[tests] fix nodehandling.py flake8 warnings

test/functional/nodehandling.py

@@ -3,11 +3,17 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test node handling."""
+import time
+import urllib.parse
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
-
-import urllib.parse
+from test_framework.util import (assert_equal,
+                                 assert_raises_jsonrpc,
+                                 connect_nodes_bi,
+                                 p2p_port,
+                                 start_node,
+                                 stop_node,
+                                 )
 
 class NodeHandlingTest(BitcoinTestFramework):
 
@@ -42,7 +48,7 @@ class NodeHandlingTest (BitcoinTestFramework):
         self.nodes[2].clearbanned()
         assert_equal(len(self.nodes[2].listbanned()), 0)
 
-        ##test persisted banlist
+        # test persisted banlist
         self.nodes[2].setban("127.0.0.0/32", "add")
         self.nodes[2].setban("127.0.0.0/24", "add")
         self.nodes[2].setban("192.168.0.1", "add", 1)  # ban for 1 seconds