python: Pylint 1.8.2 code conformity

Updated master Python scripts to conform to the newer pylint
1.8.2 standard.

JIRA: VSPERF-563

Change-Id: I19305a008a2e22c2f4841aa83fed85fbdc2d549c
Signed-off-by: Richard Elias <richardx.elias@intel.com>
Reviewed-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Al Morton <acmorton@att.com>
Reviewed-by: Christian Trautman <ctrautma@redhat.com>
Reviewed-by: Sridhar Rao <sridhar.rao@spirent.com>

3 files changed, 35 insertions, 33 deletions

diff --git a/vswitches/__init__.py b/vswitches/__init__.py
index a34475be..20a715e0 100644
--- a/vswitches/__init__.py
+++ b/vswitches/__init__.py
@@ -17,4 +17,3 @@
 This package contains an interface the VSPERF core uses for controlling
 vSwitches and vSwitch-specific implementation modules of this interface.
 """
-
diff --git a/vswitches/ovs.py b/vswitches/ovs.py
index 76cabb0d..9e49b2ee 100644
--- a/vswitches/ovs.py
+++ b/vswitches/ovs.py
@@ -166,7 +166,7 @@ class IVSwitchOvs(IVSwitch, tasks.Process):
 
         """
         if switch_name is None or remote_switch_name is None:
-            return
+            return None
 
         bridge = self._bridges[switch_name]
         remote_bridge = self._bridges[remote_switch_name]
@@ -382,7 +382,7 @@ class IVSwitchOvs(IVSwitch, tasks.Process):
             with open(self._ovsdb_pidfile_path, "r") as pidfile:
                 ovsdb_pid = pidfile.read().strip()
 
-            self._logger.info("Killing ovsdb with pid: " + ovsdb_pid)
+            self._logger.info("Killing ovsdb with pid: %s", ovsdb_pid)
 
             if ovsdb_pid:
                 tasks.terminate_task(ovsdb_pid, logger=self._logger)
@@ -409,7 +409,7 @@ class IVSwitchOvs(IVSwitch, tasks.Process):
     #
     # validate methods required for integration testcases
     #
-    def validate_add_switch(self, dummy_result, switch_name, dummy_params=None):
+    def validate_add_switch(self, _dummy_result, switch_name, _dummy_params=None):
         """Validate - Create a new logical switch with no ports
         """
         bridge = self._bridges[switch_name]
@@ -420,7 +420,7 @@ class IVSwitchOvs(IVSwitch, tasks.Process):
 
     # Method could be a function
     # pylint: disable=no-self-use
-    def validate_del_switch(self, dummy_result, switch_name):
+    def validate_del_switch(self, _dummy_result, switch_name):
         """Validate removal of switch
         """
         bridge = OFBridge('tmp')
@@ -444,7 +444,7 @@ class IVSwitchOvs(IVSwitch, tasks.Process):
         """
         return self.validate_add_phy_port(result, switch_name)
 
-    def validate_del_port(self, dummy_result, switch_name, port_name):
+    def validate_del_port(self, _dummy_result, switch_name, port_name):
         """ Validate that port_name was removed from bridge.
         """
         bridge = self._bridges[switch_name]
@@ -453,7 +453,7 @@ class IVSwitchOvs(IVSwitch, tasks.Process):
         assert 'Port "%s"' % port_name not in output[0]
         return True
 
-    def validate_add_flow(self, dummy_result, switch_name, flow, dummy_cache='off'):
+    def validate_add_flow(self, _dummy_result, switch_name, flow, _dummy_cache='off'):
         """ Validate insertion of the flow into the switch
         """
 
@@ -474,44 +474,44 @@ class IVSwitchOvs(IVSwitch, tasks.Process):
                 return True
         return False
 
-    def validate_del_flow(self, dummy_result, switch_name, flow=None):
+    def validate_del_flow(self, _dummy_result, switch_name, flow=None):
         """ Validate removal of the flow
         """
         if not flow:
             # what else we can do?
             return True
-        return not self.validate_add_flow(dummy_result, switch_name, flow)
+        return not self.validate_add_flow(_dummy_result, switch_name, flow)
 
-    def validate_dump_flows(self, dummy_result, dummy_switch_name):
+    def validate_dump_flows(self, _dummy_result, _dummy_switch_name):
         """ Validate call of flow dump
         """
         return True
 
-    def validate_disable_rstp(self, dummy_result, switch_name):
+    def validate_disable_rstp(self, _dummy_result, switch_name):
         """ Validate rstp disable
         """
         bridge = self._bridges[switch_name]
         return 'rstp_enable         : false' in ''.join(bridge.bridge_info())
 
-    def validate_enable_rstp(self, dummy_result, switch_name):
+    def validate_enable_rstp(self, _dummy_result, switch_name):
         """ Validate rstp enable
         """
         bridge = self._bridges[switch_name]
         return 'rstp_enable         : true' in ''.join(bridge.bridge_info())
 
-    def validate_disable_stp(self, dummy_result, switch_name):
+    def validate_disable_stp(self, _dummy_result, switch_name):
         """ Validate stp disable
         """
         bridge = self._bridges[switch_name]
         return 'stp_enable          : false' in ''.join(bridge.bridge_info())
 
-    def validate_enable_stp(self, dummy_result, switch_name):
+    def validate_enable_stp(self, _dummy_result, switch_name):
         """ Validate stp enable
         """
         bridge = self._bridges[switch_name]
         return 'stp_enable          : true' in ''.join(bridge.bridge_info())
 
-    def validate_restart(self, dummy_result):
+    def validate_restart(self, _dummy_result):
         """ Validate restart
         """
         return True
diff --git a/vswitches/vpp_dpdk_vhost.py b/vswitches/vpp_dpdk_vhost.py
index 58d6bf51..bdb5ff81 100644
--- a/vswitches/vpp_dpdk_vhost.py
+++ b/vswitches/vpp_dpdk_vhost.py
@@ -205,6 +205,7 @@ class VppDpdkVhost(IVSwitch, tasks.Process):
     def add_switch(self, switch_name, dummy_params=None):
         """See IVswitch for general description
         """
+        # pylint: disable=unused-argument
         if switch_name in self._switches:
             self._logger.warning("switch %s already exists...", switch_name)
         else:
@@ -221,6 +222,7 @@ class VppDpdkVhost(IVSwitch, tasks.Process):
         """See IVswitch for general description
         :raises: RuntimeError
         """
+        # pylint: disable=unused-argument
         # get list of physical interfaces with PCI addresses
         vpp_nics = self._get_nic_info(key='Pci')
         # check if there are any NICs left
@@ -239,6 +241,7 @@ class VppDpdkVhost(IVSwitch, tasks.Process):
     def add_vport(self, dummy_switch_name):
         """See IVswitch for general description
         """
+        # pylint: disable=unused-argument
         socket_name = S.getValue('TOOLS')['ovs_var_tmp'] + 'dpdkvhostuser' + str(len(self._virt_ports))
         if S.getValue('VSWITCH_VHOSTUSER_SERVER_MODE'):
             mode = ['server']
@@ -280,7 +283,7 @@ class VppDpdkVhost(IVSwitch, tasks.Process):
         if bidir:
             self.run_vppctl(['set', 'interface', 'l2', 'xconnect', port2, port1])
 
-    def add_bridge(self, switch_name, port1, port2, dummy_bidir=False):
+    def add_bridge(self, switch_name, port1, port2, _dummy_bidir=False):
         """Add given ports to bridge ``switch_name``
         """
         self.run_vppctl(['set', 'interface', 'l2', 'bridge', port1,
@@ -301,7 +304,7 @@ class VppDpdkVhost(IVSwitch, tasks.Process):
         elif mode == 'bridge':
             self.add_bridge(switch_name, port1, port2)
         else:
-            raise RuntimeError('VPP: Unsupported l2 connection mode detected %s', mode)
+            raise RuntimeError('VPP: Unsupported l2 connection mode detected %s' % mode)
 
     def del_l2patch(self, port1, port2, bidir=False):
         """Remove l2patch connection between given ports
@@ -314,12 +317,12 @@ class VppDpdkVhost(IVSwitch, tasks.Process):
         if bidir:
             self.run_vppctl(['test', 'l2patch', 'rx', port2, 'tx', port1, 'del'])
 
-    def del_xconnect(self, dummy_port1, dummy_port2, dummy_bidir=False):
+    def del_xconnect(self, _dummy_port1, _dummy_port2, _dummy_bidir=False):
         """Remove xconnect connection between given ports
         """
         self._logger.warning('VPP: Removal of l2 xconnect is not implemented.')
 
-    def del_bridge(self, dummy_switch_name, dummy_port1, dummy_port2):
+    def del_bridge(self, _dummy_switch_name, _dummy_port1, _dummy_port2):
         """Remove given ports from the bridge
         """
         self._logger.warning('VPP: Removal of interfaces from bridge is not implemented.')
@@ -337,7 +340,7 @@ class VppDpdkVhost(IVSwitch, tasks.Process):
         elif mode == 'bridge':
             self.del_bridge(switch_name, port1, port2)
         else:
-            raise RuntimeError('VPP: Unsupported l2 connection mode detected %s', mode)
+            raise RuntimeError('VPP: Unsupported l2 connection mode detected %s' % mode)
 
     def dump_l2patch(self):
         """Dump l2patch connections
@@ -369,7 +372,7 @@ class VppDpdkVhost(IVSwitch, tasks.Process):
         elif mode == 'bridge':
             self.dump_bridge(switch_name)
         else:
-            raise RuntimeError('VPP: Unsupported l2 connection mode detected %s', mode)
+            raise RuntimeError('VPP: Unsupported l2 connection mode detected %s' % mode)
 
     def run_vppctl(self, args, check_error=False):
         """Run ``vppctl`` with supplied arguments.
@@ -385,50 +388,50 @@ class VppDpdkVhost(IVSwitch, tasks.Process):
     #
     # Validate methods
     #
-    def validate_add_switch(self, dummy_result, switch_name, dummy_params=None):
+    def validate_add_switch(self, _dummy_result, switch_name, _dummy_params=None):
         """Validate - Create a new logical switch with no ports
         """
         return switch_name in self._switches
 
-    def validate_del_switch(self, dummy_result, switch_name):
+    def validate_del_switch(self, _dummy_result, switch_name):
         """Validate removal of switch
         """
-        return not self.validate_add_switch(dummy_result, switch_name)
+        return not self.validate_add_switch(_dummy_result, switch_name)
 
-    def validate_add_phy_port(self, result, dummy_switch_name):
+    def validate_add_phy_port(self, result, _dummy_switch_name):
         """ Validate that physical port was added to bridge.
         """
         return result[0] in self._phy_ports
 
-    def validate_add_vport(self, result, dummy_switch_name):
+    def validate_add_vport(self, result, _dummy_switch_name):
         """ Validate that virtual port was added to bridge.
         """
         return result[0] in self._virt_ports
 
-    def validate_del_port(self, dummy_result, dummy_switch_name, port_name):
+    def validate_del_port(self, _dummy_result, _dummy_switch_name, port_name):
         """ Validate that port_name was removed from bridge.
         """
         return not (port_name in self._phy_ports or port_name in self._virt_ports)
 
     # pylint: disable=no-self-use
-    def validate_add_connection(self, dummy_result, dummy_switch_name, dummy_port1,
-                                dummy_port2, dummy_bidir=False):
+    def validate_add_connection(self, _dummy_result, _dummy_switch_name, _dummy_port1,
+                                _dummy_port2, _dummy_bidir=False):
         """ Validate that connection was added
         """
         return True
 
-    def validate_del_connection(self, dummy_result, dummy_switch_name, dummy_port1,
-                                dummy_port2, dummy_bidir=False):
+    def validate_del_connection(self, _dummy_result, _dummy_switch_name, _dummy_port1,
+                                _dummy_port2, _dummy_bidir=False):
         """ Validate that connection was deleted
         """
         return True
 
-    def validate_dump_connections(self, dummy_result, dummy_switch_name):
+    def validate_dump_connections(self, _dummy_result, _dummy_switch_name):
         """ Validate dump connections call
         """
         return True
 
-    def validate_run_vppctl(self, result, dummy_args, dummy_check_error=False):
+    def validate_run_vppctl(self, result, _dummy_args, _dummy_check_error=False):
         """validate execution of ``vppctl`` with supplied arguments.
         """
         # there shouldn't be any stderr