diff --git a/test/functional/wallet_abandonconflict.py b/test/functional/wallet_abandonconflict.py
--- a/test/functional/wallet_abandonconflict.py
+++ b/test/functional/wallet_abandonconflict.py
@@ -10,9 +10,18 @@
  which are not included in a block and are not currently in the mempool. It has
  no effect on transactions which are already conflicted or abandoned.
 """
+from decimal import Decimal
+
+from test_framework.messages import CTransaction, FromHex
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
-from test_framework.mininode import *
+from test_framework.util import (
+    assert_equal,
+    connect_nodes,
+    disconnect_nodes,
+    satoshi_round,
+    sync_blocks,
+    sync_mempools,
+)
 
 
 class AbandonConflictTest(BitcoinTestFramework):
diff --git a/test/functional/wallet_backup.py b/test/functional/wallet_backup.py
--- a/test/functional/wallet_backup.py
+++ b/test/functional/wallet_backup.py
@@ -30,11 +30,19 @@
 Shutdown again, restore using importwallet,
 and confirm again balances are correct.
 """
+from decimal import Decimal
+import os
 from random import randint
 import shutil
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
+from test_framework.util import (
+    assert_equal,
+    assert_raises_rpc_error,
+    connect_nodes,
+    sync_blocks,
+    sync_mempools,
+)
 
 
 class WalletBackupTest(BitcoinTestFramework):
diff --git a/test/functional/wallet_basic.py b/test/functional/wallet_basic.py
--- a/test/functional/wallet_basic.py
+++ b/test/functional/wallet_basic.py
@@ -3,9 +3,21 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test the wallet."""
+from decimal import Decimal
+import time
+
+from test_framework.messages import FromHex, CTransaction
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
-from test_framework.mininode import *
+from test_framework.util import (
+    assert_array_result,
+    assert_equal,
+    assert_fee_amount,
+    assert_raises_rpc_error,
+    connect_nodes_bi,
+    count_bytes,
+    sync_blocks,
+    sync_mempools,
+)
 
 
 class WalletTest(BitcoinTestFramework):
diff --git a/test/functional/wallet_disable.py b/test/functional/wallet_disable.py
--- a/test/functional/wallet_disable.py
+++ b/test/functional/wallet_disable.py
@@ -9,7 +9,7 @@
 """
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
+from test_framework.util import assert_raises_rpc_error
 
 
 class DisableWalletTest (BitcoinTestFramework):
diff --git a/test/functional/wallet_dump.py b/test/functional/wallet_dump.py
--- a/test/functional/wallet_dump.py
+++ b/test/functional/wallet_dump.py
@@ -7,7 +7,7 @@
 import os
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import (assert_equal, assert_raises_rpc_error)
+from test_framework.util import assert_equal, assert_raises_rpc_error
 
 
 def read_dump(file_name, addrs, script_addrs, hd_master_addr_old):
diff --git a/test/functional/wallet_hd.py b/test/functional/wallet_hd.py
--- a/test/functional/wallet_hd.py
+++ b/test/functional/wallet_hd.py
@@ -4,13 +4,11 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test Hierarchical Deterministic wallet function."""
 
-from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import (
-    assert_equal,
-    connect_nodes_bi,
-)
-import shutil
 import os
+import shutil
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal, connect_nodes_bi
 
 
 class WalletHDTest(BitcoinTestFramework):
diff --git a/test/functional/wallet_import_rescan.py b/test/functional/wallet_import_rescan.py
--- a/test/functional/wallet_import_rescan.py
+++ b/test/functional/wallet_import_rescan.py
@@ -18,14 +18,20 @@
 happened previously.
 '''
 
-from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import (
-    assert_raises_rpc_error, connect_nodes, sync_blocks, assert_equal, set_node_times)
-
 import collections
 import enum
 import itertools
 
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import (
+    assert_equal,
+    assert_raises_rpc_error,
+    connect_nodes,
+    set_node_times,
+    sync_blocks,
+)
+
+
 Call = enum.Enum("Call", "single multi")
 Data = enum.Enum("Data", "address pub priv")
 Rescan = enum.Enum("Rescan", "no yes late_timestamp")
diff --git a/test/functional/wallet_importmulti.py b/test/functional/wallet_importmulti.py
--- a/test/functional/wallet_importmulti.py
+++ b/test/functional/wallet_importmulti.py
@@ -4,7 +4,11 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
+from test_framework.util import (
+    assert_equal,
+    assert_greater_than,
+    assert_raises_rpc_error,
+)
 
 
 class ImportMultiTest (BitcoinTestFramework):
diff --git a/test/functional/wallet_importprunedfunds.py b/test/functional/wallet_importprunedfunds.py
--- a/test/functional/wallet_importprunedfunds.py
+++ b/test/functional/wallet_importprunedfunds.py
@@ -3,8 +3,10 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+from decimal import Decimal
+
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
+from test_framework.util import assert_equal, assert_raises_rpc_error
 
 
 class ImportPrunedFundsTest(BitcoinTestFramework):
diff --git a/test/functional/wallet_keypool.py b/test/functional/wallet_keypool.py
--- a/test/functional/wallet_keypool.py
+++ b/test/functional/wallet_keypool.py
@@ -4,9 +4,10 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 # Exercise the wallet keypool, and interaction with wallet encryption/locking
+import time
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
+from test_framework.util import assert_equal, assert_raises_rpc_error
 
 
 class KeyPoolTest(BitcoinTestFramework):
diff --git a/test/functional/wallet_listreceivedby.py b/test/functional/wallet_listreceivedby.py
--- a/test/functional/wallet_listreceivedby.py
+++ b/test/functional/wallet_listreceivedby.py
@@ -7,10 +7,11 @@
 from decimal import Decimal
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import (assert_array_result,
-                                 assert_equal,
-                                 assert_raises_rpc_error,
-                                 )
+from test_framework.util import (
+    assert_array_result,
+    assert_equal,
+    assert_raises_rpc_error,
+)
 
 
 class ReceivedByTest(BitcoinTestFramework):
diff --git a/test/functional/wallet_txn_clone.py b/test/functional/wallet_txn_clone.py
--- a/test/functional/wallet_txn_clone.py
+++ b/test/functional/wallet_txn_clone.py
@@ -5,7 +5,12 @@
 """Test the wallet accounts properly when there are cloned transactions with malleated scriptsigs."""
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
+from test_framework.util import (
+    assert_equal,
+    connect_nodes,
+    disconnect_nodes,
+    sync_blocks,
+)
 
 
 class TxnMallTest(BitcoinTestFramework):
diff --git a/test/functional/wallet_txn_doublespend.py b/test/functional/wallet_txn_doublespend.py
--- a/test/functional/wallet_txn_doublespend.py
+++ b/test/functional/wallet_txn_doublespend.py
@@ -3,9 +3,16 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test the wallet accounts properly when there is a double-spend conflict."""
+from decimal import Decimal
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
+from test_framework.util import (
+    assert_equal,
+    connect_nodes,
+    disconnect_nodes,
+    find_output,
+    sync_blocks,
+)
 
 
 class TxnMallTest(BitcoinTestFramework):