diff --git a/test/functional/abc-finalize-block.py b/test/functional/abc-finalize-block.py
--- a/test/functional/abc-finalize-block.py
+++ b/test/functional/abc-finalize-block.py
@@ -91,7 +91,7 @@
         wait_for_block(node, invalid_block)
 
         # Later block headers are rejected
-        for i in range(2, 9):
+        for _ in range(2, 9):
             alt_node.generatetoaddress(
                 1, alt_node.get_deterministic_priv_key().address)
             assert_raises_rpc_error(-5, RPC_BLOCK_NOT_FOUND_ERROR,
diff --git a/test/functional/abc-magnetic-anomaly-mining.py b/test/functional/abc-magnetic-anomaly-mining.py
--- a/test/functional/abc-magnetic-anomaly-mining.py
+++ b/test/functional/abc-magnetic-anomaly-mining.py
@@ -43,7 +43,7 @@
 
         # Generate some unspent utxos and also
         # activate magnetic anomaly
-        for x in range(150):
+        for _ in range(150):
             update_time()
             mining_node.generate(1)
 
diff --git a/test/functional/abc-parkedchain.py b/test/functional/abc-parkedchain.py
--- a/test/functional/abc-parkedchain.py
+++ b/test/functional/abc-parkedchain.py
@@ -179,7 +179,7 @@
                 nblocks=depth,
                 address=node.getnewaddress(label='coinbase'))
             # extra block should now find themselves parked
-            for i in range(extra_blocks):
+            for _ in range(extra_blocks):
                 node.generate(1)
                 wait_for_parked_block(node.getbestblockhash())
 
diff --git a/test/functional/abc-sync-chain.py b/test/functional/abc-sync-chain.py
--- a/test/functional/abc-sync-chain.py
+++ b/test/functional/abc-sync-chain.py
@@ -45,7 +45,7 @@
         time = node0.getblock(node0.getbestblockhash())['time'] + 1
 
         blocks = []
-        for i in range(NUM_IBD_BLOCKS * 2):
+        for _ in range(NUM_IBD_BLOCKS * 2):
             block = create_block(tip, create_coinbase(height), time)
             block.solve()
             blocks.append(block)
diff --git a/test/functional/abc_rpc_getavalanchepeerinfo.py b/test/functional/abc_rpc_getavalanchepeerinfo.py
--- a/test/functional/abc_rpc_getavalanchepeerinfo.py
+++ b/test/functional/abc_rpc_getavalanchepeerinfo.py
@@ -46,8 +46,8 @@
             return (pubkey.get_bytes().hex(), proof)
 
         # Create peercount * nodecount node array
-        nodes = [[get_ava_p2p_interface(node) for n in range(
-            nodecount)] for p in range(peercount)]
+        nodes = [[get_ava_p2p_interface(node) for _ in range(
+            nodecount)] for _ in range(peercount)]
 
         # Add peercount peers and bind all the nodes to each
         proofs = []
diff --git a/test/functional/test_runner.py b/test/functional/test_runner.py
--- a/test/functional/test_runner.py
+++ b/test/functional/test_runner.py
@@ -559,7 +559,7 @@
     resultCollector.start()
 
     # Start some worker threads
-    for job in range(num_jobs):
+    for _ in range(num_jobs):
         t = threading.Thread(target=handle_test_cases)
         t.daemon = True
         t.start()
@@ -576,7 +576,7 @@
 
     # Flush our queues so the threads exit
     update_queue.put(None)
-    for job in range(num_jobs):
+    for _ in range(num_jobs):
         job_queue.put(None)
 
     return test_results