Update hacking for Python3

The repo is Python 3 now, so update hacking to version 3.0 which
supports Python 3.

Fix problems found.

Remove hacking and friends from lower-constraints, they are not needed
for installation.

Change-Id: I3f23bf09ef24fe34e128102c34382da98e10f5c1

8 files changed, 9 insertions, 8 deletions

diff --git a/lower-constraints.txt b/lower-constraints.txt
index c27fe46..57f2769 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -7,11 +7,9 @@ debtcollector==1.2.0
 eventlet==0.18.2
 extras==1.0.0
 fixtures==3.0.0
-flake8==2.5.5
 funcsigs==1.0.0
 gitdb==0.6.4
 GitPython==1.0.1
-hacking==0.12.0
 iso8601==0.1.11
 keystoneauth1==3.4.0
 linecache2==1.0.0
@@ -24,8 +22,6 @@ oslo.config==5.2.0
 oslo.i18n==3.15.3
 oslotest==3.2.0
 pbr==2.0.0
-pep8==1.5.7
-pyflakes==0.8.1
 pyparsing==2.1.0
 python-mimeparse==1.6.0
 python-subunit==1.0.0
diff --git a/oslo_utils/imageutils.py b/oslo_utils/imageutils.py
index 82ea29d..fc7b494 100644
--- a/oslo_utils/imageutils.py
+++ b/oslo_utils/imageutils.py
@@ -45,7 +45,7 @@ class QemuImgInfo(object):
                                   r"\s+(.*?)\)\s*$"), re.I)
     TOP_LEVEL_RE = re.compile(r"^([\w\d\s\_\-]+):(.*)$")
     SIZE_RE = re.compile(r"([0-9]+[eE][-+][0-9]+|\d*\.?\d+)"
-                         "\s*(\w+)?(\s*\(\s*(\d+)\s+bytes\s*\))?",
+                         r"\s*(\w+)?(\s*\(\s*(\d+)\s+bytes\s*\))?",
                          re.I)
 
     def __init__(self, cmd_output=None, format='human'):
diff --git a/oslo_utils/secretutils.py b/oslo_utils/secretutils.py
index 963c634..ad350d2 100644
--- a/oslo_utils/secretutils.py
+++ b/oslo_utils/secretutils.py
@@ -39,6 +39,7 @@ def _constant_time_compare(first, second):
         result |= ord(x) ^ ord(y)
     return result == 0
 
+
 try:
     constant_time_compare = hmac.compare_digest
 except AttributeError:
diff --git a/oslo_utils/tests/test_imageutils.py b/oslo_utils/tests/test_imageutils.py
index 3a6bfec..6b3a9fa 100644
--- a/oslo_utils/tests/test_imageutils.py
+++ b/oslo_utils/tests/test_imageutils.py
@@ -137,6 +137,7 @@ class ImageUtilsRawTestCase(test_base.BaseTestCase):
         image_info = imageutils.QemuImgInfo(example_output)
         self._base_validation(image_info)
 
+
 ImageUtilsRawTestCase.generate_scenarios()
 
 
@@ -203,6 +204,7 @@ class ImageUtilsQemuTestCase(ImageUtilsRawTestCase):
         if self.encrypted is not None:
             self.assertEqual(image_info.encrypted, self.encrypted)
 
+
 ImageUtilsQemuTestCase.generate_scenarios()
 
 
diff --git a/oslo_utils/tests/test_strutils.py b/oslo_utils/tests/test_strutils.py
index 25e974c..a63ef23 100644
--- a/oslo_utils/tests/test_strutils.py
+++ b/oslo_utils/tests/test_strutils.py
@@ -291,6 +291,7 @@ class StringToBytesTest(test_base.BaseTestCase):
         else:
             self.assertAlmostEqual(actual, expected)
 
+
 StringToBytesTest.generate_scenarios()
 
 
diff --git a/test-requirements.txt b/test-requirements.txt
index ce63b70..ff549ff 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-hacking>=1.1.0,<1.2.0 # Apache-2.0
+hacking>=3.0,<3.1.0 # Apache-2.0
 
 eventlet>=0.18.2,!=0.18.3,!=0.20.1,!=0.21.0,!=0.23.0 # MIT
 fixtures>=3.0.0 # Apache-2.0/BSD
diff --git a/tools/perf_test_mask_password.py b/tools/perf_test_mask_password.py
index f69a734..e470766 100644
--- a/tools/perf_test_mask_password.py
+++ b/tools/perf_test_mask_password.py
@@ -37,7 +37,7 @@ print('payload has %d bytes' % len(input_str))
 for pattern in strutils._SANITIZE_PATTERNS_2['admin_pass']:
     print('\ntesting %s' % pattern.pattern)
     t = timeit.Timer(
-        "re.sub(pattern, r'\g<1>***\g<2>', payload)",
+        r"re.sub(pattern, r'\g<1>***\g<2>', payload)",
         """
 import re
 payload = '''%s'''
diff --git a/tox.ini b/tox.ini
index abffbe1..7297a5a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -37,7 +37,8 @@ commands = bandit -r oslo_utils -x tests -n5
 
 [flake8]
 # E731 skipped as assign a lambda expression
-ignore = E123,E731,H405
+# W504 line break after binary operator
+ignore = E123,E731,H405,W504
 show-source = True
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,__init__.py