diff --git a/mmgen/bip_hd/__init__.py b/mmgen/bip_hd/__init__.py
index 9a134ab4..2e7e06de 100644
--- a/mmgen/bip_hd/__init__.py
+++ b/mmgen/bip_hd/__init__.py
@@ -182,7 +182,13 @@ class MasterNode(Lockable):
 
 		check_privkey(int.from_bytes(self.key, byteorder='big'))
 
-	def init_cfg(self, coin=None, network=None, addr_type=None, from_path=False, no_path_checks=False):
+	def init_cfg(
+			self,
+			coin           = None,
+			network        = None,
+			addr_type      = None,
+			from_path      = False,
+			no_path_checks = False):
 
 		new = BipHDNodeMaster()
 
diff --git a/mmgen/proto/btc/rpc.py b/mmgen/proto/btc/rpc.py
index 20c31a66..8c0a4c13 100755
--- a/mmgen/proto/btc/rpc.py
+++ b/mmgen/proto/btc/rpc.py
@@ -268,7 +268,8 @@ class BitcoinRPCClient(RPCClient, metaclass=AsyncInit):
 
 		fn = self.get_daemon_cfg_fn()
 		try:
-			lines = get_lines_from_file(self.cfg, fn, 'daemon config file', silent=not self.cfg.verbose)
+			lines = get_lines_from_file(
+				self.cfg, fn, 'daemon config file', silent=not self.cfg.verbose)
 		except:
 			self.cfg._util.vmsg(f'Warning: {fn!r} does not exist or is unreadable')
 			return dict((k, None) for k in req_keys)
@@ -287,7 +288,8 @@ class BitcoinRPCClient(RPCClient, metaclass=AsyncInit):
 
 	def get_daemon_auth_cookie(self):
 		fn = self.daemon.auth_cookie_fn
-		return get_lines_from_file(self.cfg, fn, 'cookie', quiet=True)[0] if os.access(fn, os.R_OK) else ''
+		return get_lines_from_file(
+			self.cfg, fn, 'cookie', quiet=True)[0] if os.access(fn, os.R_OK) else ''
 
 	def info(self, info_id):
 
diff --git a/mmgen/proto/btc/tw/ctl.py b/mmgen/proto/btc/tw/ctl.py
index fd06fa85..17ef9c2d 100755
--- a/mmgen/proto/btc/tw/ctl.py
+++ b/mmgen/proto/btc/tw/ctl.py
@@ -27,7 +27,7 @@ class BitcoinTwCtl(TwCtl):
 		raise NotImplementedError('not implemented')
 
 	@write_mode
-	async def import_address(self, addr, label, rescan=False): # rescan is True by default, so set to False
+	async def import_address(self, addr, label, rescan=False):
 		if (await self.rpc.walletinfo).get('descriptors'):
 			return await self.batch_import_address([(addr, label, rescan)])
 		else:
diff --git a/mmgen/tool/rpc.py b/mmgen/tool/rpc.py
index 344f7175..6d95a672 100755
--- a/mmgen/tool/rpc.py
+++ b/mmgen/tool/rpc.py
@@ -204,7 +204,12 @@ class tool_cmd(tool_cmd_base):
 		await (await TwCtl(self.cfg, self.proto, mode='w')).rescan_blockchain(start_block, stop_block)
 		return True
 
-	async def twexport(self, include_amts=True, pretty=False, prune=False, warn_used=False, force=False):
+	async def twexport(self,
+			include_amts = True,
+			pretty       = False,
+			prune        = False,
+			warn_used    = False,
+			force        = False):
 		"""
 		export a tracking wallet to JSON format
 
diff --git a/mmgen/ui.py b/mmgen/ui.py
index 1b38d46a..3a5f48a4 100755
--- a/mmgen/ui.py
+++ b/mmgen/ui.py
@@ -81,12 +81,12 @@ def line_input(cfg, prompt, echo=True, insert_txt='', hold_protect=True):
 	return reply.strip()
 
 def keypress_confirm(
-	cfg,
-	prompt,
-	default_yes     = False,
-	verbose         = False,
-	no_nl           = False,
-	complete_prompt = False):
+		cfg,
+		prompt,
+		default_yes     = False,
+		verbose         = False,
+		no_nl           = False,
+		complete_prompt = False):
 
 	if not complete_prompt:
 		prompt = '{} {}: '.format(prompt, '(Y/n)' if default_yes else '(y/N)')
diff --git a/mmgen/util2.py b/mmgen/util2.py
index f7e26120..364a110d 100755
--- a/mmgen/util2.py
+++ b/mmgen/util2.py
@@ -135,7 +135,13 @@ def format_elapsed_days_hr(t, now=None, cached={}):
 		cached[e] = f'{days} day{suf(days)} ' + ('ago' if e > 0 else 'in the future')
 	return cached[e]
 
-def format_elapsed_hr(t, now=None, cached={}, rel_now=True, show_secs=False, future_msg='in the future'):
+def format_elapsed_hr(
+		t,
+		now        = None,
+		cached     = {},
+		rel_now    = True,
+		show_secs  = False,
+		future_msg = 'in the future'):
 	e = int((now or time.time()) - t)
 	key = f'{e}:{rel_now}:{show_secs}'
 	if not key in cached:
diff --git a/test/cmdtest_d/ct_main.py b/test/cmdtest_d/ct_main.py
index 89518f69..98041657 100755
--- a/test/cmdtest_d/ct_main.py
+++ b/test/cmdtest_d/ct_main.py
@@ -533,7 +533,13 @@ class CmdTestMain(CmdTestBase, CmdTestShared):
 		return self.walletchk(wf, wcls=wcls, dfl_wallet=dfl_wallet)
 
 	def _write_fake_data_to_file(self, d):
-		write_data_to_file(cfg, self.unspent_data_file, d, 'Unspent outputs', quiet=True, ignore_opt_outdir=True)
+		write_data_to_file(
+				cfg,
+				self.unspent_data_file,
+				d,
+				'Unspent outputs',
+				quiet             = True,
+				ignore_opt_outdir = True)
 		if cfg.verbose or cfg.exact_output:
 			sys.stderr.write(f'Fake transaction wallet data written to file {self.unspent_data_file!r}\n')