Pass code check with pylint=2.4.4 (#1012)

examples/multiping.py

@@ -8,14 +8,14 @@ multiple hosts and monitor their output interactively for a period=
 of time.
 """
 
+from select import poll, POLLIN
+from time import time
 
 from mininet.net import Mininet
 from mininet.node import Node
 from mininet.topo import SingleSwitchTopo
 from mininet.log import info, setLogLevel
 
-from select import poll, POLLIN
-from time import time
 
 def chunks( l, n ):
     "Divide list l into chunks of size n - thanks Stackoverflow"
@@ -59,7 +59,7 @@ def multiping( netsize, chunksize, seconds):
     # Start pings
     for subnet in subnets:
         ips = [ host.IP() for host in subnet ]
-        #adding bogus to generate packet loss
+        # adding bogus to generate packet loss
         ips.append( '10.0.0.200' )
         for host in subnet:
             startpings( host, ips )