Convert pep8 to flake8 for stx-nfv

Flake8 and Hacking offer stricter style checks than pep8.

This submission fixes these codes:
 E305 expected 2 blank lines after class or function definition, found 1
 E722 do not use bare except'
 F841 local variable 'blah' is assigned to but never used
 H101: Use TODO(NAME)
 H201: no 'except:' at least use 'except Exception:'
 H237: module commands is removed in Python 3
 H238: old style class declaration, use new style(inherit from `object`)

This submission enables 2 additional checks that are off by default
 H106 vim config in files
 H203 Use assertIs(Not)None to check for None

8 hacking codes and 2 flake8 types were added to the ignore list
and will be fixed by later updates.

An optional hacking code H904 will be enabled and the code fixed
by a later commit

Story: 2003499
Task: 26195
Change-Id: I48f99fc0dd41addc574c81cee6662600faeb8e75
Signed-off-by: Al Bailey <Al.Bailey@windriver.com>

nfv/nfv-debug-tools/histogram_analysis/Histogram.py

@@ -57,7 +57,7 @@ call("cp nfv-vim.log nfv-vim.log.[0-9] nfv-vim.log.[0-9][0-9] nfv-vim.log.[0-9].
 call("gunzip logs/nfv-vim.log.[0-9].gz logs/nfv-vim.log.[0-9][0-9].gz", shell=True)
 
 
-class Parser:
+class Parser(object):
     def __init__(self):
         self.proc="" # Name of process being read
         self.timestamp="" # Timestamp found on line stating process name
@@ -132,6 +132,7 @@ class Parser:
                     csvOut.write(line+"\n")
             csvOut.close()
 
+
 process=Parser()
 process.main()
 print("\nComplete\n")

nfv/nfv-debug-tools/histogram_analysis/plotter.py

@@ -48,7 +48,7 @@ import plotly.graph_objs as go
 from plotly.graph_objs import Scatter, Layout
 from plotly import tools
 from glob import iglob
-import commands
+import subprocess
 from builtins import input
 
 dir = os.path.dirname(__file__)
@@ -195,7 +195,6 @@ def gCommand(groups):
             liNum=i
             if str("GroupName="+g) == cfgLines[i].strip():
                 groupFound=True
-                linum=i
                 while not finishedGroup:
                     liNum+=1
                     if "GroupEND" in cfgLines[liNum]:
@@ -366,7 +365,7 @@ def setFilename(graphName):
 
 print("Welcome to plotter, type --help for information")
 # Checks that plotly is installed, otherwise graphs cannot be generated.
-plotCheck=commands.getstatusoutput("pip list | grep plotly")
+plotCheck=subprocess.getstatusoutput("pip list | grep plotly")
 if plotCheck[0]==0:
     if "plotly" not in plotCheck[1]:
         print("\n\tWARNING: Plotly is not installed on your system.\n\tPlease install it with: sudo pip install plotly\n")

nfv/nfv-plugins/nfv_plugins/nfvi_plugins/nfvi_infrastructure_api.py

@@ -122,7 +122,7 @@ class NFVIInfrastructureAPI(nfvi.api.v1.NFVIInfrastructureAPI):
 
     @staticmethod
     def _host_supports_kubernetes(personality):
-        # TODO: This check will disappear once kubernetes is the default
+        # TODO(bwensley): This check will disappear once kubernetes is the default
         if os.path.isfile('/etc/kubernetes/admin.conf'):
             return ('compute' in personality or 'controller' in personality)
         else:

nfv/nfv-tests/nfv_unit_tests/tests/test_instance.py

@@ -249,7 +249,7 @@ def fake_event_issue(a, b, c, d):
 @mock.patch('nfv_vim.tables._instance_table._instance_table', _instance_table)
 @mock.patch('nfv_vim.tables._instance_type_table._instance_type_table', _instance_type_table)
 @mock.patch('nfv_vim.tables._image_table._image_table', _image_table)
-class TestInstance:
+class TestInstance(object):
 
     def setup(self):
         """

nfv/nfv-tests/nfv_unit_tests/tests/test_sw_patch_strategy.py

@@ -297,7 +297,7 @@ def fake_event_issue(a, b, c, d):
 @mock.patch('nfv_vim.tables._host_aggregate_table._host_aggregate_table', _host_aggregate_table)
 @mock.patch('nfv_vim.tables._instance_table._instance_table', _instance_table)
 @mock.patch('nfv_vim.strategy._strategy.get_local_host_name', fake_host_name)
-class TestSwPatchStrategy:
+class TestSwPatchStrategy(object):
 
     def setup(self):
         """

nfv/nfv-tests/nfv_unit_tests/tests/test_sw_upgrade_strategy.py

@@ -304,7 +304,7 @@ def fake_event_issue(a, b, c, d):
 @mock.patch('nfv_vim.tables._host_group_table._host_group_table', _host_group_table)
 @mock.patch('nfv_vim.tables._host_aggregate_table._host_aggregate_table', _host_aggregate_table)
 @mock.patch('nfv_vim.tables._instance_table._instance_table', _instance_table)
-class TestSwUpgradeStrategy:
+class TestSwUpgradeStrategy(object):
 
     def setup(self):
         """

nova-api-proxy/nova-api-proxy/nova_api_proxy/common/histogram.py

@@ -105,6 +105,7 @@ class Histogram(object):
                              '*' * min(60, bucket_value)))
         LOG.info("%s" % '-' * 120)
 
+
 _histograms = list()
 
 

nova-api-proxy/nova-api-proxy/nova_api_proxy/common/log.py

@@ -35,6 +35,7 @@ class ProxySysLogHandler(SysLogHandler):
         msg = logging.handlers.SysLogHandler.format(self, record)
         return self.binary_name + '(' + self.app + ')' + ': ' + msg
 
+
 _loggers = {}
 
 

nova-api-proxy/nova-api-proxy/nova_api_proxy/common/timestamp.py

@@ -15,11 +15,12 @@ class timespec(ctypes.Structure):
     """
     _fields_ = [('tv_sec', ctypes.c_long), ('tv_nsec', ctypes.c_long)]
 
+
 try:
     librt = ctypes.CDLL('librt.so.1', use_errno=True)
     clock_gettime = librt.clock_gettime
     clock_gettime.argtypes = [ctypes.c_int, ctypes.POINTER(timespec)]
-except:
+except Exception:
     raise OSError("Could not load librt.so.1 library")
 
 

tox.ini

@@ -24,7 +24,7 @@ commands =
             -o -type f -name '*.yaml'       \
             -print0 | xargs -0 yamllint"
 
-[pep8]
+[flake8]
 # Temporarily ignoring these warnings
 # E116 unexpected indentation (comment)
 # E121 continuation line under-indented for hanging indent
@@ -43,16 +43,34 @@ commands =
 # E265 block comment should start with '# '
 # E501 line too long
 # E712 comparison to bool should be reworded
-
-ignore = E116,E121,E122,E123,E124,E126,E127,E128,E129,E225,E226,E231,E241,E261,E265,E501,E712
+# - hacking codes -
+# H102: license header not found
+# H104: File contains nothing but comments
+# H301: one import per line
+# H306: imports not in alphabetical order
+# H401: docstring should not start with a space
+# H404: multi line docstring should start without a leading new line
+# H405: multi line docstring summary not separated with an empty line
+# H501: Do not use self.__dict__ for string formatting
+# - flake8 codes -
+# F401 '<module>' imported but unused
+# F821 undefined name 'unicode' (python3 specific)
+ignore = E116,E121,E122,E123,E124,E126,E127,E128,E129,E225,E226,E231,E241,E261,E265,E501,E712,
+         H102,H104,H301,H306,H401,H404,H405,H501,
+         F401,F821,
+# H106 Don’t put vim configuration in source files (off by default).
+# H203 Use assertIs(Not)None to check for None (off by default).
+# TODO: enable: H904 Delay string interpolations at logging calls (off by default).
+enable-extensions = H106,H203
 
 [testenv:pep8]
 usedevelop = False
 skip_install = True
 deps =
-    pep8
+    hacking
+    flake8
 commands =
-    pep8
+    flake8
 
 [testenv:venv]
 commands = {posargs}