Fix various pylint violations

+ SchedUtils.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
+ VatHistory.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
+ VppCounters.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
+ Memif.py:
++ Do not use `len(SEQUENCE)` to determine if a sequence is empty
++ Either all return statements in a function should return an expression,
   or none of them should.
++ Update :return: on possible None.
+ Classify.py: Unnecessary "else" after "return"
+ ContainerUtils.py: Useless super delegation in method '__init__'
+ CpuUtils.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
+ DropRateSearch.py: Either all return statements in a function
  should return an expression, or none of them should.
+ IPv4NodeAddress.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
++ Also improve docstrings.
+ IPv4Setup.py: Useless super delegation in method '__init__'
+ IPv6Setup.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
++ Also improve docstrings.
+ IPv6Setup.py: standard import "from ipaddress import IPv6Network"
  should be placed before "from robot.api import logger"
+ MacSwap.py: Trailing newlines
+ NATUtil.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
+ NodePath.py: Unnecessary "else" after "return"
+ Tap.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
+ topology.py: Either all return statements in a function
  should return an expression, or none of them should.
+ topology.py: Unnecessary "else" after "return"
++ Do not use `len(SEQUENCE)` to determine if a sequence is empty
++ Improve docstrings
+ DUTSetup.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
++ Also do not compare int(ret_code) just to access zero-ness.
+ ssh.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
+ InterfaceUtil.py: Unnecessary "else" after "return"

Change-Id: Iba4244aa79661ee7df15fed5c7c6dbf04dfa88b2
Signed-off-by: Vratko Polak <vrpolak@cisco.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/resources/libraries/python/IPv4Setup.py b/resources/libraries/python/IPv4Setup.py
index f9b067d0d8..b018bceacf 100644
--- a/resources/libraries/python/IPv4Setup.py
+++ b/resources/libraries/python/IPv4Setup.py
@@ -118,8 +118,8 @@ class IPv4Node(object):
 
 class Tg(IPv4Node):
     """Traffic generator node"""
-    def __init__(self, node_info):
-        super(Tg, self).__init__(node_info)
+
+    # Implicit constructor is inherited.
 
     def _execute(self, cmd):
         """Executes the specified command on TG using SSH.
@@ -179,8 +179,8 @@ class Tg(IPv4Node):
 
 class Dut(IPv4Node):
     """Device under test"""
-    def __init__(self, node_info):
-        super(Dut, self).__init__(node_info)
+
+    # Implicit contructor is inherited.
 
     def get_sw_if_index(self, interface):
         """Get sw_if_index of specified interface from current node.