Remove hacking rules to enforce six usage

... because these rules are no longer valid since usage of six library
was removed[1].

This also removes the remaining implementations to keep compatibility
with Python 2.

[1] 4bc6162515

Change-Id: If93609a56e341ff313063c0aa069d140528257b0

HACKING.rst

@@ -9,8 +9,3 @@ Mistral Specific Commandments
 - [M001] Use LOG.warning(). LOG.warn() is deprecated.
 - [M319] Enforce use of assertTrue/assertFalse
 - [M320] Enforce use of assertIs/assertIsNot
-- [M327] Do not use xrange(). xrange() is not compatible with Python 3. Use
-  range() or six.moves.range() instead.
-- [M328] Python 3: do not use dict.iteritems.
-- [M329] Python 3: do not use dict.iterkeys.
-- [M330] Python 3: do not use dict.itervalues.

mistral/hacking/checks.py

@@ -81,37 +81,6 @@ def check_oslo_namespace_imports(logical_line):
         yield (0, msg)
 
 
-@core.flake8ext
-def check_python3_xrange(logical_line):
-    if re.search(r"\bxrange\s*\(", logical_line):
-        yield (0, "M327: Do not use xrange(). 'xrange()' is not compatible "
-               "with Python 3. Use range() or range() instead.")
-
-
-@core.flake8ext
-def check_python3_no_iteritems(logical_line):
-    msg = ("M328: Use six.iteritems() instead of dict.iteritems().")
-
-    if re.search(r".*\.iteritems\(\)", logical_line):
-        yield (0, msg)
-
-
-@core.flake8ext
-def check_python3_no_iterkeys(logical_line):
-    msg = ("M329: Use six.iterkeys() instead of dict.iterkeys().")
-
-    if re.search(r".*\.iterkeys\(\)", logical_line):
-        yield (0, msg)
-
-
-@core.flake8ext
-def check_python3_no_itervalues(logical_line):
-    msg = ("M330: Use six.itervalues() instead of dict.itervalues().")
-
-    if re.search(r".*\.itervalues\(\)", logical_line):
-        yield (0, msg)
-
-
 class BaseASTChecker(ast.NodeVisitor):
     """Provides a simple framework for writing AST-based checks.
 

mistral/tests/unit/hacking/test_checks.py

@@ -93,34 +93,6 @@ class BaseLoggingCheckTest(base.BaseTest):
         self._assert_has_errors(code, checks.no_assert_true_false_is_not,
                                 expected_errors=errors)
 
-    def test_check_python3_xrange(self):
-        func = checks.check_python3_xrange
-        self.assertEqual(1, len(list(func('for i in xrange(10)'))))
-        self.assertEqual(1, len(list(func('for i in xrange    (10)'))))
-        self.assertEqual(0, len(list(func('for i in range(10)'))))
-        self.assertEqual(0, len(list(func('for i in range(10)'))))
-
-    def test_dict_iteritems(self):
-        self.assertEqual(1, len(list(checks.check_python3_no_iteritems(
-            "obj.iteritems()"))))
-
-        self.assertEqual(0, len(list(checks.check_python3_no_iteritems(
-            "six.iteritems(ob))"))))
-
-    def test_dict_iterkeys(self):
-        self.assertEqual(1, len(list(checks.check_python3_no_iterkeys(
-            "obj.iterkeys()"))))
-
-        self.assertEqual(0, len(list(checks.check_python3_no_iterkeys(
-            "six.iterkeys(ob))"))))
-
-    def test_dict_itervalues(self):
-        self.assertEqual(1, len(list(checks.check_python3_no_itervalues(
-            "obj.itervalues()"))))
-
-        self.assertEqual(0, len(list(checks.check_python3_no_itervalues(
-            "six.itervalues(ob))"))))
-
 
 class TestLoggingWithWarn(BaseLoggingCheckTest):
 

mistral/workflow/data_flow.py

@@ -87,24 +87,6 @@ class ContextView(dict):
     def values(self):
         return [self[k] for k in self.keys()]
 
-    def iteritems(self):
-        # NOTE: This is for compatibility with Python 2.7
-        # YAQL converts output objects after they are evaluated
-        # to basic types and it uses six.iteritems() internally
-        # which calls d.items() in case of Python 2.7 and d.iteritems()
-        # for Python 2.7
-        return iter(self.items())
-
-    def iterkeys(self):
-        # NOTE: This is for compatibility with Python 2.7
-        # See the comment for iteritems().
-        return iter(self.keys())
-
-    def itervalues(self):
-        # NOTE: This is for compatibility with Python 2.7
-        # See the comment for iteritems().
-        return iter(self.values())
-
     def __len__(self):
         return len(self.keys())
 

tox.ini

@@ -134,9 +134,5 @@ extension =
     M001 = checks:CheckForLoggingIssues
     M319 = checks:no_assert_equal_true_false
     M320 = checks:no_assert_true_false_is_not
-    M327 = checks:check_python3_xrange
-    M328 = checks:check_python3_no_iteritems
-    M329 = checks:check_python3_no_iterkeys
-    M330 = checks:check_python3_no_itervalues
     O323 = checks:check_oslo_namespace_imports
 paths = ./mistral/hacking