diff --git a/test/functional/mempool_limit.py b/test/functional/mempool_limit.py
--- a/test/functional/mempool_limit.py
+++ b/test/functional/mempool_limit.py
@@ -5,8 +5,11 @@
 
 # Test mempool limiting together/eviction with the wallet
 
+from test_framework.blocktools import (
+    create_confirmed_utxos,
+    send_big_transactions,
+)
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.blocktools import send_big_transactions, create_confirmed_utxos
 
 
 class MempoolLimitTest(BitcoinTestFramework):
diff --git a/test/functional/mempool_packages.py b/test/functional/mempool_packages.py
--- a/test/functional/mempool_packages.py
+++ b/test/functional/mempool_packages.py
@@ -4,9 +4,17 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test descendant package tracking code."""
 
+from decimal import Decimal
+
+from test_framework.messages import COIN
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
-from test_framework.mininode import COIN
+from test_framework.util import (
+    assert_equal,
+    assert_raises_rpc_error,
+    satoshi_round,
+    sync_blocks,
+    sync_mempools,
+)
 
 MAX_ANCESTORS = 25
 MAX_DESCENDANTS = 25
diff --git a/test/functional/mempool_persist.py b/test/functional/mempool_persist.py
--- a/test/functional/mempool_persist.py
+++ b/test/functional/mempool_persist.py
@@ -30,10 +30,11 @@
     does not overwrite a previously valid mempool stored on disk.
 
 """
+from decimal import Decimal
 import time
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
+from test_framework.util import assert_equal, wait_until
 
 
 class MempoolPersistTest(BitcoinTestFramework):
diff --git a/test/functional/mempool_reorg.py b/test/functional/mempool_reorg.py
--- a/test/functional/mempool_reorg.py
+++ b/test/functional/mempool_reorg.py
@@ -9,7 +9,7 @@
 #
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
+from test_framework.util import assert_equal, assert_raises_rpc_error, create_tx
 
 # Create one-input, one-output, no-fee transaction:
 
diff --git a/test/functional/mempool_resurrect.py b/test/functional/mempool_resurrect.py
--- a/test/functional/mempool_resurrect.py
+++ b/test/functional/mempool_resurrect.py
@@ -9,7 +9,7 @@
 #
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
+from test_framework.util import assert_equal, create_tx
 
 # Create one-input, one-output, no-fee transaction:
 
diff --git a/test/functional/mempool_spend_coinbase.py b/test/functional/mempool_spend_coinbase.py
--- a/test/functional/mempool_spend_coinbase.py
+++ b/test/functional/mempool_spend_coinbase.py
@@ -14,8 +14,7 @@
 #
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
-
+from test_framework.util import assert_equal, assert_raises_rpc_error, create_tx
 # Create one-input, one-output, no-fee transaction: