H102  Apache 2.0 license header not found
 # H104  File contains nothing but comments
 # H105  Don't use author tags
-# H233  Python 3.x incompatible use of print operator
-# H236  Python 3.x incompatible __metaclass__
-# H238  old style class declaration, use new style
 # H301  one import per line
 # H306  imports not in alphabetical order
 # H401  docstring should not start with a space
@@ -59,7 +56,7 @@ commands =
 # E501 skipped because some of the code files include templates
 #      that end up quite wide
 show-source = True
-ignore = H102,H104,H105,H233,H236,H238,H301,H306,H401,H403,H404,H405,H702,H903,E123,E125,E501
+ignore = H102,H104,H105,H301,H306,H401,H403,H404,H405,H702,H903,E123,E125,E501
 exclude = .venv,.git,.tox,dist,doc,*lib/python*,*egg,build,release-tag-*
 # TODO: H106 Don’t put vim configuration in source files (off by default).
 # H203 Use assertIs(Not)None to check for None (off by default).