diff --git a/electrum/lnaddr.py b/electrum/lnaddr.py
index 2e504aa8c..a5c42c750 100644
--- a/electrum/lnaddr.py
+++ b/electrum/lnaddr.py
@@ -7,7 +7,7 @@ import time
 from hashlib import sha256
 from binascii import hexlify
 from decimal import Decimal
-from typing import Optional, TYPE_CHECKING, Type, Dict, Any, Union, Sequence, List, Tuple
+from typing import Optional, TYPE_CHECKING, Type, Dict, Any, Sequence, Tuple
 import random
 
 import electrum_ecc as ecc
@@ -535,7 +535,7 @@ def lndecode(invoice: str, *, verbose=False, net=None) -> LnAddr:
             features = int_from_data5(tagdata)
             addr.tags.append(('9', features))
             # note: The features are not validated here in the parser,
-            #       instead, validation is done just before we try paying the invoice (in lnworker._check_invoice).
+            #       instead, validation is done just before we try paying the invoice (in lnworker._check_bolt11_invoice).
             #       Context: invoice parsing happens when opening a wallet. If there was a backwards-incompatible
             #       change to a feature, and we raised, some existing wallets could not be opened. Such a change
             #       can happen to features not-yet-merged-to-BOLTs (e.g. trampoline feature bit was moved and reused).
@@ -557,7 +557,7 @@ def lndecode(invoice: str, *, verbose=False, net=None) -> LnAddr:
     # field specified below).
     addr.signature = sigdecoded[:65]
     hrp_hash = sha256(hrp.encode("ascii") + bytes(convertbits(data5, 5, 8, True))).digest()
-    if addr.pubkey: # Specified by `n`
+    if addr.pubkey:  # Specified by `n`
         # BOLT #11:
         #
         # A reader MUST use the `n` field to validate the signature instead of
@@ -565,8 +565,10 @@ def lndecode(invoice: str, *, verbose=False, net=None) -> LnAddr:
         if not ecc.ECPubkey(addr.pubkey).ecdsa_verify(sigdecoded[:64], hrp_hash):
             raise LnDecodeException("bad signature")
         pubkey_copy = addr.pubkey
+
         class WrappedBytesKey:
             serialize = lambda: pubkey_copy
+
         addr.pubkey = WrappedBytesKey
     else: # Recover pubkey from signature.
         addr.pubkey = SerializableKey(ecc.ECPubkey.from_ecdsa_sig64(sigdecoded[:64], sigdecoded[64], hrp_hash))
diff --git a/electrum/lnhtlc.py b/electrum/lnhtlc.py
index e71457585..9a5950758 100644
--- a/electrum/lnhtlc.py
+++ b/electrum/lnhtlc.py
@@ -1,6 +1,5 @@
 from copy import deepcopy
-from typing import Optional, Sequence, Tuple, List, Dict, TYPE_CHECKING, Set
-import threading
+from typing import Sequence, Tuple, Dict, TYPE_CHECKING, Set
 
 from .lnutil import SENT, RECEIVED, LOCAL, REMOTE, HTLCOwner, UpdateAddHtlc, Direction, FeeUpdate
 from .util import bfh, with_lock
@@ -11,7 +10,7 @@ if TYPE_CHECKING:
 
 class HTLCManager:
 
-    def __init__(self, log:'StoredDict', *, initial_feerate=None):
+    def __init__(self, log: 'StoredDict', *, initial_feerate=None):
 
         if len(log) == 0:
             initial = {
@@ -490,8 +489,7 @@ class HTLCManager:
         return d
 
     @with_lock
-    def all_settled_htlcs_ever(self, subject: HTLCOwner, ctn: int = None) \
-            -> Sequence[Tuple[Direction, UpdateAddHtlc]]:
+    def all_settled_htlcs_ever(self, subject: HTLCOwner, ctn: int = None) -> Sequence[Tuple[Direction, UpdateAddHtlc]]:
         """Return the list of all HTLCs that have been ever settled in subject's
         ctx up to ctn.
         """
@@ -527,14 +525,16 @@ class HTLCManager:
         # sent htlcs
         for htlc_id in considered_sent_htlc_ids:
             ctns = self.log[whose]['settles'].get(htlc_id, None)
-            if ctns is None: continue
+            if ctns is None:
+                continue
             if ctns[ctx_owner] is not None and ctns[ctx_owner] <= ctn:
                 htlc = self.log[whose]['adds'][htlc_id]
                 balance -= htlc.amount_msat
         # recv htlcs
         for htlc_id in considered_recv_htlc_ids:
             ctns = self.log[-whose]['settles'].get(htlc_id, None)
-            if ctns is None: continue
+            if ctns is None:
+                continue
             if ctns[ctx_owner] is not None and ctns[ctx_owner] <= ctn:
                 htlc = self.log[-whose]['adds'][htlc_id]
                 balance += htlc.amount_msat
@@ -551,7 +551,8 @@ class HTLCManager:
         htlcs = []
         for htlc_id in considered_htlc_ids:
             ctns = self.log[htlc_proposer][log_action].get(htlc_id, None)
-            if ctns is None: continue
+            if ctns is None:
+                continue
             if ctns[ctx_owner] == ctn:
                 htlcs.append(self.log[htlc_proposer]['adds'][htlc_id])
         return htlcs
@@ -603,7 +604,7 @@ class HTLCManager:
         right = len(fee_log)
         while True:
             i = (left + right) // 2
-            ctn_at_i = fee_log[i].ctn_local if subject==LOCAL else fee_log[i].ctn_remote
+            ctn_at_i = fee_log[i].ctn_local if subject == LOCAL else fee_log[i].ctn_remote
             if right - left <= 1:
                 break
             if ctn_at_i is None:  # Nones can only be on the right end