Pass code check with pylint=2.4.4 (#1012)

examples/scratchnet.py

@@ -8,6 +8,7 @@ but it exposes the configuration details and allows customization.
 For most tasks, the higher-level API will be preferable.
 """
 
+from time import sleep
 
 from mininet.net import Mininet
 from mininet.node import Node
@@ -15,7 +16,6 @@ from mininet.link import Link
 from mininet.log import setLogLevel, info
 from mininet.util import quietRun
 
-from time import sleep
 
 def scratchNet( cname='controller', cargs='-v ptcp:' ):
     "Create network from scratch using Open vSwitch."
@@ -62,6 +62,7 @@ def scratchNet( cname='controller', cargs='-v ptcp:' ):
     switch.deleteIntfs()
     info( '\n' )
 
+
 if __name__ == '__main__':
     setLogLevel( 'info' )
     info( '*** Scratch network demo (kernel datapath)\n' )