Merge #10781: Python cleanups

78214588d Use for-loop instead of list comprehension (practicalswift)
823979436 Use the variable name _ for unused return values (practicalswift)
2e6080bbf Remove unused variables and/or function calls (practicalswift)
9b94054b7 Avoid reference to undefined name: stderr does not exist, sys.stderr does (practicalswift)
51cb6b822 Use print(...) instead of undefined printf(...) (practicalswift)
25cd520fc Use sys.exit(...) instead of exit(...): exit(...) should not be used in programs (practicalswift)

Pull request description:

  Python cleanups:
  * Avoid reference to undefined name: `stderr` does not exist, `sys.stderr` does
  * Use `print(...)` instead of undefined `printf(...)`
  * Avoid redefinition of variable (`tx`) in list comprehension
  * Remove unused variables and/or function calls
  * Use `sys.exit(...)` instead of `exit(...)`: [`exit(...)` should not be used in programs](https://github.com/bitcoin/bitcoin/pull/10753#discussion_r125935027)

Tree-SHA512: 1238dfbc1d20f7edadea5e5406a589f293065638f6234809f0d5b6ba746dffe3d276bc5884c7af388a6c798c61a8759faaccf57f381225644754c0f61914eb4b

33 files changed, 70 insertions, 398 deletions

diff --git a/contrib/devtools/check-doc.py b/contrib/devtools/check-doc.py
index 3b7a8f9a61..3279dc3612 100755
--- a/contrib/devtools/check-doc.py
+++ b/contrib/devtools/check-doc.py
@@ -12,6 +12,7 @@ Author: @MarcoFalke
 
 from subprocess import check_output
 import re
+import sys
 
 FOLDER_GREP = 'src'
 FOLDER_TEST = 'src/test/'
@@ -39,7 +40,7 @@ def main():
   print "Args unknown     : %s" % len(args_unknown)
   print args_unknown
 
-  exit(len(args_need_doc))
+  sys.exit(len(args_need_doc))
 
 if __name__ == "__main__":
     main()
diff --git a/contrib/devtools/github-merge.py b/contrib/devtools/github-merge.py
index c664cf81fa..4b1bae6100 100755
--- a/contrib/devtools/github-merge.py
+++ b/contrib/devtools/github-merge.py
@@ -20,6 +20,7 @@ from sys import stdin,stdout,stderr
 import argparse
 import hashlib
 import subprocess
+import sys
 import json,codecs
 try:
     from urllib.request import Request,urlopen
@@ -158,11 +159,11 @@ def main():
     if repo is None:
         print("ERROR: No repository configured. Use this command to set:", file=stderr)
         print("git config githubmerge.repository <owner>/<repo>", file=stderr)
-        exit(1)
+        sys.exit(1)
     if signingkey is None:
         print("ERROR: No GPG signing key set. Set one using:",file=stderr)
         print("git config --global user.signingkey <key>",file=stderr)
-        exit(1)
+        sys.exit(1)
 
     host_repo = host+":"+repo # shortcut for push/pull target
 
@@ -173,7 +174,7 @@ def main():
     # Receive pull information from github
     info = retrieve_pr_info(repo,pull)
     if info is None:
-        exit(1)
+        sys.exit(1)
     title = info['title'].strip()
     body = info['body'].strip()
     # precedence order for destination branch argument:
@@ -194,27 +195,27 @@ def main():
         subprocess.check_call([GIT,'checkout','-q',branch])
     except subprocess.CalledProcessError as e:
         print("ERROR: Cannot check out branch %s." % (branch), file=stderr)
-        exit(3)
+        sys.exit(3)
     try:
         subprocess.check_call([GIT,'fetch','-q',host_repo,'+refs/pull/'+pull+'/*:refs/heads/pull/'+pull+'/*'])
     except subprocess.CalledProcessError as e:
         print("ERROR: Cannot find pull request #%s on %s." % (pull,host_repo), file=stderr)
-        exit(3)
+        sys.exit(3)
     try:
         subprocess.check_call([GIT,'log','-q','-1','refs/heads/'+head_branch], stdout=devnull, stderr=stdout)
     except subprocess.CalledProcessError as e:
         print("ERROR: Cannot find head of pull request #%s on %s." % (pull,host_repo), file=stderr)
-        exit(3)
+        sys.exit(3)
     try:
         subprocess.check_call([GIT,'log','-q','-1','refs/heads/'+merge_branch], stdout=devnull, stderr=stdout)
     except subprocess.CalledProcessError as e:
         print("ERROR: Cannot find merge of pull request #%s on %s." % (pull,host_repo), file=stderr)
-        exit(3)
+        sys.exit(3)
     try:
         subprocess.check_call([GIT,'fetch','-q',host_repo,'+refs/heads/'+branch+':refs/heads/'+base_branch])
     except subprocess.CalledProcessError as e:
         print("ERROR: Cannot find branch %s on %s." % (branch,host_repo), file=stderr)
-        exit(3)
+        sys.exit(3)
     subprocess.check_call([GIT,'checkout','-q',base_branch])
     subprocess.call([GIT,'branch','-q','-D',local_merge_branch], stderr=devnull)
     subprocess.check_call([GIT,'checkout','-q','-b',local_merge_branch])
@@ -236,30 +237,30 @@ def main():
         except subprocess.CalledProcessError as e:
             print("ERROR: Cannot be merged cleanly.",file=stderr)
             subprocess.check_call([GIT,'merge','--abort'])
-            exit(4)
+            sys.exit(4)
         logmsg = subprocess.check_output([GIT,'log','--pretty=format:%s','-n','1']).decode('utf-8')
         if logmsg.rstrip() != firstline.rstrip():
             print("ERROR: Creating merge failed (already merged?).",file=stderr)
-            exit(4)
+            sys.exit(4)
 
         symlink_files = get_symlink_files()
         for f in symlink_files:
             print("ERROR: File %s was a symlink" % f)
         if len(symlink_files) > 0:
-            exit(4)
+            sys.exit(4)
 
         # Put tree SHA512 into the message
         try:
             first_sha512 = tree_sha512sum()
             message += '\n\nTree-SHA512: ' + first_sha512
         except subprocess.CalledProcessError as e:
-            printf("ERROR: Unable to compute tree hash")
-            exit(4)
+            print("ERROR: Unable to compute tree hash")
+            sys.exit(4)
         try:
             subprocess.check_call([GIT,'commit','--amend','-m',message.encode('utf-8')])
         except subprocess.CalledProcessError as e:
-            printf("ERROR: Cannot update message.",file=stderr)
-            exit(4)
+            print("ERROR: Cannot update message.", file=stderr)
+            sys.exit(4)
 
         print_merge_details(pull, title, branch, base_branch, head_branch)
         print()
@@ -268,7 +269,7 @@ def main():
         if testcmd:
             if subprocess.call(testcmd,shell=True):
                 print("ERROR: Running %s failed." % testcmd,file=stderr)
-                exit(5)
+                sys.exit(5)
 
             # Show the created merge.
             diff = subprocess.check_output([GIT,'diff',merge_branch+'..'+local_merge_branch])
@@ -279,7 +280,7 @@ def main():
                 if reply.lower() == 'ignore':
                     print("Difference with github ignored.",file=stderr)
                 else:
-                    exit(6)
+                    sys.exit(6)
         else:
             # Verify the result manually.
             print("Dropping you on a shell so you can try building/testing the merged source.",file=stderr)
@@ -292,7 +293,7 @@ def main():
         second_sha512 = tree_sha512sum()
         if first_sha512 != second_sha512:
             print("ERROR: Tree hash changed unexpectedly",file=stderr)
-            exit(8)
+            sys.exit(8)
 
         # Sign the merge commit.
         print_merge_details(pull, title, branch, base_branch, head_branch)
@@ -306,7 +307,7 @@ def main():
                     print("Error while signing, asking again.",file=stderr)
             elif reply == 'x':
                 print("Not signing off on merge, exiting.",file=stderr)
-                exit(1)
+                sys.exit(1)
 
         # Put the result in branch.
         subprocess.check_call([GIT,'checkout','-q',branch])
@@ -326,7 +327,7 @@ def main():
             subprocess.check_call([GIT,'push',host_repo,'refs/heads/'+branch])
             break
         elif reply == 'x':
-            exit(1)
+            sys.exit(1)
 
 if __name__ == '__main__':
     main()
diff --git a/contrib/devtools/security-check.py b/contrib/devtools/security-check.py
index c90541e271..6eb5667453 100755
--- a/contrib/devtools/security-check.py
+++ b/contrib/devtools/security-check.py
@@ -212,5 +212,5 @@ if __name__ == '__main__':
         except IOError:
             print('%s: cannot open' % filename)
             retval = 1
-    exit(retval)
+    sys.exit(retval)
 
diff --git a/contrib/devtools/symbol-check.py b/contrib/devtools/symbol-check.py
index 8f8685006e..98daa1bd76 100755
--- a/contrib/devtools/symbol-check.py
+++ b/contrib/devtools/symbol-check.py
@@ -159,6 +159,6 @@ if __name__ == '__main__':
                 print('%s: NEEDED library %s is not allowed' % (filename, library_name.decode('utf-8')))
                 retval = 1
 
-    exit(retval)
+    sys.exit(retval)
 
 
diff --git a/contrib/devtools/update-translations.py b/contrib/devtools/update-translations.py
index 2011841005..e1924749d2 100755
--- a/contrib/devtools/update-translations.py
+++ b/contrib/devtools/update-translations.py
@@ -36,12 +36,12 @@ def check_at_repository_root():
     if not os.path.exists('.git'):
         print('No .git directory found')
         print('Execute this script at the root of the repository', file=sys.stderr)
-        exit(1)
+        sys.exit(1)
 
 def fetch_all_translations():
     if subprocess.call([TX, 'pull', '-f', '-a']):
         print('Error while fetching translations', file=sys.stderr)
-        exit(1)
+        sys.exit(1)
 
 def find_format_specifiers(s):
     '''Find all format specifiers in a string.'''
diff --git a/contrib/linearize/linearize-hashes.py b/contrib/linearize/linearize-hashes.py
index db8eb7021e..58fec6dddc 100755
--- a/contrib/linearize/linearize-hashes.py
+++ b/contrib/linearize/linearize-hashes.py
@@ -87,7 +87,7 @@ def get_block_hashes(settings, max_blocks_per_call=10000):
 		for x,resp_obj in enumerate(reply):
 			if rpc.response_is_error(resp_obj):
 				print('JSON-RPC: error at height', height+x, ': ', resp_obj['error'], file=sys.stderr)
-				exit(1)
+				sys.exit(1)
 			assert(resp_obj['id'] == x) # assume replies are in-sequence
 			if settings['rev_hash_bytes'] == 'true':
 				resp_obj['result'] = hex_switchEndian(resp_obj['result'])
@@ -140,7 +140,7 @@ if __name__ == '__main__':
 	if 'datadir' in settings and not use_userpass:
 		use_datadir = True
 	if not use_userpass and not use_datadir:
-		print("Missing datadir or username and/or password in cfg file", file=stderr)
+		print("Missing datadir or username and/or password in cfg file", file=sys.stderr)
 		sys.exit(1)
 
 	settings['port'] = int(settings['port'])
diff --git a/contrib/seeds/generate-seeds.py b/contrib/seeds/generate-seeds.py
index b0ac92ae03..28068a7523 100755
--- a/contrib/seeds/generate-seeds.py
+++ b/contrib/seeds/generate-seeds.py
@@ -114,7 +114,7 @@ def process_nodes(g, f, structname, defaultport):
 def main():
     if len(sys.argv)<2:
         print(('Usage: %s <path_to_nodes_txt>' % sys.argv[0]), file=sys.stderr)
-        exit(1)
+        sys.exit(1)
     g = sys.stdout
     indir = sys.argv[1]
     g.write('#ifndef BITCOIN_CHAINPARAMSSEEDS_H\n')
diff --git a/contrib/zmq/zmq_sub.py b/contrib/zmq/zmq_sub.py
index ea398a27ea..5cc19761d4 100755
--- a/contrib/zmq/zmq_sub.py
+++ b/contrib/zmq/zmq_sub.py
@@ -32,7 +32,7 @@ import sys
 
 if not (sys.version_info.major >= 3 and sys.version_info.minor >= 5):
     print("This example only works with Python 3.5 and greater")
-    exit(1)
+    sys.exit(1)
 
 port = 28332
 
diff --git a/contrib/zmq/zmq_sub3.4.py b/contrib/zmq/zmq_sub3.4.py
index 1cb7eec0c0..bfb7ea9eae 100755
--- a/contrib/zmq/zmq_sub3.4.py
+++ b/contrib/zmq/zmq_sub3.4.py
@@ -36,7 +36,7 @@ import sys
 
 if not (sys.version_info.major >= 3 and sys.version_info.minor >= 4):
     print("This example only works with Python 3.4 and greater")
-    exit(1)
+    sys.exit(1)
 
 port = 28332
 
diff --git a/share/qt/extract_strings_qt.py b/share/qt/extract_strings_qt.py
index 5492fdb8c5..e3be18205d 100755
--- a/share/qt/extract_strings_qt.py
+++ b/share/qt/extract_strings_qt.py
@@ -58,7 +58,7 @@ XGETTEXT=os.getenv('XGETTEXT', 'xgettext')
 if not XGETTEXT:
     print('Cannot extract strings: xgettext utility is not installed or not configured.',file=sys.stderr)
     print('Please install package "gettext" and re-run \'./configure\'.',file=sys.stderr)
-    exit(1)
+    sys.exit(1)
 child = Popen([XGETTEXT,'--output=-','-n','--keyword=_'] + files, stdout=PIPE)
 (out, err) = child.communicate()
 
diff --git a/test/functional/bip68-sequence.py b/test/functional/bip68-sequence.py
index 87a50692f6..6968b46f73 100755
--- a/test/functional/bip68-sequence.py
+++ b/test/functional/bip68-sequence.py
@@ -387,7 +387,7 @@ class BIP68Test(BitcoinTestFramework):
         tx = FromHex(CTransaction(), rawtxfund)
         tx.nVersion = 2
         tx_signed = self.nodes[1].signrawtransaction(ToHex(tx))["hex"]
-        tx_id = self.nodes[1].sendrawtransaction(tx_signed)
+        self.nodes[1].sendrawtransaction(tx_signed)
 
 if __name__ == '__main__':
     BIP68Test().main()
diff --git a/test/functional/bumpfee.py b/test/functional/bumpfee.py
index 9633ffdebb..553ef4cd00 100755
--- a/test/functional/bumpfee.py
+++ b/test/functional/bumpfee.py
@@ -167,7 +167,7 @@ def test_bumpfee_with_descendant_fails(rbf_node, rbf_node_address, dest_address)
     parent_id = spend_one_input(rbf_node, rbf_node_address)
     tx = rbf_node.createrawtransaction([{"txid": parent_id, "vout": 0}], {dest_address: 0.00020000})
     tx = rbf_node.signrawtransaction(tx)
-    txid = rbf_node.sendrawtransaction(tx["hex"])
+    rbf_node.sendrawtransaction(tx["hex"])
     assert_raises_jsonrpc(-8, "Transaction has descendants in the wallet", rbf_node.bumpfee, parent_id)
 
 
diff --git a/test/functional/fundrawtransaction.py b/test/functional/fundrawtransaction.py
index f2f4efcf28..9074223cb0 100755
--- a/test/functional/fundrawtransaction.py
+++ b/test/functional/fundrawtransaction.py
@@ -312,7 +312,6 @@ class RawTransactionsTest(BitcoinTestFramework):
         ##############################################
         # test a fundrawtransaction with invalid vin #
         ##############################################
-        listunspent = self.nodes[2].listunspent()
         inputs  = [ {'txid' : "1c7f966dab21119bac53213a2bc7532bff1fa844c124fd750a7d0b1332440bd1", 'vout' : 0} ] #invalid vin!
         outputs = { self.nodes[0].getnewaddress() : 1.0}
         rawtx   = self.nodes[2].createrawtransaction(inputs, outputs)
diff --git a/test/functional/import-rescan.py b/test/functional/import-rescan.py
index 4fc5078217..13e1bdecd3 100755
--- a/test/functional/import-rescan.py
+++ b/test/functional/import-rescan.py
@@ -161,7 +161,6 @@ class ImportRescanTest(BitcoinTestFramework):
                 variant.check()
 
         # Create new transactions sending to each address.
-        fee = self.nodes[0].getnetworkinfo()["relayfee"]
         for i, variant in enumerate(IMPORT_VARIANTS):
             variant.sent_amount = 10 - (2 * i + 1) / 8.0
             variant.sent_txid = self.nodes[0].sendtoaddress(variant.address["address"], variant.sent_amount)
diff --git a/test/functional/importmulti.py b/test/functional/importmulti.py
index e83e85de13..18a3df028f 100755
--- a/test/functional/importmulti.py
+++ b/test/functional/importmulti.py
@@ -21,16 +21,7 @@ class ImportMultiTest (BitcoinTestFramework):
         self.nodes[1].generate(1)
         timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
 
-        # keyword definition
-        PRIV_KEY = 'privkey'
-        PUB_KEY = 'pubkey'
-        ADDRESS_KEY = 'address'
-        SCRIPT_KEY = 'script'
-
-
         node0_address1 = self.nodes[0].validateaddress(self.nodes[0].getnewaddress())
-        node0_address2 = self.nodes[0].validateaddress(self.nodes[0].getnewaddress())
-        node0_address3 = self.nodes[0].validateaddress(self.nodes[0].getnewaddress())
 
         #Check only one address
         assert_equal(node0_address1['ismine'], True)
@@ -230,7 +221,6 @@ class ImportMultiTest (BitcoinTestFramework):
         transactionid = self.nodes[1].sendtoaddress(multi_sig_script['address'], 10.00)
         self.nodes[1].generate(1)
         timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
-        transaction = self.nodes[1].gettransaction(transactionid)
 
         self.log.info("Should import a p2sh")
         result = self.nodes[1].importmulti([{
@@ -258,7 +248,6 @@ class ImportMultiTest (BitcoinTestFramework):
         transactionid = self.nodes[1].sendtoaddress(multi_sig_script['address'], 10.00)
         self.nodes[1].generate(1)
         timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
-        transaction = self.nodes[1].gettransaction(transactionid)
 
         self.log.info("Should import a p2sh with respective redeem script")
         result = self.nodes[1].importmulti([{
@@ -286,7 +275,6 @@ class ImportMultiTest (BitcoinTestFramework):
         transactionid = self.nodes[1].sendtoaddress(multi_sig_script['address'], 10.00)
         self.nodes[1].generate(1)
         timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
-        transaction = self.nodes[1].gettransaction(transactionid)
 
         self.log.info("Should import a p2sh with respective redeem script and private keys")
         result = self.nodes[1].importmulti([{
@@ -314,7 +302,6 @@ class ImportMultiTest (BitcoinTestFramework):
         transactionid = self.nodes[1].sendtoaddress(multi_sig_script['address'], 10.00)
         self.nodes[1].generate(1)
         timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
-        transaction = self.nodes[1].gettransaction(transactionid)
 
         self.log.info("Should import a p2sh with respective redeem script and private keys")
         result = self.nodes[1].importmulti([{
diff --git a/test/functional/importprunedfunds.py b/test/functional/importprunedfunds.py
index 94753fe431..4e88fc592e 100755
--- a/test/functional/importprunedfunds.py
+++ b/test/functional/importprunedfunds.py
@@ -24,7 +24,6 @@ class ImportPrunedFundsTest(BitcoinTestFramework):
         address1 = self.nodes[0].getnewaddress()
         # pubkey
         address2 = self.nodes[0].getnewaddress()
-        address2_pubkey = self.nodes[0].validateaddress(address2)['pubkey']                 # Using pubkey
         # privkey
         address3 = self.nodes[0].getnewaddress()
         address3_privkey = self.nodes[0].dumpprivkey(address3)                              # Using privkey
@@ -77,13 +76,13 @@ class ImportPrunedFundsTest(BitcoinTestFramework):
 
         #Import with affiliated address with no rescan
         self.nodes[1].importaddress(address2, "add2", False)
-        result2 = self.nodes[1].importprunedfunds(rawtxn2, proof2)
+        self.nodes[1].importprunedfunds(rawtxn2, proof2)
         balance2 = self.nodes[1].getbalance("add2", 0, True)
         assert_equal(balance2, Decimal('0.05'))
 
         #Import with private key with no rescan
         self.nodes[1].importprivkey(address3_privkey, "add3", False)
-        result3 = self.nodes[1].importprunedfunds(rawtxn3, proof3)
+        self.nodes[1].importprunedfunds(rawtxn3, proof3)
         balance3 = self.nodes[1].getbalance("add3", 0, False)
         assert_equal(balance3, Decimal('0.025'))
         balance3 = self.nodes[1].getbalance("*", 0, True)
diff --git a/test/functional/mempool_packages.py b/test/functional/mempool_packages.py
index e225493816..423d03eacb 100755
--- a/test/functional/mempool_packages.py
+++ b/test/functional/mempool_packages.py
@@ -213,7 +213,7 @@ class MempoolPackagesTest(BitcoinTestFramework):
         value = send_value
 
         # Create tx1
-        (tx1_id, tx1_value) = self.chain_transaction(self.nodes[0], tx0_id, 0, value, fee, 1)
+        tx1_id, _ = self.chain_transaction(self.nodes[0], tx0_id, 0, value, fee, 1)
 
         # Create tx2-7
         vout = 1
diff --git a/test/functional/p2p-compactblocks.py b/test/functional/p2p-compactblocks.py
index c5c264765a..91c0c406ff 100755
--- a/test/functional/p2p-compactblocks.py
+++ b/test/functional/p2p-compactblocks.py
@@ -286,7 +286,8 @@ class CompactBlocksTest(BitcoinTestFramework):
 
         # Store the raw block in our internal format.
         block = FromHex(CBlock(), node.getblock("%02x" % block_hash, False))
-        [tx.calc_sha256() for tx in block.vtx]
+        for tx in block.vtx:
+            tx.calc_sha256()
         block.rehash()
 
         # Wait until the block was announced (via compact blocks)
diff --git a/test/functional/p2p-fullblocktest.py b/test/functional/p2p-fullblocktest.py
index e7fe7372c8..92af0fefd0 100755
--- a/test/functional/p2p-fullblocktest.py
+++ b/test/functional/p2p-fullblocktest.py
@@ -397,7 +397,7 @@ class FullBlockTest(ComparisonTestFramework):
         yield rejected(RejectResult(16, b'bad-cb-length'))
 
         # Extend the b26 chain to make sure bitcoind isn't accepting b26
-        b27 = block(27, spend=out[7])
+        block(27, spend=out[7])
         yield rejected(False)
 
         # Now try a too-large-coinbase script
@@ -409,7 +409,7 @@ class FullBlockTest(ComparisonTestFramework):
         yield rejected(RejectResult(16, b'bad-cb-length'))
 
         # Extend the b28 chain to make sure bitcoind isn't accepting b28
-        b29 = block(29, spend=out[7])
+        block(29, spend=out[7])
         yield rejected(False)
 
         # b30 has a max-sized coinbase scriptSig.
@@ -581,7 +581,7 @@ class FullBlockTest(ComparisonTestFramework):
 
         # same as b40, but one less sigop
         tip(39)
-        b41 = block(41, spend=None)
+        block(41, spend=None)
         update_block(41, b40.vtx[1:-1])
         b41_sigops_to_fill = b40_sigops_to_fill - 1
         tx = CTransaction()
@@ -927,7 +927,7 @@ class FullBlockTest(ComparisonTestFramework):
         # -> b42 (12) -> b43 (13) -> b53 (14) -> b55 (15) -> b57 (16) -> b60 (17) -> b64 (18) -> b65 (19)
         #
         tip(64)
-        b65 = block(65)
+        block(65)
         tx1 = create_and_sign_tx(out[19].tx, out[19].n, out[19].tx.vout[0].nValue)
         tx2 = create_and_sign_tx(tx1, 0, 0)
         update_block(65, [tx1, tx2])
@@ -939,7 +939,7 @@ class FullBlockTest(ComparisonTestFramework):
         # -> b43 (13) -> b53 (14) -> b55 (15) -> b57 (16) -> b60 (17) -> b64 (18) -> b65 (19)
         #                                                                                    \-> b66 (20)
         tip(65)
-        b66 = block(66)
+        block(66)
         tx1 = create_and_sign_tx(out[20].tx, out[20].n, out[20].tx.vout[0].nValue)
         tx2 = create_and_sign_tx(tx1, 0, 1)
         update_block(66, [tx2, tx1])
@@ -952,7 +952,7 @@ class FullBlockTest(ComparisonTestFramework):
         #
         #
         tip(65)
-        b67 = block(67)
+        block(67)
         tx1 = create_and_sign_tx(out[20].tx, out[20].n, out[20].tx.vout[0].nValue)
         tx2 = create_and_sign_tx(tx1, 0, 1)
         tx3 = create_and_sign_tx(tx1, 0, 2)
@@ -972,7 +972,7 @@ class FullBlockTest(ComparisonTestFramework):
         #       this succeeds
         #
         tip(65)
-        b68 = block(68, additional_coinbase_value=10)
+        block(68, additional_coinbase_value=10)
         tx = create_and_sign_tx(out[20].tx, out[20].n, out[20].tx.vout[0].nValue-9)
         update_block(68, [tx])
         yield rejected(RejectResult(16, b'bad-cb-amount'))
@@ -1175,7 +1175,7 @@ class FullBlockTest(ComparisonTestFramework):
         #
         #  -> b81 (26) -> b82 (27) -> b83 (28)
         #
-        b83 = block(83)
+        block(83)
         op_codes = [OP_IF, OP_INVALIDOPCODE, OP_ELSE, OP_TRUE, OP_ENDIF]
         script = CScript(op_codes)
         tx1 = create_and_sign_tx(out[28].tx, out[28].n, out[28].tx.vout[0].nValue, script)
@@ -1195,7 +1195,7 @@ class FullBlockTest(ComparisonTestFramework):
         #                                    \-> b85 (29) -> b86 (30)            \-> b89a (32)
         #
         #
-        b84 = block(84)
+        block(84)
         tx1 = create_tx(out[29].tx, out[29].n, 0, CScript([OP_RETURN]))
         tx1.vout.append(CTxOut(0, CScript([OP_TRUE])))
         tx1.vout.append(CTxOut(0, CScript([OP_TRUE])))
diff --git a/test/functional/p2p-segwit.py b/test/functional/p2p-segwit.py
index 63dfbb8ae6..de69cba393 100755
--- a/test/functional/p2p-segwit.py
+++ b/test/functional/p2p-segwit.py
@@ -17,7 +17,6 @@ from binascii import hexlify
 # The versionbit bit used to signal activation of SegWit
 VB_WITNESS_BIT = 1
 VB_PERIOD = 144
-VB_ACTIVATION_THRESHOLD = 108
 VB_TOP_BITS = 0x20000000
 
 MAX_SIGOP_COST = 80000
diff --git a/test/functional/preciousblock.py b/test/functional/preciousblock.py
index 04b41e76ba..a69b8fb20c 100755
--- a/test/functional/preciousblock.py
+++ b/test/functional/preciousblock.py
@@ -47,16 +47,16 @@ class PreciousTest(BitcoinTestFramework):
         self.log.info("Ensure submitblock can in principle reorg to a competing chain")
         self.nodes[0].generate(1)
         assert_equal(self.nodes[0].getblockcount(), 1)
-        (hashY, hashZ) = self.nodes[1].generate(2)
+        hashZ = self.nodes[1].generate(2)[-1]
         assert_equal(self.nodes[1].getblockcount(), 2)
         node_sync_via_rpc(self.nodes[0:3])
         assert_equal(self.nodes[0].getbestblockhash(), hashZ)
 
         self.log.info("Mine blocks A-B-C on Node 0")
-        (hashA, hashB, hashC) = self.nodes[0].generate(3)
+        hashC = self.nodes[0].generate(3)[-1]
         assert_equal(self.nodes[0].getblockcount(), 5)
         self.log.info("Mine competing blocks E-F-G on Node 1")
-        (hashE, hashF, hashG) = self.nodes[1].generate(3)
+        hashG = self.nodes[1].generate(3)[-1]
         assert_equal(self.nodes[1].getblockcount(), 5)
         assert(hashC != hashG)
         self.log.info("Connect nodes and check no reorg occurs")
diff --git a/test/functional/rawtransactions.py b/test/functional/rawtransactions.py
index b6b90d6781..847553097f 100755
--- a/test/functional/rawtransactions.py
+++ b/test/functional/rawtransactions.py
@@ -63,7 +63,6 @@ class RawTransactionsTest(BitcoinTestFramework):
         addr2Obj = self.nodes[2].validateaddress(addr2)
 
         mSigObj = self.nodes[2].addmultisigaddress(2, [addr1Obj['pubkey'], addr2Obj['pubkey']])
-        mSigObjValid = self.nodes[2].validateaddress(mSigObj)
 
         #use balance deltas instead of absolute values
         bal = self.nodes[2].getbalance()
@@ -87,7 +86,6 @@ class RawTransactionsTest(BitcoinTestFramework):
         addr3Obj = self.nodes[2].validateaddress(addr3)
 
         mSigObj = self.nodes[2].addmultisigaddress(2, [addr1Obj['pubkey'], addr2Obj['pubkey'], addr3Obj['pubkey']])
-        mSigObjValid = self.nodes[2].validateaddress(mSigObj)
 
         txId = self.nodes[0].sendtoaddress(mSigObj, 2.2)
         decTx = self.nodes[0].gettransaction(txId)
diff --git a/test/functional/replace-by-fee.py b/test/functional/replace-by-fee.py
index bc67654987..4f33bb58b9 100755
--- a/test/functional/replace-by-fee.py
+++ b/test/functional/replace-by-fee.py
@@ -270,7 +270,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx1a.vin = [CTxIn(tx0_outpoint, nSequence=0)]
         tx1a.vout = [CTxOut(1*COIN, CScript([b'a']))]
         tx1a_hex = txToHex(tx1a)
-        tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, True)
+        self.nodes[0].sendrawtransaction(tx1a_hex, True)
 
         # Higher fee, but the fee per KB is much lower, so the replacement is
         # rejected.
@@ -331,7 +331,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx1.vin = [CTxIn(confirmed_utxo)]
         tx1.vout = [CTxOut(1*COIN, CScript([b'a']))]
         tx1_hex = txToHex(tx1)
-        tx1_txid = self.nodes[0].sendrawtransaction(tx1_hex, True)
+        self.nodes[0].sendrawtransaction(tx1_hex, True)
 
         tx2 = CTransaction()
         tx2.vin = [CTxIn(confirmed_utxo), CTxIn(unconfirmed_utxo)]
@@ -499,7 +499,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx2a.vin = [CTxIn(tx1_outpoint, nSequence=0)]
         tx2a.vout = [CTxOut(1*COIN, CScript([b'a']))]
         tx2a_hex = txToHex(tx2a)
-        tx2a_txid = self.nodes[0].sendrawtransaction(tx2a_hex, True)
+        self.nodes[0].sendrawtransaction(tx2a_hex, True)
 
         # Lower fee, but we'll prioritise it
         tx2b = CTransaction()
diff --git a/test/functional/segwit.py b/test/functional/segwit.py
index 51eaa34a54..7bcb393012 100755
--- a/test/functional/segwit.py
+++ b/test/functional/segwit.py
@@ -12,7 +12,6 @@ from test_framework.script import CScript, OP_HASH160, OP_CHECKSIG, OP_0, hash16
 from io import BytesIO
 
 NODE_0 = 0
-NODE_1 = 1
 NODE_2 = 2
 WIT_V0 = 0
 WIT_V1 = 1
diff --git a/test/functional/test_framework/address.py b/test/functional/test_framework/address.py
index 96bebe1ea1..180dac197e 100644
--- a/test/functional/test_framework/address.py
+++ b/test/functional/test_framework/address.py
@@ -44,16 +44,6 @@ def script_to_p2sh(script, main = False):
     script = check_script(script)
     return scripthash_to_p2sh(hash160(script), main)
 
-def key_to_p2sh_p2wpkh(key, main = False):
-    key = check_key(key)
-    p2shscript = CScript([OP_0, hash160(key)])
-    return script_to_p2sh(p2shscript, main)
-
-def script_to_p2sh_p2wsh(script, main = False):
-    script = check_script(script)
-    p2shscript = CScript([OP_0, sha256(script)])
-    return script_to_p2sh(p2shscript, main)
-
 def check_key(key):
     if (type(key) is str):
         key = hex_str_to_bytes(key) # Assuming this is hex string
diff --git a/test/functional/test_framework/bignum.py b/test/functional/test_framework/bignum.py
index 024611da6e..db5ccd62c2 100644
--- a/test/functional/test_framework/bignum.py
+++ b/test/functional/test_framework/bignum.py
@@ -26,12 +26,6 @@ def bn2bin(v):
         i -= 1
     return s
 
-def bin2bn(s):
-    l = 0
-    for ch in s:
-        l = (l << 8) | ch
-    return l
-
 def bn2mpi(v):
     have_ext = False
     if v.bit_length() > 0:
@@ -54,30 +48,6 @@ def bn2mpi(v):
             v_bin[0] |= 0x80
     return s + ext + v_bin
 
-def mpi2bn(s):
-    if len(s) < 4:
-        return None
-    s_size = bytes(s[:4])
-    v_len = struct.unpack(b">I", s_size)[0]
-    if len(s) != (v_len + 4):
-        return None
-    if v_len == 0:
-        return 0
-
-    v_str = bytearray(s[4:])
-    neg = False
-    i = v_str[0]
-    if i & 0x80:
-        neg = True
-        i &= ~0x80
-        v_str[0] = i
-
-    v = bin2bn(v_str)
-
-    if neg:
-        return -v
-    return v
-
 # bitcoin-specific little endian format, with implicit size
 def mpi2vch(s):
     r = s[4:]           # strip size
@@ -86,12 +56,3 @@ def mpi2vch(s):
 
 def bn2vch(v):
     return bytes(mpi2vch(bn2mpi(v)))
-
-def vch2mpi(s):
-    r = struct.pack(b">I", len(s))   # size
-    r += s[::-1]            # reverse string, converting LE->BE
-    return r
-
-def vch2bn(s):
-    return mpi2bn(vch2mpi(s))
-
diff --git a/test/functional/test_framework/blockstore.py b/test/functional/test_framework/blockstore.py
index 4cfd682bb5..4b2170a03f 100644
--- a/test/functional/test_framework/blockstore.py
+++ b/test/functional/test_framework/blockstore.py
@@ -143,16 +143,6 @@ class TxStore(object):
             return None
         return value
 
-    def get_transaction(self, txhash):
-        ret = None
-        serialized_tx = self.get(txhash)
-        if serialized_tx is not None:
-            f = BytesIO(serialized_tx)
-            ret = CTransaction()
-            ret.deserialize(f)
-            ret.calc_sha256()
-        return ret
-
     def add_transaction(self, tx):
         tx.calc_sha256()
         try:
diff --git a/test/functional/test_framework/mininode.py b/test/functional/test_framework/mininode.py
index d0753276db..2607b9b07c 100755
--- a/test/functional/test_framework/mininode.py
+++ b/test/functional/test_framework/mininode.py
@@ -48,8 +48,8 @@ MAX_BLOCK_BASE_SIZE = 1000000
 COIN = 100000000 # 1 btc in satoshis
 
 NODE_NETWORK = (1 << 0)
-NODE_GETUTXO = (1 << 1)
-NODE_BLOOM = (1 << 2)
+# NODE_GETUTXO = (1 << 1)
+# NODE_BLOOM = (1 << 2)
 NODE_WITNESS = (1 << 3)
 NODE_UNSUPPORTED_SERVICE_BIT_5 = (1 << 5)
 NODE_UNSUPPORTED_SERVICE_BIT_7 = (1 << 7)
@@ -1479,9 +1479,6 @@ class NodeConnCB(object):
         # before acquiring the global lock and delivering the next message.
         self.deliver_sleep_time = None
 
-        # Remember the services our peer has advertised
-        self.peer_services = None
-
     # Message receiving methods
 
     def deliver(self, conn, message):
@@ -1506,10 +1503,6 @@ class NodeConnCB(object):
                 print("ERROR delivering %s (%s)" % (repr(message),
                                                     sys.exc_info()[0]))
 
-    def set_deliver_sleep_time(self, value):
-        with mininode_lock:
-            self.deliver_sleep_time = value
-
     def get_deliver_sleep_time(self):
         with mininode_lock:
             return self.deliver_sleep_time
diff --git a/test/functional/test_framework/netutil.py b/test/functional/test_framework/netutil.py
index 45d8e22d22..e5d415788f 100644
--- a/test/functional/test_framework/netutil.py
+++ b/test/functional/test_framework/netutil.py
@@ -15,17 +15,17 @@ import array
 import os
 from binascii import unhexlify, hexlify
 
-STATE_ESTABLISHED = '01'
-STATE_SYN_SENT  = '02'
-STATE_SYN_RECV = '03'
-STATE_FIN_WAIT1 = '04'
-STATE_FIN_WAIT2 = '05'
-STATE_TIME_WAIT = '06'
-STATE_CLOSE = '07'
-STATE_CLOSE_WAIT = '08'
-STATE_LAST_ACK = '09'
+# STATE_ESTABLISHED = '01'
+# STATE_SYN_SENT  = '02'
+# STATE_SYN_RECV = '03'
+# STATE_FIN_WAIT1 = '04'
+# STATE_FIN_WAIT2 = '05'
+# STATE_TIME_WAIT = '06'
+# STATE_CLOSE = '07'
+# STATE_CLOSE_WAIT = '08'
+# STATE_LAST_ACK = '09'
 STATE_LISTEN = '0A'
-STATE_CLOSING = '0B'
+# STATE_CLOSING = '0B'
 
 def get_socket_inodes(pid):
     '''
diff --git a/test/functional/test_framework/script.py b/test/functional/test_framework/script.py
index 3d9572788e..8f5339a02a 100644
--- a/test/functional/test_framework/script.py
+++ b/test/functional/test_framework/script.py
@@ -23,9 +23,7 @@ import struct
 
 from .bignum import bn2vch
 
-MAX_SCRIPT_SIZE = 10000
 MAX_SCRIPT_ELEMENT_SIZE = 520
-MAX_SCRIPT_OPCODES = 201
 
 OPCODE_NAMES = {}
 
@@ -242,131 +240,6 @@ OP_PUBKEY = CScriptOp(0xfe)
 
 OP_INVALIDOPCODE = CScriptOp(0xff)
 
-VALID_OPCODES = {
-    OP_1NEGATE,
-    OP_RESERVED,
-    OP_1,
-    OP_2,
-    OP_3,
-    OP_4,
-    OP_5,
-    OP_6,
-    OP_7,
-    OP_8,
-    OP_9,
-    OP_10,
-    OP_11,
-    OP_12,
-    OP_13,
-    OP_14,
-    OP_15,
-    OP_16,
-
-    OP_NOP,
-    OP_VER,
-    OP_IF,
-    OP_NOTIF,
-    OP_VERIF,
-    OP_VERNOTIF,
-    OP_ELSE,
-    OP_ENDIF,
-    OP_VERIFY,
-    OP_RETURN,
-
-    OP_TOALTSTACK,
-    OP_FROMALTSTACK,
-    OP_2DROP,
-    OP_2DUP,
-    OP_3DUP,
-    OP_2OVER,
-    OP_2ROT,
-    OP_2SWAP,
-    OP_IFDUP,
-    OP_DEPTH,
-    OP_DROP,
-    OP_DUP,
-    OP_NIP,
-    OP_OVER,
-    OP_PICK,
-    OP_ROLL,
-    OP_ROT,
-    OP_SWAP,
-    OP_TUCK,
-
-    OP_CAT,
-    OP_SUBSTR,
-    OP_LEFT,
-    OP_RIGHT,
-    OP_SIZE,
-
-    OP_INVERT,
-    OP_AND,
-    OP_OR,
-    OP_XOR,
-    OP_EQUAL,
-    OP_EQUALVERIFY,
-    OP_RESERVED1,
-    OP_RESERVED2,
-
-    OP_1ADD,
-    OP_1SUB,
-    OP_2MUL,
-    OP_2DIV,
-    OP_NEGATE,
-    OP_ABS,
-    OP_NOT,
-    OP_0NOTEQUAL,
-
-    OP_ADD,
-    OP_SUB,
-    OP_MUL,
-    OP_DIV,
-    OP_MOD,
-    OP_LSHIFT,
-    OP_RSHIFT,
-
-    OP_BOOLAND,
-    OP_BOOLOR,
-    OP_NUMEQUAL,
-    OP_NUMEQUALVERIFY,
-    OP_NUMNOTEQUAL,
-    OP_LESSTHAN,
-    OP_GREATERTHAN,
-    OP_LESSTHANOREQUAL,
-    OP_GREATERTHANOREQUAL,
-    OP_MIN,
-    OP_MAX,
-
-    OP_WITHIN,
-
-    OP_RIPEMD160,
-    OP_SHA1,
-    OP_SHA256,
-    OP_HASH160,
-    OP_HASH256,
-    OP_CODESEPARATOR,
-    OP_CHECKSIG,
-    OP_CHECKSIGVERIFY,
-    OP_CHECKMULTISIG,
-    OP_CHECKMULTISIGVERIFY,
-
-    OP_NOP1,
-    OP_CHECKLOCKTIMEVERIFY,
-    OP_CHECKSEQUENCEVERIFY,
-    OP_NOP4,
-    OP_NOP5,
-    OP_NOP6,
-    OP_NOP7,
-    OP_NOP8,
-    OP_NOP9,
-    OP_NOP10,
-
-    OP_SMALLINTEGER,
-    OP_PUBKEYS,
-    OP_PUBKEYHASH,
-    OP_PUBKEY,
-}
-
 OPCODE_NAMES.update({
     OP_0 : 'OP_0',
     OP_PUSHDATA1 : 'OP_PUSHDATA1',
@@ -486,124 +359,6 @@ OPCODE_NAMES.update({
     OP_INVALIDOPCODE : 'OP_INVALIDOPCODE',
 })
 
-OPCODES_BY_NAME = {
-    'OP_0' : OP_0,
-    'OP_PUSHDATA1' : OP_PUSHDATA1,
-    'OP_PUSHDATA2' : OP_PUSHDATA2,
-    'OP_PUSHDATA4' : OP_PUSHDATA4,
-    'OP_1NEGATE' : OP_1NEGATE,
-    'OP_RESERVED' : OP_RESERVED,
-    'OP_1' : OP_1,
-    'OP_2' : OP_2,
-    'OP_3' : OP_3,
-    'OP_4' : OP_4,
-    'OP_5' : OP_5,
-    'OP_6' : OP_6,
-    'OP_7' : OP_7,
-    'OP_8' : OP_8,
-    'OP_9' : OP_9,
-    'OP_10' : OP_10,
-    'OP_11' : OP_11,
-    'OP_12' : OP_12,
-    'OP_13' : OP_13,
-    'OP_14' : OP_14,
-    'OP_15' : OP_15,
-    'OP_16' : OP_16,
-    'OP_NOP' : OP_NOP,
-    'OP_VER' : OP_VER,
-    'OP_IF' : OP_IF,
-    'OP_NOTIF' : OP_NOTIF,
-    'OP_VERIF' : OP_VERIF,
-    'OP_VERNOTIF' : OP_VERNOTIF,
-    'OP_ELSE' : OP_ELSE,
-    'OP_ENDIF' : OP_ENDIF,
-    'OP_VERIFY' : OP_VERIFY,
-    'OP_RETURN' : OP_RETURN,
-    'OP_TOALTSTACK' : OP_TOALTSTACK,
-    'OP_FROMALTSTACK' : OP_FROMALTSTACK,
-    'OP_2DROP' : OP_2DROP,
-    'OP_2DUP' : OP_2DUP,
-    'OP_3DUP' : OP_3DUP,
-    'OP_2OVER' : OP_2OVER,
-    'OP_2ROT' : OP_2ROT,
-    'OP_2SWAP' : OP_2SWAP,
-    'OP_IFDUP' : OP_IFDUP,
-    'OP_DEPTH' : OP_DEPTH,
-    'OP_DROP' : OP_DROP,
-    'OP_DUP' : OP_DUP,
-    'OP_NIP' : OP_NIP,
-    'OP_OVER' : OP_OVER,
-    'OP_PICK' : OP_PICK,
-    'OP_ROLL' : OP_ROLL,
-    'OP_ROT' : OP_ROT,
-    'OP_SWAP' : OP_SWAP,
-    'OP_TUCK' : OP_TUCK,
-    'OP_CAT' : OP_CAT,
-    'OP_SUBSTR' : OP_SUBSTR,
-    'OP_LEFT' : OP_LEFT,
-    'OP_RIGHT' : OP_RIGHT,
-    'OP_SIZE' : OP_SIZE,
-    'OP_INVERT' : OP_INVERT,
-    'OP_AND' : OP_AND,
-    'OP_OR' : OP_OR,
-    'OP_XOR' : OP_XOR,
-    'OP_EQUAL' : OP_EQUAL,
-    'OP_EQUALVERIFY' : OP_EQUALVERIFY,
-    'OP_RESERVED1' : OP_RESERVED1,
-    'OP_RESERVED2' : OP_RESERVED2,
-    'OP_1ADD' : OP_1ADD,
-    'OP_1SUB' : OP_1SUB,
-    'OP_2MUL' : OP_2MUL,
-    'OP_2DIV' : OP_2DIV,
-    'OP_NEGATE' : OP_NEGATE,
-    'OP_ABS' : OP_ABS,
-    'OP_NOT' : OP_NOT,
-    'OP_0NOTEQUAL' : OP_0NOTEQUAL,
-    'OP_ADD' : OP_ADD,
-    'OP_SUB' : OP_SUB,
-    'OP_MUL' : OP_MUL,
-    'OP_DIV' : OP_DIV,
-    'OP_MOD' : OP_MOD,
-    'OP_LSHIFT' : OP_LSHIFT,
-    'OP_RSHIFT' : OP_RSHIFT,
-    'OP_BOOLAND' : OP_BOOLAND,
-    'OP_BOOLOR' : OP_BOOLOR,
-    'OP_NUMEQUAL' : OP_NUMEQUAL,
-    'OP_NUMEQUALVERIFY' : OP_NUMEQUALVERIFY,
-    'OP_NUMNOTEQUAL' : OP_NUMNOTEQUAL,
-    'OP_LESSTHAN' : OP_LESSTHAN,
-    'OP_GREATERTHAN' : OP_GREATERTHAN,
-    'OP_LESSTHANOREQUAL' : OP_LESSTHANOREQUAL,
-    'OP_GREATERTHANOREQUAL' : OP_GREATERTHANOREQUAL,
-    'OP_MIN' : OP_MIN,
-    'OP_MAX' : OP_MAX,
-    'OP_WITHIN' : OP_WITHIN,
-    'OP_RIPEMD160' : OP_RIPEMD160,
-    'OP_SHA1' : OP_SHA1,
-    'OP_SHA256' : OP_SHA256,
-    'OP_HASH160' : OP_HASH160,
-    'OP_HASH256' : OP_HASH256,
-    'OP_CODESEPARATOR' : OP_CODESEPARATOR,
-    'OP_CHECKSIG' : OP_CHECKSIG,
-    'OP_CHECKSIGVERIFY' : OP_CHECKSIGVERIFY,
-    'OP_CHECKMULTISIG' : OP_CHECKMULTISIG,
-    'OP_CHECKMULTISIGVERIFY' : OP_CHECKMULTISIGVERIFY,
-    'OP_NOP1' : OP_NOP1,
-    'OP_CHECKLOCKTIMEVERIFY' : OP_CHECKLOCKTIMEVERIFY,
-    'OP_CHECKSEQUENCEVERIFY' : OP_CHECKSEQUENCEVERIFY,
-    'OP_NOP4' : OP_NOP4,
-    'OP_NOP5' : OP_NOP5,
-    'OP_NOP6' : OP_NOP6,
-    'OP_NOP7' : OP_NOP7,
-    'OP_NOP8' : OP_NOP8,
-    'OP_NOP9' : OP_NOP9,
-    'OP_NOP10' : OP_NOP10,
-    'OP_SMALLINTEGER' : OP_SMALLINTEGER,
-    'OP_PUBKEYS' : OP_PUBKEYS,
-    'OP_PUBKEYHASH' : OP_PUBKEYHASH,
-    'OP_PUBKEY' : OP_PUBKEY,
-}
-
 class CScriptInvalidError(Exception):
     """Base class for CScript exceptions"""
     pass
diff --git a/test/functional/test_framework/socks5.py b/test/functional/test_framework/socks5.py
index a08b03ed24..0070844168 100644
--- a/test/functional/test_framework/socks5.py
+++ b/test/functional/test_framework/socks5.py
@@ -91,7 +91,7 @@ class Socks5Connection(object):
                 self.conn.sendall(bytearray([0x01, 0x00]))
 
             # Read connect request
-            (ver,cmd,rsv,atyp) = recvall(self.conn, 4)
+            ver, cmd, _, atyp = recvall(self.conn, 4)
             if ver != 0x05:
                 raise IOError('Invalid socks version %i in connect request' % ver)
             if cmd != Command.CONNECT:
diff --git a/test/functional/wallet-dump.py b/test/functional/wallet-dump.py
index 61ad00330b..b573a95aba 100755
--- a/test/functional/wallet-dump.py
+++ b/test/functional/wallet-dump.py
@@ -101,7 +101,7 @@ class WalletDumpTest(BitcoinTestFramework):
         self.nodes[0].keypoolrefill()
         self.nodes[0].dumpwallet(tmpdir + "/node0/wallet.encrypted.dump")
 
-        found_addr, found_addr_chg, found_addr_rsv, hd_master_addr_enc = \
+        found_addr, found_addr_chg, found_addr_rsv, _ = \
             read_dump(tmpdir + "/node0/wallet.encrypted.dump", addrs, hd_master_addr_unenc)
         assert_equal(found_addr, test_addr_count)
         assert_equal(found_addr_chg, 90*2 + 50)  # old reserve keys are marked as change now
diff --git a/test/functional/wallet.py b/test/functional/wallet.py
index 3e3e8fcddb..40225ad55d 100755
--- a/test/functional/wallet.py
+++ b/test/functional/wallet.py
@@ -206,7 +206,7 @@ class WalletTest(BitcoinTestFramework):
         signedRawTx = self.nodes[1].signrawtransaction(rawTx)
         decRawTx = self.nodes[1].decoderawtransaction(signedRawTx['hex'])
         zeroValueTxid= decRawTx['txid']
-        sendResp = self.nodes[1].sendrawtransaction(signedRawTx['hex'])
+        self.nodes[1].sendrawtransaction(signedRawTx['hex'])
 
         self.sync_all()
         self.nodes[1].generate(1) #mine a block