Remove six.PY3

The Python 2.7 Support has been dropped since Ussuri.
So remove hacking rules for compatibility between python 2 and 3.

Change-Id: Ibed92787d66227fec0cf48c78de8a24f9b39cc52

oslo_i18n/_factory.py

@@ -19,8 +19,6 @@
 import gettext
 import os
 
-import six
-
 from oslo_i18n import _lazy
 from oslo_i18n import _locale
 from oslo_i18n import _message
@@ -75,7 +73,7 @@ class TranslatorFactory(object):
                                 fallback=True)
         # Use the appropriate method of the translation object based
         # on the python version.
-        m = t.gettext if six.PY3 else t.ugettext
+        m = t.gettext
 
         def f(msg):
             """oslo_i18n.gettextutils translation function."""
@@ -103,7 +101,7 @@ class TranslatorFactory(object):
                                 fallback=True)
         # Use the appropriate method of the translation object based
         # on the python version.
-        m = t.gettext if six.PY3 else t.ugettext
+        m = t.gettext
 
         def f(ctx, msg):
             """oslo.i18n.gettextutils translation with context function."""
@@ -140,7 +138,7 @@ class TranslatorFactory(object):
                                 fallback=True)
         # Use the appropriate method of the translation object based
         # on the python version.
-        m = t.ngettext if six.PY3 else t.ungettext
+        m = t.ngettext
 
         def f(msgsingle, msgplural, msgcount):
             """oslo.i18n.gettextutils plural translation function."""

oslo_i18n/_message.py

@@ -117,7 +117,7 @@ class Message(six.text_type):
 
         if not has_contextual_form and not has_plural_form:
             # This is the most common case, so check it first.
-            translator = lang.gettext if six.PY3 else lang.ugettext
+            translator = lang.gettext
             translated_message = translator(msgid)
 
         elif has_contextual_form and has_plural_form:
@@ -127,7 +127,7 @@ class Message(six.text_type):
 
         elif has_contextual_form:
             (msgctx, msgtxt) = msgid
-            translator = lang.gettext if six.PY3 else lang.ugettext
+            translator = lang.gettext
 
             msg_with_ctx = "%s%s%s" % (msgctx, CONTEXT_SEPARATOR, msgtxt)
             translated_message = translator(msg_with_ctx)
@@ -138,7 +138,7 @@ class Message(six.text_type):
 
         elif has_plural_form:
             (msgsingle, msgplural, msgcount) = msgid
-            translator = lang.ngettext if six.PY3 else lang.ungettext
+            translator = lang.ngettext
             translated_message = translator(msgsingle, msgplural, msgcount)
 
         return translated_message

oslo_i18n/tests/test_message.py

@@ -168,10 +168,7 @@ class MessageTestCase(test_base.BaseTestCase):
             # Now set up ugettext to return the translated version of
             # the original message, with a bad format string.
             wrong_type = u'Wrong type %(arg1)d'
-            if six.PY3:
-                trans.return_value.gettext.return_value = wrong_type
-            else:
-                trans.return_value.ugettext.return_value = wrong_type
+            trans.return_value.gettext.return_value = wrong_type
             trans_result = result.translation()
             expected = msgid % params
             self.assertEqual(expected, trans_result)

oslo_i18n/tests/utils.py

@@ -12,18 +12,14 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import six
-
 
 class SomeObject(object):
 
     def __init__(self, message):
         self.message = message
 
-    def __unicode__(self):
+    def __str__(self):
         return self.message
-    # alias for Python 3
-    __str__ = __unicode__
 
 
 class NoDeepCopyObject(object):
@@ -31,12 +27,8 @@ class NoDeepCopyObject(object):
     def __init__(self, value):
         self.value = value
 
-    if six.PY3:
-        def __str__(self):
-            return str(self.value)
-    else:
-        def __unicode__(self):
-            return six.text_type(self.value)
+    def __str__(self):
+        return str(self.value)
 
     def __deepcopy__(self, memo):
         raise TypeError('Deep Copy not supported')