diff --git a/contrib/linearize/linearize-hashes.py b/contrib/linearize/linearize-hashes.py
index 804ab34d65..695bafad34 100755
--- a/contrib/linearize/linearize-hashes.py
+++ b/contrib/linearize/linearize-hashes.py
@@ -78,7 +78,7 @@ def get_block_hashes(settings, max_blocks_per_call=10000):
             if rpc.response_is_error(resp_obj):
                 print('JSON-RPC: error at height', height+x, ': ', resp_obj['error'], file=sys.stderr)
                 sys.exit(1)
-            assert(resp_obj['id'] == x) # assume replies are in-sequence
+            assert resp_obj['id'] == x  # assume replies are in-sequence
             if settings['rev_hash_bytes'] == 'true':
                 resp_obj['result'] = bytes.fromhex(resp_obj['result'])[::-1].hex()
             print(resp_obj['result'])
diff --git a/contrib/seeds/generate-seeds.py b/contrib/seeds/generate-seeds.py
index 44345e3987..a6f435af0d 100755
--- a/contrib/seeds/generate-seeds.py
+++ b/contrib/seeds/generate-seeds.py
@@ -70,13 +70,13 @@ def name_to_bip155(addr):
                 if i == 0 or i == (len(addr)-1): # skip empty component at beginning or end
                     continue
                 x += 1 # :: skips to suffix
-                assert(x < 2)
+                assert x < 2
             else: # two bytes per component
                 val = int(comp, 16)
                 sub[x].append(val >> 8)
                 sub[x].append(val & 0xff)
         nullbytes = 16 - len(sub[0]) - len(sub[1])
-        assert((x == 0 and nullbytes == 0) or (x == 1 and nullbytes > 0))
+        assert (x == 0 and nullbytes == 0) or (x == 1 and nullbytes > 0)
         addr_bytes = bytes(sub[0] + ([0] * nullbytes) + sub[1])
         if addr_bytes[0] == 0xfc:
             # Assume that seeds with fc00::/8 addresses belong to CJDNS,
diff --git a/test/functional/feature_coinstatsindex.py b/test/functional/feature_coinstatsindex.py
index 30cf559c43..eff4d9b149 100755
--- a/test/functional/feature_coinstatsindex.py
+++ b/test/functional/feature_coinstatsindex.py
@@ -221,7 +221,7 @@ class CoinStatsIndexTest(BitcoinTestFramework):
 
         self.generate(index_node, 1, sync_fun=self.no_op)
         res10 = index_node.gettxoutsetinfo('muhash')
-        assert(res8['txouts'] < res10['txouts'])
+        assert res8['txouts'] < res10['txouts']
 
         self.log.info("Test that the index works with -reindex")
 
@@ -268,12 +268,12 @@ class CoinStatsIndexTest(BitcoinTestFramework):
         res2 = index_node.gettxoutsetinfo(hash_type='muhash', hash_or_height=112)
         assert_equal(res["bestblock"], block)
         assert_equal(res["muhash"], res2["muhash"])
-        assert(res["muhash"] != res_invalid["muhash"])
+        assert res["muhash"] != res_invalid["muhash"]
 
         # Test that requesting reorged out block by hash is still returning correct results
         res_invalid2 = index_node.gettxoutsetinfo(hash_type='muhash', hash_or_height=reorg_block)
         assert_equal(res_invalid2["muhash"], res_invalid["muhash"])
-        assert(res["muhash"] != res_invalid2["muhash"])
+        assert res["muhash"] != res_invalid2["muhash"]
 
         # Add another block, so we don't depend on reconsiderblock remembering which
         # blocks were touched by invalidateblock
diff --git a/test/functional/feature_index_prune.py b/test/functional/feature_index_prune.py
index d5baa080bb..77a056346a 100755
--- a/test/functional/feature_index_prune.py
+++ b/test/functional/feature_index_prune.py
@@ -62,7 +62,7 @@ class FeatureIndexPruneTest(BitcoinTestFramework):
         for node in filter_nodes:
             assert_greater_than(len(node.getblockfilter(tip)['filter']), 0)
         for node in stats_nodes:
-            assert(node.gettxoutsetinfo(hash_type="muhash", hash_or_height=tip)['muhash'])
+            assert node.gettxoutsetinfo(hash_type="muhash", hash_or_height=tip)['muhash']
 
         self.mine_batches(500)
         self.sync_index(height=700)
@@ -80,14 +80,14 @@ class FeatureIndexPruneTest(BitcoinTestFramework):
         for node in filter_nodes:
             assert_greater_than(len(node.getblockfilter(tip)['filter']), 0)
         for node in stats_nodes:
-            assert(node.gettxoutsetinfo(hash_type="muhash", hash_or_height=tip)['muhash'])
+            assert node.gettxoutsetinfo(hash_type="muhash", hash_or_height=tip)['muhash']
 
         self.log.info("check if we can access the blockfilter and coinstats of a pruned block")
         height_hash = self.nodes[0].getblockhash(2)
         for node in filter_nodes:
             assert_greater_than(len(node.getblockfilter(height_hash)['filter']), 0)
         for node in stats_nodes:
-            assert(node.gettxoutsetinfo(hash_type="muhash", hash_or_height=height_hash)['muhash'])
+            assert node.gettxoutsetinfo(hash_type="muhash", hash_or_height=height_hash)['muhash']
 
         # mine and sync index up to a height that will later be the pruneheight
         self.generate(self.nodes[0], 51)
diff --git a/test/functional/interface_usdt_utxocache.py b/test/functional/interface_usdt_utxocache.py
index 2280de1479..e3b0b32f0d 100755
--- a/test/functional/interface_usdt_utxocache.py
+++ b/test/functional/interface_usdt_utxocache.py
@@ -357,8 +357,8 @@ class UTXOCacheTracepointTest(BitcoinTestFramework):
                 "size": event.size
             })
             # sanity checks only
-            assert(event.memory > 0)
-            assert(event.duration > 0)
+            assert event.memory > 0
+            assert event.duration > 0
             handle_flush_succeeds += 1
 
         bpf["utxocache_flush"].open_perf_buffer(handle_utxocache_flush)
diff --git a/test/functional/interface_usdt_validation.py b/test/functional/interface_usdt_validation.py
index 8953dd023b..4323aef771 100755
--- a/test/functional/interface_usdt_validation.py
+++ b/test/functional/interface_usdt_validation.py
@@ -112,7 +112,7 @@ class ValidationTracepointTest(BitcoinTestFramework):
             assert_equal(len([tx["vin"] for tx in block["tx"]]), event.inputs)
             assert_equal(0, event.sigops)  # no sigops in coinbase tx
             # only plausibility checks
-            assert(event.duration > 0)
+            assert event.duration > 0
             del expected_blocks[block_hash]
             blocks_checked += 1
 
diff --git a/test/functional/mocks/invalid_signer.py b/test/functional/mocks/invalid_signer.py
index 1d77e75215..7bfa9051ac 100755
--- a/test/functional/mocks/invalid_signer.py
+++ b/test/functional/mocks/invalid_signer.py
@@ -10,7 +10,7 @@ import json
 
 def perform_pre_checks():
     mock_result_path = os.path.join(os.getcwd(), "mock_result")
-    if(os.path.isfile(mock_result_path)):
+    if os.path.isfile(mock_result_path):
         with open(mock_result_path, "r", encoding="utf8") as f:
             mock_result = f.read()
         if mock_result[0]:
diff --git a/test/functional/mocks/signer.py b/test/functional/mocks/signer.py
index 41ea541f7b..5f4fad6380 100755
--- a/test/functional/mocks/signer.py
+++ b/test/functional/mocks/signer.py
@@ -10,7 +10,7 @@ import json
 
 def perform_pre_checks():
     mock_result_path = os.path.join(os.getcwd(), "mock_result")
-    if(os.path.isfile(mock_result_path)):
+    if os.path.isfile(mock_result_path):
         with open(mock_result_path, "r", encoding="utf8") as f:
             mock_result = f.read()
         if mock_result[0]:
diff --git a/test/functional/p2p_addr_relay.py b/test/functional/p2p_addr_relay.py
index e2e9b6dcb2..e002a520c6 100755
--- a/test/functional/p2p_addr_relay.py
+++ b/test/functional/p2p_addr_relay.py
@@ -49,7 +49,7 @@ class AddrReceiver(P2PInterface):
     def on_addr(self, message):
         for addr in message.addrs:
             self.num_ipv4_received += 1
-            if(self.test_addr_contents):
+            if self.test_addr_contents:
                 # relay_tests checks the content of the addr messages match
                 # expectations based on the message creation in setup_addr_msg
                 assert_equal(addr.nServices, 9)
diff --git a/test/functional/p2p_blocksonly.py b/test/functional/p2p_blocksonly.py
index c7297374b9..fa9ddf7ebe 100755
--- a/test/functional/p2p_blocksonly.py
+++ b/test/functional/p2p_blocksonly.py
@@ -104,7 +104,7 @@ class P2PBlocksOnly(BitcoinTestFramework):
         self.nodes[0].setmocktime(int(time.time()) + 60)
 
         conn.sync_send_with_ping()
-        assert(int(txid, 16) not in conn.get_invs())
+        assert int(txid, 16) not in conn.get_invs()
 
     def check_p2p_inv_violation(self, peer):
         self.log.info("Check that tx-invs from P2P are rejected and result in disconnect")
diff --git a/test/functional/p2p_getaddr_caching.py b/test/functional/p2p_getaddr_caching.py
index 050183f19a..1c9ad7289b 100755
--- a/test/functional/p2p_getaddr_caching.py
+++ b/test/functional/p2p_getaddr_caching.py
@@ -60,7 +60,7 @@ class AddrTest(BitcoinTestFramework):
 
         # Need to make sure we hit MAX_ADDR_TO_SEND records in the addr response later because
         # only a fraction of all known addresses can be cached and returned.
-        assert(len(self.nodes[0].getnodeaddresses(0)) > int(MAX_ADDR_TO_SEND / (MAX_PCT_ADDR_TO_SEND / 100)))
+        assert len(self.nodes[0].getnodeaddresses(0)) > int(MAX_ADDR_TO_SEND / (MAX_PCT_ADDR_TO_SEND / 100))
 
         last_response_on_local_bind = None
         last_response_on_onion_bind1 = None
@@ -85,9 +85,9 @@ class AddrTest(BitcoinTestFramework):
 
             if i > 0:
                 # Responses from different binds should be unique
-                assert(last_response_on_local_bind != addr_receiver_onion1.get_received_addrs())
-                assert(last_response_on_local_bind != addr_receiver_onion2.get_received_addrs())
-                assert(last_response_on_onion_bind1 != addr_receiver_onion2.get_received_addrs())
+                assert last_response_on_local_bind != addr_receiver_onion1.get_received_addrs()
+                assert last_response_on_local_bind != addr_receiver_onion2.get_received_addrs()
+                assert last_response_on_onion_bind1 != addr_receiver_onion2.get_received_addrs()
                 # Responses on from the same bind should be the same
                 assert_equal(last_response_on_local_bind, addr_receiver_local.get_received_addrs())
                 assert_equal(last_response_on_onion_bind1, addr_receiver_onion1.get_received_addrs())
@@ -119,9 +119,9 @@ class AddrTest(BitcoinTestFramework):
         addr_receiver_onion2.wait_until(addr_receiver_onion2.addr_received)
 
         # new response is different
-        assert(set(last_response_on_local_bind) != set(addr_receiver_local.get_received_addrs()))
-        assert(set(last_response_on_onion_bind1) != set(addr_receiver_onion1.get_received_addrs()))
-        assert(set(last_response_on_onion_bind2) != set(addr_receiver_onion2.get_received_addrs()))
+        assert set(last_response_on_local_bind) != set(addr_receiver_local.get_received_addrs())
+        assert set(last_response_on_onion_bind1) != set(addr_receiver_onion1.get_received_addrs())
+        assert set(last_response_on_onion_bind2) != set(addr_receiver_onion2.get_received_addrs())
 
 if __name__ == '__main__':
     AddrTest().main()
diff --git a/test/functional/p2p_headers_sync_with_minchainwork.py b/test/functional/p2p_headers_sync_with_minchainwork.py
index a69e7b5710..b07077c668 100755
--- a/test/functional/p2p_headers_sync_with_minchainwork.py
+++ b/test/functional/p2p_headers_sync_with_minchainwork.py
@@ -57,7 +57,7 @@ class RejectLowDifficultyHeadersTest(BitcoinTestFramework):
 
         def check_node3_chaintips(num_tips, tip_hash, height):
             node3_chaintips = self.nodes[3].getchaintips()
-            assert(len(node3_chaintips) == num_tips)
+            assert len(node3_chaintips) == num_tips
             assert {
                 'height': height,
                 'hash': tip_hash,
@@ -69,7 +69,7 @@ class RejectLowDifficultyHeadersTest(BitcoinTestFramework):
 
         for node in self.nodes[1:3]:
             chaintips = node.getchaintips()
-            assert(len(chaintips) == 1)
+            assert len(chaintips) == 1
             assert {
                 'height': 0,
                 'hash': '0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206',
@@ -89,7 +89,7 @@ class RejectLowDifficultyHeadersTest(BitcoinTestFramework):
             'status': 'active',
         } in self.nodes[2].getchaintips()
 
-        assert(len(self.nodes[2].getchaintips()) == 1)
+        assert len(self.nodes[2].getchaintips()) == 1
 
         self.log.info("Check that node3 accepted these headers as well")
         check_node3_chaintips(2, self.nodes[0].getbestblockhash(), NODE1_BLOCKS_REQUIRED)
diff --git a/test/functional/p2p_message_capture.py b/test/functional/p2p_message_capture.py
index 495e9bf1da..3ab0b79ba2 100755
--- a/test/functional/p2p_message_capture.py
+++ b/test/functional/p2p_message_capture.py
@@ -36,7 +36,7 @@ def mini_parser(dat_file):
     """
     with open(dat_file, 'rb') as f_in:
         # This should have at least one message in it
-        assert(os.fstat(f_in.fileno()).st_size >= TIME_SIZE + LENGTH_SIZE + MSGTYPE_SIZE)
+        assert os.fstat(f_in.fileno()).st_size >= TIME_SIZE + LENGTH_SIZE + MSGTYPE_SIZE
         while True:
             tmp_header_raw = f_in.read(TIME_SIZE + LENGTH_SIZE + MSGTYPE_SIZE)
             if not tmp_header_raw:
@@ -44,7 +44,7 @@ def mini_parser(dat_file):
             tmp_header = BytesIO(tmp_header_raw)
             tmp_header.read(TIME_SIZE) # skip the timestamp field
             msgtype = tmp_header.read(MSGTYPE_SIZE).rstrip(b'\x00')
-            assert(msgtype in MESSAGEMAP)
+            assert msgtype in MESSAGEMAP
             length: int = int.from_bytes(tmp_header.read(LENGTH_SIZE), "little")
             data = f_in.read(length)
             assert_equal(len(data), length)
diff --git a/test/functional/rpc_blockchain.py b/test/functional/rpc_blockchain.py
index e9c4abe2a8..19c73eebf0 100755
--- a/test/functional/rpc_blockchain.py
+++ b/test/functional/rpc_blockchain.py
@@ -370,7 +370,7 @@ class BlockchainTest(BitcoinTestFramework):
         # hash_type muhash should return a different UTXO set hash.
         res6 = node.gettxoutsetinfo(hash_type='muhash')
         assert 'muhash' in res6
-        assert(res['hash_serialized_2'] != res6['muhash'])
+        assert res['hash_serialized_2'] != res6['muhash']
 
         # muhash should not be returned unless requested.
         for r in [res, res2, res3, res4, res5]:
diff --git a/test/functional/rpc_rawtransaction.py b/test/functional/rpc_rawtransaction.py
index c0a0e7ee17..1c91ab6f5f 100755
--- a/test/functional/rpc_rawtransaction.py
+++ b/test/functional/rpc_rawtransaction.py
@@ -216,13 +216,13 @@ class RawTransactionsTest(BitcoinTestFramework):
             if missing_fields:
                 raise AssertionError(f"fields {', '.join(missing_fields)} are not in transaction")
 
-            assert(len(gottx['vin']) > 0)
+            assert len(gottx['vin']) > 0
             if v == 1:
-                assert('fee' not in gottx)
-                assert('prevout' not in gottx['vin'][0])
+                assert 'fee' not in gottx
+                assert 'prevout' not in gottx['vin'][0]
             if v == 2:
-                assert(isinstance(gottx['fee'], Decimal))
-                assert('prevout' in gottx['vin'][0])
+                assert isinstance(gottx['fee'], Decimal)
+                assert 'prevout' in gottx['vin'][0]
                 prevout = gottx['vin'][0]['prevout']
                 script_pub_key = prevout['scriptPubKey']
 
@@ -235,11 +235,11 @@ class RawTransactionsTest(BitcoinTestFramework):
                     raise AssertionError(f"fields {', '.join(missing_fields)} are not in transaction")
 
         # check verbosity 2 without blockhash but with txindex
-        assert('fee' in self.nodes[0].getrawtransaction(txid=tx, verbosity=2))
+        assert 'fee' in self.nodes[0].getrawtransaction(txid=tx, verbosity=2)
         # check that coinbase has no fee or does not throw any errors for verbosity 2
         coin_base = self.nodes[1].getblock(block1)['tx'][0]
         gottx = self.nodes[1].getrawtransaction(txid=coin_base, verbosity=2, blockhash=block1)
-        assert('fee' not in gottx)
+        assert 'fee' not in gottx
 
     def createrawtransaction_tests(self):
         self.log.info("Test createrawtransaction")
diff --git a/test/functional/rpc_scanblocks.py b/test/functional/rpc_scanblocks.py
index b449875c95..9a00518150 100755
--- a/test/functional/rpc_scanblocks.py
+++ b/test/functional/rpc_scanblocks.py
@@ -46,7 +46,7 @@ class ScanblocksTest(BitcoinTestFramework):
         self.wait_until(lambda: all(i["synced"] for i in node.getindexinfo().values()))
 
         out = node.scanblocks("start", [f"addr({addr_1})"])
-        assert(blockhash in out['relevant_blocks'])
+        assert blockhash in out['relevant_blocks']
         assert_equal(height, out['to_height'])
         assert_equal(0, out['from_height'])
 
@@ -56,24 +56,24 @@ class ScanblocksTest(BitcoinTestFramework):
 
         # make sure the blockhash is not in the filter result if we set the start_height
         # to the just mined block (unlikely to hit a false positive)
-        assert(blockhash not in node.scanblocks(
-            "start", [f"addr({addr_1})"], height_new)['relevant_blocks'])
+        assert blockhash not in node.scanblocks(
+            "start", [f"addr({addr_1})"], height_new)['relevant_blocks']
 
         # make sure the blockhash is present when using the first mined block as start_height
-        assert(blockhash in node.scanblocks(
-            "start", [f"addr({addr_1})"], height)['relevant_blocks'])
+        assert blockhash in node.scanblocks(
+            "start", [f"addr({addr_1})"], height)['relevant_blocks']
 
         # also test the stop height
-        assert(blockhash in node.scanblocks(
-            "start", [f"addr({addr_1})"], height, height)['relevant_blocks'])
+        assert blockhash in node.scanblocks(
+            "start", [f"addr({addr_1})"], height, height)['relevant_blocks']
 
         # use the stop_height to exclude the relevant block
-        assert(blockhash not in node.scanblocks(
-            "start", [f"addr({addr_1})"], 0, height - 1)['relevant_blocks'])
+        assert blockhash not in node.scanblocks(
+            "start", [f"addr({addr_1})"], 0, height - 1)['relevant_blocks']
 
         # make sure the blockhash is present when using the first mined block as start_height
-        assert(blockhash in node.scanblocks(
-            "start", [{"desc": f"pkh({parent_key}/*)", "range": [0, 100]}], height)['relevant_blocks'])
+        assert blockhash in node.scanblocks(
+            "start", [{"desc": f"pkh({parent_key}/*)", "range": [0, 100]}], height)['relevant_blocks']
 
         # check that false-positives are included in the result now; note that
         # finding a false-positive at runtime would take too long, hence we simply
@@ -89,10 +89,10 @@ class ScanblocksTest(BitcoinTestFramework):
         false_positive_hash = bip158_basic_element_hash(false_positive_spk, 1, genesis_blockhash)
         assert_equal(genesis_coinbase_hash, false_positive_hash)
 
-        assert(genesis_blockhash in node.scanblocks(
-            "start", [{"desc": f"raw({genesis_coinbase_spk.hex()})"}], 0, 0)['relevant_blocks'])
-        assert(genesis_blockhash in node.scanblocks(
-            "start", [{"desc": f"raw({false_positive_spk.hex()})"}], 0, 0)['relevant_blocks'])
+        assert genesis_blockhash in node.scanblocks(
+            "start", [{"desc": f"raw({genesis_coinbase_spk.hex()})"}], 0, 0)['relevant_blocks']
+        assert genesis_blockhash in node.scanblocks(
+            "start", [{"desc": f"raw({false_positive_spk.hex()})"}], 0, 0)['relevant_blocks']
 
         # TODO: after an "accurate" mode for scanblocks is implemented (e.g. PR #26325)
         # check here that it filters out the false-positive
diff --git a/test/functional/test_framework/key.py b/test/functional/test_framework/key.py
index 68afc1383d..ad305ce1ef 100644
--- a/test/functional/test_framework/key.py
+++ b/test/functional/test_framework/key.py
@@ -139,7 +139,7 @@ class EllipticCurve:
         See https://en.wikibooks.org/wiki/Cryptography/Prime_Curve/Jacobian_Coordinates - Point Addition (with affine point)"""
         x1, y1, z1 = p1
         x2, y2, z2 = p2
-        assert(z2 == 1)
+        assert z2 == 1
         # Adding to the point at infinity is a no-op
         if z1 == 0:
             return p2
@@ -262,7 +262,7 @@ class ECPubKey():
         return self.valid
 
     def get_bytes(self):
-        assert(self.valid)
+        assert self.valid
         p = SECP256K1.affine(self.p)
         if p is None:
             return None
@@ -276,7 +276,7 @@ class ECPubKey():
 
         See https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm for the
         ECDSA verifier algorithm"""
-        assert(self.valid)
+        assert self.valid
 
         # Extract r and s from the DER formatted signature. Return false for
         # any DER encoding errors.
@@ -349,7 +349,7 @@ class ECKey():
 
     def set(self, secret, compressed):
         """Construct a private key object with given 32-byte secret and compressed flag."""
-        assert(len(secret) == 32)
+        assert len(secret) == 32
         secret = int.from_bytes(secret, 'big')
         self.valid = (secret > 0 and secret < SECP256K1_ORDER)
         if self.valid:
@@ -362,7 +362,7 @@ class ECKey():
 
     def get_bytes(self):
         """Retrieve the 32-byte representation of this key."""
-        assert(self.valid)
+        assert self.valid
         return self.secret.to_bytes(32, 'big')
 
     @property
@@ -375,7 +375,7 @@ class ECKey():
 
     def get_pubkey(self):
         """Compute an ECPubKey object for this secret key."""
-        assert(self.valid)
+        assert self.valid
         ret = ECPubKey()
         p = SECP256K1.mul([(SECP256K1_G, self.secret)])
         ret.p = p
@@ -388,7 +388,7 @@ class ECKey():
 
         See https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm for the
         ECDSA signer algorithm."""
-        assert(self.valid)
+        assert self.valid
         z = int.from_bytes(msg, 'big')
         # Note: no RFC6979 by default, but a simple random nonce (some tests rely on distinct transactions for the same operation)
         if rfc6979:
diff --git a/test/functional/test_framework/script.py b/test/functional/test_framework/script.py
index ebff849cc9..f345bf02db 100644
--- a/test/functional/test_framework/script.py
+++ b/test/functional/test_framework/script.py
@@ -824,10 +824,10 @@ def taproot_tree_helper(scripts):
     if len(scripts) == 1:
         # One entry: treat as a leaf
         script = scripts[0]
-        assert(not callable(script))
+        assert not callable(script)
         if isinstance(script, list):
             return taproot_tree_helper(script)
-        assert(isinstance(script, tuple))
+        assert isinstance(script, tuple)
         version = LEAF_VERSION_TAPSCRIPT
         name = script[0]
         code = script[1]
diff --git a/test/functional/test_framework/siphash.py b/test/functional/test_framework/siphash.py
index 5ad245cf1b..884dbcab46 100644
--- a/test/functional/test_framework/siphash.py
+++ b/test/functional/test_framework/siphash.py
@@ -31,7 +31,7 @@ def siphash_round(v0, v1, v2, v3):
 
 
 def siphash(k0, k1, data):
-    assert(type(data) == bytes)
+    assert type(data) == bytes
     v0 = 0x736f6d6570736575 ^ k0
     v1 = 0x646f72616e646f6d ^ k1
     v2 = 0x6c7967656e657261 ^ k0
@@ -61,5 +61,5 @@ def siphash(k0, k1, data):
 
 
 def siphash256(k0, k1, num):
-    assert(type(num) == int)
+    assert type(num) == int
     return siphash(k0, k1, num.to_bytes(32, 'little'))
diff --git a/test/functional/wallet_avoidreuse.py b/test/functional/wallet_avoidreuse.py
index 4fb0559a33..5601d81227 100755
--- a/test/functional/wallet_avoidreuse.py
+++ b/test/functional/wallet_avoidreuse.py
@@ -195,7 +195,7 @@ class AvoidReuseTest(BitcoinTestFramework):
         # getbalances should show no used, 10 btc trusted
         assert_balances(self.nodes[1], mine={"used": 0, "trusted": 10})
         # node 0 should not show a used entry, as it does not enable avoid_reuse
-        assert("used" not in self.nodes[0].getbalances()["mine"])
+        assert "used" not in self.nodes[0].getbalances()["mine"]
 
         self.nodes[1].sendtoaddress(retaddr, 5)
         self.generate(self.nodes[0], 1)
diff --git a/test/functional/wallet_backwards_compatibility.py b/test/functional/wallet_backwards_compatibility.py
index ffe3c359a9..f55a3758ce 100755
--- a/test/functional/wallet_backwards_compatibility.py
+++ b/test/functional/wallet_backwards_compatibility.py
@@ -193,18 +193,18 @@ class BackwardsCompatibilityTest(BitcoinTestFramework):
                         assert_equal(txs[1]["txid"], tx1_id)
                         assert_equal(txs[2]["walletconflicts"], [tx1_id])
                         assert_equal(txs[1]["replaced_by_txid"], tx2_id)
-                        assert not(txs[1]["abandoned"])
+                        assert not txs[1]["abandoned"]
                         assert_equal(txs[1]["confirmations"], -1)
                         assert_equal(txs[2]["blockindex"], 1)
                         assert txs[3]["abandoned"]
                         assert_equal(txs[4]["walletconflicts"], [tx3_id])
                         assert_equal(txs[3]["replaced_by_txid"], tx4_id)
-                        assert not(hasattr(txs[3], "blockindex"))
+                        assert not hasattr(txs[3], "blockindex")
                     elif wallet_name == "w2":
-                        assert(info['private_keys_enabled'] == False)
+                        assert info['private_keys_enabled'] == False
                         assert info['keypoolsize'] == 0
                     else:
-                        assert(info['private_keys_enabled'] == True)
+                        assert info['private_keys_enabled'] == True
                         assert info['keypoolsize'] == 0
         else:
             for node in legacy_nodes:
diff --git a/test/functional/wallet_bumpfee.py b/test/functional/wallet_bumpfee.py
index 2160408a55..1cb3f434e8 100755
--- a/test/functional/wallet_bumpfee.py
+++ b/test/functional/wallet_bumpfee.py
@@ -557,7 +557,7 @@ def test_unconfirmed_not_spendable(self, rbf_node, rbf_node_address):
 
 def test_bumpfee_metadata(self, rbf_node, dest_address):
     self.log.info('Test that bumped txn metadata persists to new txn record')
-    assert(rbf_node.getbalance() < 49)
+    assert rbf_node.getbalance() < 49
     self.generatetoaddress(rbf_node, 101, rbf_node.getnewaddress())
     rbfid = rbf_node.sendtoaddress(dest_address, 49, "comment value", "to value")
     bumped_tx = rbf_node.bumpfee(rbfid)
diff --git a/test/functional/wallet_implicitsegwit.py b/test/functional/wallet_implicitsegwit.py
index 3ac0bbc17f..baa9bafb00 100755
--- a/test/functional/wallet_implicitsegwit.py
+++ b/test/functional/wallet_implicitsegwit.py
@@ -36,7 +36,7 @@ def check_implicit_transactions(implicit_keys, implicit_node):
         pubkey = implicit_keys[a]
         for b in address_types:
             b_address = key_to_address(pubkey, b)
-            assert(('receive', b_address) in tuple((tx['category'], tx['address']) for tx in txs))
+            assert ('receive', b_address) in tuple((tx['category'], tx['address']) for tx in txs)
 
 class ImplicitSegwitTest(BitcoinTestFramework):
     def add_options(self, parser):
diff --git a/test/functional/wallet_importdescriptors.py b/test/functional/wallet_importdescriptors.py
index 03b285e254..9e813166c5 100755
--- a/test/functional/wallet_importdescriptors.py
+++ b/test/functional/wallet_importdescriptors.py
@@ -487,8 +487,8 @@ class ImportDescriptorsTest(BitcoinTestFramework):
         assert_equal(addr, 'bcrt1qp8s25ckjl7gr6x2q3dx3tn2pytwp05upkjztk6ey857tt50r5aeqn6mvr9') # Derived at m/84'/0'/0'/1
         change_addr = wmulti_pub.getrawchangeaddress('bech32')
         assert_equal(change_addr, 'bcrt1qzxl0qz2t88kljdnkzg4n4gapr6kte26390gttrg79x66nt4p04fssj53nl')
-        assert(send_txid in self.nodes[0].getrawmempool(True))
-        assert(send_txid in (x['txid'] for x in wmulti_pub.listunspent(0)))
+        assert send_txid in self.nodes[0].getrawmempool(True)
+        assert send_txid in (x['txid'] for x in wmulti_pub.listunspent(0))
         assert_equal(wmulti_pub.getwalletinfo()['keypoolsize'], 999)
 
         # generate some utxos for next tests
diff --git a/test/functional/wallet_reorgsrestore.py b/test/functional/wallet_reorgsrestore.py
index 2969da4059..1c79c6816c 100755
--- a/test/functional/wallet_reorgsrestore.py
+++ b/test/functional/wallet_reorgsrestore.py
@@ -94,11 +94,11 @@ class ReorgsRestoreTest(BitcoinTestFramework):
         tx_after_reorg = self.nodes[1].gettransaction(txid)
         # Check that normal confirmed tx is confirmed again but with different blockhash
         assert_equal(tx_after_reorg["confirmations"], 2)
-        assert(tx_before_reorg["blockhash"] != tx_after_reorg["blockhash"])
+        assert tx_before_reorg["blockhash"] != tx_after_reorg["blockhash"]
         conflicted_after_reorg = self.nodes[1].gettransaction(conflicted_txid)
         # Check that conflicted tx is confirmed again with blockhash different than previously conflicting tx
         assert_equal(conflicted_after_reorg["confirmations"], 1)
-        assert(conflicting["blockhash"] != conflicted_after_reorg["blockhash"])
+        assert conflicting["blockhash"] != conflicted_after_reorg["blockhash"]
 
 if __name__ == '__main__':
     ReorgsRestoreTest().main()
diff --git a/test/functional/wallet_send.py b/test/functional/wallet_send.py
index 7c83b42769..a71326dcbf 100755
--- a/test/functional/wallet_send.py
+++ b/test/functional/wallet_send.py
@@ -279,11 +279,11 @@ class WalletSendTest(BitcoinTestFramework):
 
         self.log.info("Don't broadcast...")
         res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, add_to_wallet=False)
-        assert(res["hex"])
+        assert res["hex"]
 
         self.log.info("Return PSBT...")
         res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, psbt=True)
-        assert(res["psbt"])
+        assert res["psbt"]
 
         self.log.info("Create transaction that spends to address, but don't broadcast...")
         self.test_send(from_wallet=w0, to_wallet=w1, amount=1, add_to_wallet=False)
diff --git a/test/functional/wallet_signer.py b/test/functional/wallet_signer.py
index 01cd4f28fc..8d25044e43 100755
--- a/test/functional/wallet_signer.py
+++ b/test/functional/wallet_signer.py
@@ -174,7 +174,7 @@ class WalletSignerTest(BitcoinTestFramework):
         mock_psbt_signed = mock_wallet.walletprocesspsbt(psbt=mock_psbt, sign=True, sighashtype="ALL", bip32derivs=True)
         mock_psbt_final = mock_wallet.finalizepsbt(mock_psbt_signed["psbt"])
         mock_tx = mock_psbt_final["hex"]
-        assert(mock_wallet.testmempoolaccept([mock_tx])[0]["allowed"])
+        assert mock_wallet.testmempoolaccept([mock_tx])[0]["allowed"]
 
         # # Create a new wallet and populate with specific public keys, in order
         # # to work with the mock signed PSBT.
@@ -203,7 +203,7 @@ class WalletSignerTest(BitcoinTestFramework):
         # assert_equal(result[1], {'success': True})
         assert_equal(hww.getwalletinfo()["txcount"], 1)
 
-        assert(hww.testmempoolaccept([mock_tx])[0]["allowed"])
+        assert hww.testmempoolaccept([mock_tx])[0]["allowed"]
 
         with open(os.path.join(self.nodes[1].cwd, "mock_psbt"), "w", encoding="utf8") as f:
             f.write(mock_psbt_signed["psbt"])
@@ -212,13 +212,13 @@ class WalletSignerTest(BitcoinTestFramework):
 
         # Don't broadcast transaction yet so the RPC returns the raw hex
         res = hww.send(outputs={dest:0.5},options={"add_to_wallet": False})
-        assert(res["complete"])
+        assert res["complete"]
         assert_equal(res["hex"], mock_tx)
 
         self.log.info('Test sendall using hww1')
 
         res = hww.sendall(recipients=[{dest:0.5}, hww.getrawchangeaddress()],options={"add_to_wallet": False})
-        assert(res["complete"])
+        assert res["complete"]
         assert_equal(res["hex"], mock_tx)
         # Broadcast transaction so we can bump the fee
         hww.sendrawtransaction(res["hex"])
diff --git a/test/functional/wallet_taproot.py b/test/functional/wallet_taproot.py
index d95ad9e01f..b52892704f 100755
--- a/test/functional/wallet_taproot.py
+++ b/test/functional/wallet_taproot.py
@@ -244,7 +244,7 @@ class WalletTaprootTest(BitcoinTestFramework):
         desc_pub = self.make_desc(pattern, privmap, keys, True)
         assert_equal(self.nodes[0].getdescriptorinfo(desc)['descriptor'], desc_pub)
         result = addr_gen.importdescriptors([{"desc": desc_pub, "active": True, "timestamp": "now"}])
-        assert(result[0]['success'])
+        assert result[0]['success']
         address_type = "bech32m" if "tr" in pattern else "bech32"
         for i in range(4):
             addr_g = addr_gen.getnewaddress(address_type=address_type)
@@ -260,9 +260,9 @@ class WalletTaprootTest(BitcoinTestFramework):
 
         # tr descriptors can be imported
         result = privs_tr_enabled.importdescriptors([{"desc": desc, "timestamp": "now"}])
-        assert(result[0]["success"])
+        assert result[0]['success']
         result = pubs_tr_enabled.importdescriptors([{"desc": desc_pub, "timestamp": "now"}])
-        assert(result[0]["success"])
+        assert result[0]["success"]
 
         # Cleanup
         privs_tr_enabled.unloadwallet()
@@ -284,9 +284,9 @@ class WalletTaprootTest(BitcoinTestFramework):
         assert_equal(self.nodes[0].getdescriptorinfo(desc_pay)['descriptor'], desc_pay_pub)
         assert_equal(self.nodes[0].getdescriptorinfo(desc_change)['descriptor'], desc_change_pub)
         result = rpc_online.importdescriptors([{"desc": desc_pay, "active": True, "timestamp": "now"}])
-        assert(result[0]['success'])
+        assert result[0]['success']
         result = rpc_online.importdescriptors([{"desc": desc_change, "active": True, "timestamp": "now", "internal": True}])
-        assert(result[0]['success'])
+        assert result[0]['success']
         address_type = "bech32m" if "tr" in pattern else "bech32"
         for i in range(4):
             addr_g = rpc_online.getnewaddress(address_type=address_type)
@@ -302,12 +302,12 @@ class WalletTaprootTest(BitcoinTestFramework):
             # Increase fee_rate to compensate for the wallet's inability to estimate fees for script path spends.
             res = rpc_online.sendtoaddress(address=self.boring.getnewaddress(), amount=Decimal(ret_amnt) / 100000000, subtractfeefromamount=True, fee_rate=200)
             self.generatetoaddress(self.nodes[0], 1, self.boring.getnewaddress(), sync_fun=self.no_op)
-            assert(rpc_online.gettransaction(res)["confirmations"] > 0)
+            assert rpc_online.gettransaction(res)["confirmations"] > 0
 
         # Cleanup
         txid = rpc_online.sendall(recipients=[self.boring.getnewaddress()])["txid"]
         self.generatetoaddress(self.nodes[0], 1, self.boring.getnewaddress(), sync_fun=self.no_op)
-        assert(rpc_online.gettransaction(txid)["confirmations"] > 0)
+        assert rpc_online.gettransaction(txid)["confirmations"] > 0
         rpc_online.unloadwallet()
 
     def do_test_psbt(self, comment, pattern, privmap, treefn, keys_pay, keys_change):
@@ -329,16 +329,16 @@ class WalletTaprootTest(BitcoinTestFramework):
         assert_equal(self.nodes[0].getdescriptorinfo(desc_pay)['descriptor'], desc_pay_pub)
         assert_equal(self.nodes[0].getdescriptorinfo(desc_change)['descriptor'], desc_change_pub)
         result = psbt_online.importdescriptors([{"desc": desc_pay_pub, "active": True, "timestamp": "now"}])
-        assert(result[0]['success'])
+        assert result[0]['success']
         result = psbt_online.importdescriptors([{"desc": desc_change_pub, "active": True, "timestamp": "now", "internal": True}])
-        assert(result[0]['success'])
+        assert result[0]['success']
         result = psbt_offline.importdescriptors([{"desc": desc_pay, "active": True, "timestamp": "now"}])
-        assert(result[0]['success'])
+        assert result[0]['success']
         result = psbt_offline.importdescriptors([{"desc": desc_change, "active": True, "timestamp": "now", "internal": True}])
-        assert(result[0]['success'])
+        assert result[0]['success']
         for key in keys_pay + keys_change:
             result = key_only_wallet.importdescriptors([{"desc": descsum_create(f"wpkh({key['xprv']}/*)"), "timestamp":"now"}])
-            assert(result[0]["success"])
+            assert result[0]["success"]
         address_type = "bech32m" if "tr" in pattern else "bech32"
         for i in range(4):
             addr_g = psbt_online.getnewaddress(address_type=address_type)
@@ -375,7 +375,7 @@ class WalletTaprootTest(BitcoinTestFramework):
 
             txid = self.nodes[0].sendrawtransaction(rawtx)
             self.generatetoaddress(self.nodes[0], 1, self.boring.getnewaddress(), sync_fun=self.no_op)
-            assert(psbt_online.gettransaction(txid)['confirmations'] > 0)
+            assert psbt_online.gettransaction(txid)['confirmations'] > 0
 
         # Cleanup
         psbt = psbt_online.sendall(recipients=[self.boring.getnewaddress()], options={"psbt": True})["psbt"]
@@ -383,7 +383,7 @@ class WalletTaprootTest(BitcoinTestFramework):
         rawtx = self.nodes[0].finalizepsbt(res['psbt'])['hex']
         txid = self.nodes[0].sendrawtransaction(rawtx)
         self.generatetoaddress(self.nodes[0], 1, self.boring.getnewaddress(), sync_fun=self.no_op)
-        assert(psbt_online.gettransaction(txid)['confirmations'] > 0)
+        assert psbt_online.gettransaction(txid)['confirmations'] > 0
         psbt_online.unloadwallet()
         psbt_offline.unloadwallet()