lint: ruff cleanup pass across bal/ and tests/

- Sort imports and fix pyproject ruff config (per-file ignores for
  intentional Qt/core exceptions)
- Mark Heirs.validate_* helpers as @staticmethod
- Clean up dead code, rename shadowing vars, use raise ... from
- Add AGENTS.md with env/lint/test/release guidance

tests/gui_fixes_test.py

@@ -33,7 +33,8 @@ def _active_source_without_strings(module) -> str:
             if isinstance(node.value, str) and hasattr(node, "end_lineno"):
                 self.spans.append((node.lineno, node.end_lineno))
             self.generic_visit(node)
-    s = _S(); s.visit(tree)
+    s = _S()
+    s.visit(tree)
     drop = set()
     for a, b in s.spans:
         drop.update(range(a, b + 1))
@@ -45,12 +46,13 @@ def _active_source_without_strings(module) -> str:
 
 def main(pkg: str) -> int:
     from PyQt6.QtWidgets import QApplication, QDialog, QWidget
-    app = QApplication.instance() or QApplication(sys.argv)
+    _app = QApplication.instance() or QApplication(sys.argv)
 
     wu = importlib.import_module(pkg + ".gui.qt.window_utils")
 
     # top_level_of: returns the top-level container of a child widget
-    w = QWidget(); child = QWidget(w)
+    w = QWidget()
+    child = QWidget(w)
     assert wu.top_level_of(child) is w
     assert wu.top_level_of(None) is None
     print("[OK] top_level_of")

tests/parallel_ping_test.py

@@ -31,7 +31,7 @@ N = 8       # number of servers
 
 def main():
     we_mod = importlib.import_module(f"{PKG}.core.willexecutors")
-    W = we_mod.Willexecutors
+    we_cls = we_mod.Willexecutors
 
     # ---- 1) ping_servers_parallel: time ~= slowest, not sum ----
     def slow_get_info(url, we, **kwargs):
@@ -43,8 +43,8 @@ def main():
             we["status"] = 200
         return we
 
-    orig_get_info = W.get_info_task
-    W.get_info_task = staticmethod(slow_get_info)
+    orig_get_info = we_cls.get_info_task
+    we_cls.get_info_task = staticmethod(slow_get_info)
     try:
         wes = {}
         for i in range(N):
@@ -57,7 +57,7 @@ def main():
             seen.append((url, ok))
 
         start = time.time()
-        W.ping_servers_parallel(wes, on_each=on_each, max_workers=N)
+        we_cls.ping_servers_parallel(wes, on_each=on_each, max_workers=N)
         elapsed = time.time() - start
 
         # Sequential would take ~ N * SLOW.  Parallel must be far less.
@@ -81,15 +81,15 @@ def main():
                 assert we["status"] == "KO", (url, we)
         print("[OK] ping results written back into the willexecutors mapping")
     finally:
-        W.get_info_task = orig_get_info
+        we_cls.get_info_task = orig_get_info
 
     # ---- 2) push_transactions_parallel: time ~= slowest, not sum ----
     def slow_push(we, **kwargs):
         time.sleep(SLOW)
         return "fail" not in we["url"]
 
-    orig_push = W.push_transactions_to_willexecutor
-    W.push_transactions_to_willexecutor = staticmethod(slow_push)
+    orig_push = we_cls.push_transactions_to_willexecutor
+    we_cls.push_transactions_to_willexecutor = staticmethod(slow_push)
     try:
         wes = {}
         for i in range(N):
@@ -106,7 +106,7 @@ def main():
             pushed.append((url, ok))
 
         start = time.time()
-        results = W.push_transactions_parallel(wes, on_each=on_each_push,
+        results = we_cls.push_transactions_parallel(wes, on_each=on_each_push,
                                                max_workers=N)
         elapsed = time.time() - start
 
@@ -117,11 +117,11 @@ def main():
               f"(sequential would be ~{sequential:.2f}s)")
 
         assert len(results) == N, results
-        for url, (ok, exc) in results.items():
+        for url, (ok, _exc) in results.items():
             assert ok == ("good" in url), (url, ok)
         print("[OK] push results correct for every server")
     finally:
-        W.push_transactions_to_willexecutor = orig_push
+        we_cls.push_transactions_to_willexecutor = orig_push
 
     # ---- 2b) global deadline: a hung server must not block past `deadline` ----
     def hanging_push(we, **kwargs):
@@ -129,8 +129,8 @@ def main():
         time.sleep(10)
         return True
 
-    orig_push2 = W.push_transactions_to_willexecutor
-    W.push_transactions_to_willexecutor = staticmethod(hanging_push)
+    orig_push2 = we_cls.push_transactions_to_willexecutor
+    we_cls.push_transactions_to_willexecutor = staticmethod(hanging_push)
     try:
         wes = {
             "https://fast.example": {
@@ -146,7 +146,7 @@ def main():
                 return True
             time.sleep(10)
             return True
-        W.push_transactions_to_willexecutor = staticmethod(fast_or_hang)
+        we_cls.push_transactions_to_willexecutor = staticmethod(fast_or_hang)
 
         timed_out = []
 
@@ -154,7 +154,7 @@ def main():
             timed_out.append(url)
 
         start = time.time()
-        W.push_transactions_parallel(
+        we_cls.push_transactions_parallel(
             wes, max_workers=2, deadline=1.0, on_timeout=on_timeout
         )
         elapsed = time.time() - start
@@ -163,7 +163,7 @@ def main():
         print(f"[OK] global deadline enforced: returned in {elapsed:.1f}s, "
               f"hung server reported via on_timeout")
     finally:
-        W.push_transactions_to_willexecutor = orig_push2
+        we_cls.push_transactions_to_willexecutor = orig_push2
 
     # ---- 2c) on_tick is fired periodically from the CALLING thread ----
     # The elapsed-time counter is driven by an on_tick callback called from the
@@ -175,8 +175,8 @@ def main():
         time.sleep(SLOW * 6)  # ~3s, long enough for several ticks
         return True
 
-    orig_push3 = W.push_transactions_to_willexecutor
-    W.push_transactions_to_willexecutor = staticmethod(slow_push2)
+    orig_push3 = we_cls.push_transactions_to_willexecutor
+    we_cls.push_transactions_to_willexecutor = staticmethod(slow_push2)
     try:
         wes = {
             "https://tick.example": {
@@ -191,7 +191,7 @@ def main():
             ticks.append(time.time())
             tick_threads.add(threading.current_thread())
 
-        W.push_transactions_parallel(
+        we_cls.push_transactions_parallel(
             wes, max_workers=1, on_tick=on_tick, tick_interval=0.5
         )
         # ~3s push with 0.5s ticks => at least a few ticks.
@@ -202,7 +202,7 @@ def main():
         )
         print(f"[OK] on_tick fired {len(ticks)} times from the calling thread")
     finally:
-        W.push_transactions_to_willexecutor = orig_push3
+        we_cls.push_transactions_to_willexecutor = orig_push3
 
     # ---- 2d) check_transactions_parallel: parallel + deadline + on_tick ----
     # Pressing "Check" verifies each will-executor still holds its tx.  This used
@@ -214,8 +214,8 @@ def main():
         time.sleep(SLOW)
         return {"tx": "ok"} if "good" in url else None
 
-    orig_check = W.check_transaction
-    W.check_transaction = staticmethod(slow_check)
+    orig_check = we_cls.check_transaction
+    we_cls.check_transaction = staticmethod(slow_check)
     try:
         targets = []
         for i in range(N):
@@ -228,7 +228,7 @@ def main():
             checked.append((wid, res))
 
         start = time.time()
-        results = W.check_transactions_parallel(
+        results = we_cls.check_transactions_parallel(
             targets, on_each=on_each_check, max_workers=N
         )
         elapsed = time.time() - start
@@ -239,7 +239,7 @@ def main():
         print(f"[OK] check parallel: {elapsed:.2f}s for {N} servers "
               f"(sequential would be ~{sequential:.2f}s)")
     finally:
-        W.check_transaction = orig_check
+        we_cls.check_transaction = orig_check
 
     # 2d-bis) global deadline + on_tick from the calling thread
     def hanging_check(txid, url, **kwargs):
@@ -248,8 +248,8 @@ def main():
         time.sleep(10)
         return {"tx": "ok"}
 
-    orig_check2 = W.check_transaction
-    W.check_transaction = staticmethod(hanging_check)
+    orig_check2 = we_cls.check_transaction
+    we_cls.check_transaction = staticmethod(hanging_check)
     try:
         targets = [
             ("idf", "https://fast.example"),
@@ -268,7 +268,7 @@ def main():
             tick_threads.add(threading.current_thread())
 
         start = time.time()
-        W.check_transactions_parallel(
+        we_cls.check_transactions_parallel(
             targets, max_workers=2, deadline=2.0,
             on_timeout=on_timeout_check, on_tick=on_tick_check,
             tick_interval=0.5,
@@ -282,7 +282,7 @@ def main():
         print(f"[OK] check global deadline enforced ({elapsed:.1f}s), on_tick "
               f"fired {len(ticks)}x from the calling thread")
     finally:
-        W.check_transaction = orig_check2
+        we_cls.check_transaction = orig_check2
 
     # ---- 3) the wizard's loop_push must use the parallel helper ----
     # The "Building Will" wizard broadcasts via BalBuildWillDialog.loop_push.

tests/preview_build_will_dialog.py

@@ -17,8 +17,8 @@ import sys
 
 os.environ.setdefault("QT_QPA_PLATFORM", "offscreen")
 
-from PyQt6.QtWidgets import QApplication, QLabel, QWidget, QVBoxLayout
 from PyQt6.QtCore import Qt
+from PyQt6.QtWidgets import QApplication, QLabel, QVBoxLayout, QWidget
 
 # Same colors as BalBuildWillDialog
 COLOR_WARNING = "#cfa808"

tests/preview_building_will_close_btn.py

@@ -17,10 +17,15 @@ import os
 
 os.environ.setdefault("QT_QPA_PLATFORM", "offscreen")
 
-from PyQt6.QtWidgets import (  # noqa: E402
-    QApplication, QWidget, QVBoxLayout, QHBoxLayout, QLabel, QPushButton,
-)
 from PyQt6.QtCore import Qt  # noqa: E402
+from PyQt6.QtWidgets import (  # noqa: E402
+    QApplication,
+    QHBoxLayout,
+    QLabel,
+    QPushButton,
+    QVBoxLayout,
+    QWidget,
+)
 
 COLOR_OK = "#05ad05"
 

tests/preview_we_rows.py

@@ -21,8 +21,8 @@ import sys
 
 os.environ.setdefault("QT_QPA_PLATFORM", "offscreen")
 
-from PyQt6.QtWidgets import QApplication, QLabel, QWidget, QVBoxLayout
 from PyQt6.QtCore import Qt
+from PyQt6.QtWidgets import QApplication, QLabel, QVBoxLayout, QWidget
 
 COLOR_ERROR = "#ff0000"
 COLOR_OK = "#05ad05"

tests/preview_wizard_button.py

@@ -20,12 +20,17 @@ import os
 
 os.environ.setdefault("QT_QPA_PLATFORM", "offscreen")
 
-from PyQt6.QtWidgets import (  # noqa: E402
-    QApplication, QWidget, QHBoxLayout, QPushButton, QComboBox, QLineEdit,
-    QLabel,
-)
+from PyQt6.QtCore import QSize  # noqa: E402
 from PyQt6.QtGui import QIcon, QPixmap  # noqa: E402
-from PyQt6.QtCore import QSize, Qt  # noqa: E402
+from PyQt6.QtWidgets import (  # noqa: E402
+    QApplication,
+    QComboBox,
+    QHBoxLayout,
+    QLabel,
+    QLineEdit,
+    QPushButton,
+    QWidget,
+)
 
 ICON_PATH = os.path.join(os.path.dirname(__file__), "..", "bal", "icons",
                         "wizard.png")

tests/preview_wizard_settings_align.py

@@ -27,12 +27,19 @@ import os
 
 os.environ.setdefault("QT_QPA_PLATFORM", "offscreen")
 
-from PyQt6.QtWidgets import (  # noqa: E402
-    QApplication, QWidget, QVBoxLayout, QHBoxLayout, QToolButton, QComboBox,
-    QLineEdit, QSpinBox, QLabel,
-)
-from PyQt6.QtGui import QFontMetrics  # noqa: E402
 from PyQt6.QtCore import Qt  # noqa: E402
+from PyQt6.QtGui import QFontMetrics  # noqa: E402
+from PyQt6.QtWidgets import (  # noqa: E402
+    QApplication,
+    QComboBox,
+    QHBoxLayout,
+    QLabel,
+    QLineEdit,
+    QSpinBox,
+    QToolButton,
+    QVBoxLayout,
+    QWidget,
+)
 
 
 def _char_w():

tests/sim_update_flows.py

@@ -21,18 +21,21 @@ Run:
     QT_QPA_PLATFORM=offscreen PYTHONPATH=electrum-src python3 tests/sim_update_flows.py
 """
 
-import sys
-import os
 import copy
+import os
+import sys
 
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
 from bal.core.will import (
-    WillItem, Will,
-    NotCompleteWillException, HeirNotFoundException, NoHeirsException,
-    TxFeesChangedException, WillExpiredException,
+    HeirNotFoundException,
+    NoHeirsException,
+    NotCompleteWillException,
+    TxFeesChangedException,
+    Will,
+    WillExpiredException,
+    WillItem,
 )
-from bal.core.util import Util
 
 # A valid serialized tx (1 input + 1 output, version 2). Its nLockTime is 0.
 _VALID_TX_HEX = (

tests/smoke_test.py

@@ -26,30 +26,28 @@ def main():
     from PyQt6.QtWidgets import QApplication  # noqa
     _app = QApplication.instance() or QApplication([])
 
-    results = {}
-
     # 1) Core modules import (these must be GUI-free).
     bal = imp_core("bal", "core.plugin_base")
     util = imp_core("util", "core.util")
     heirs = imp_core("heirs", "core.heirs")
     will = imp_core("will", "core.will")
-    we = imp_core("willexecutors", "core.willexecutors")
+    _we = imp_core("willexecutors", "core.willexecutors")
 
     # 2) GUI module imports.
     qt = imp_gui()
 
     # 3) Behaviour checks (pure logic, must be identical across versions).
-    BalTimestamp = bal.BalTimestamp
-    assert BalTimestamp("30d").duration_to_days() == 30, "BalTimestamp 30d"
-    assert BalTimestamp("1y").duration_to_days() == 365, "BalTimestamp 1y"
-    assert str(BalTimestamp("7d")) == "7d", "BalTimestamp str"
+    bal_timestamp = bal.BalTimestamp
+    assert bal_timestamp("30d").duration_to_days() == 30, "BalTimestamp 30d"
+    assert bal_timestamp("1y").duration_to_days() == 365, "BalTimestamp 1y"
+    assert str(bal_timestamp("7d")) == "7d", "BalTimestamp str"
 
-    Util = util.Util
-    assert Util.is_perc("50%") is True
-    assert Util.is_perc("100") is False
-    assert Util.text_to_hex("BAL") == "42414c"
-    assert Util.hex_to_text("42414c") == "BAL"
-    assert Util.int_locktime(days=1) == 86400
+    util_cls = util.Util
+    assert util_cls.is_perc("50%") is True
+    assert util_cls.is_perc("100") is False
+    assert util_cls.text_to_hex("BAL") == "42414c"
+    assert util_cls.hex_to_text("42414c") == "BAL"
+    assert util_cls.int_locktime(days=1) == 86400
 
     # heirs constants must keep the same column layout (very delicate!)
     assert heirs.HEIR_ADDRESS == 0

tests/test_anticipate_manual_locktime.py

@@ -27,19 +27,19 @@ Run:
         tests/test_anticipate_manual_locktime.py -q
 """
 
-import sys
-import os
 import copy
+import os
+import sys
 
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
 import pytest  # noqa: E402
 
 from bal.core.will import (  # noqa: E402
-    WillItem,
-    Will,
     NotCompleteWillException,
+    Will,
     WillExpiredException,
+    WillItem,
 )
 
 # A valid serialized tx (1 input + 1 output, version 2).

tests/test_anticipate_past_locktime.py

@@ -22,13 +22,13 @@ whether a fix is needed.  Run:
         python3 -m pytest tests/test_anticipate_past_locktime.py -q
 """
 
-import sys
 import os
+import sys
 import time
 
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
-from bal.core.util import Util, LOCKTIME_THRESHOLD
+from bal.core.util import LOCKTIME_THRESHOLD, Util
 
 
 # ---------------------------------------------------------------------------

tests/test_core_heirs.py

@@ -9,25 +9,34 @@ Run:
     python3 tests/test_core_heirs.py
 """
 
-import sys
 import os
+import sys
+
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
 from bal.core.heirs import (
-    HEIR_ADDRESS, HEIR_AMOUNT, HEIR_LOCKTIME, HEIR_REAL_AMOUNT,
-    HEIR_DUST_AMOUNT, TRANSACTION_LABEL,
+    HEIR_ADDRESS,
+    HEIR_AMOUNT,
+    HEIR_DUST_AMOUNT,
+    HEIR_LOCKTIME,
+    HEIR_REAL_AMOUNT,
     OP_RETURN_PREFIX,
-    create_op_return_script,
-    is_op_return_address, get_op_return_hex, validate_op_return_hex,
+    TRANSACTION_LABEL,
     AliasNotFoundException,
-    NotAnAddress, AmountNotValid, LocktimeNotValid,
-    HeirExpiredException, HeirAmountIsDustException,
-    NoHeirsException, WillExecutorFeeException,
+    AmountNotValid,
     BalanceTooLowException,
+    HeirAmountIsDustException,
     Heirs,
+    LocktimeNotValid,
+    NoHeirsException,
+    NotAnAddress,
+    WillExecutorFeeException,
+    create_op_return_script,
+    get_op_return_hex,
+    is_op_return_address,
+    validate_op_return_hex,
 )
 
-
 # ------------------------------------------------------------------ #
 # Constants
 # ------------------------------------------------------------------ #
@@ -70,7 +79,7 @@ def test_op_return_empty():
 def test_op_return_too_big():
     try:
         create_op_return_script("ab" * 81)  # 81 bytes > max 80
-        assert False, "expected ValueError"
+        raise AssertionError("expected ValueError")
     except ValueError:
         pass
 
@@ -179,13 +188,13 @@ def test_validate_amount():
     # Invalid
     try:
         Heirs.validate_amount("0.000000001")
-        assert False, "expected AmountNotValid"
+        raise AssertionError("expected AmountNotValid")
     except AmountNotValid:
         pass
 
     try:
         Heirs.validate_amount("-1")
-        assert False, "expected AmountNotValid"
+        raise AssertionError("expected AmountNotValid")
     except AmountNotValid:
         pass
 
@@ -209,7 +218,7 @@ def test_validate_locktime_expired():
     past = int(time.time()) - 86400  # yesterday
     try:
         Heirs.validate_locktime(str(past), timestamp_to_check=past + 1)
-        assert False, "expected LocktimeNotValid"
+        raise AssertionError("expected LocktimeNotValid")
     except LocktimeNotValid:
         pass
 
@@ -289,7 +298,7 @@ def test_validate_op_return_hex_valid():
 def test_validate_op_return_hex_invalid():
     try:
         validate_op_return_hex("nothex!!")
-        assert False, "expected NotAnAddress"
+        raise AssertionError("expected NotAnAddress")
     except NotAnAddress:
         pass
 
@@ -297,7 +306,7 @@ def test_validate_op_return_hex_invalid():
 def test_validate_op_return_hex_too_long():
     try:
         validate_op_return_hex("ab" * 81)
-        assert False, "expected NotAnAddress"
+        raise AssertionError("expected NotAnAddress")
     except NotAnAddress:
         pass
 
@@ -355,4 +364,4 @@ if __name__ == "__main__":
         if name.startswith("test_"):
             globals()[name]()
             print(f"  [OK] {name}")
-    print(f"[OK] All heirs tests passed")
+    print("[OK] All heirs tests passed")

tests/test_core_heirs_extra.py

@@ -8,19 +8,20 @@ Run:
     QT_QPA_PLATFORM=offscreen python3 tests/test_core_heirs_extra.py
 """
 
-import sys
 import os
+import sys
 from unittest.mock import MagicMock, patch
 
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
 from bal.core.heirs import (
-    Heirs, create_op_return_script, reduce_outputs,
-    HEIR_ADDRESS, HEIR_AMOUNT, HEIR_LOCKTIME, HEIR_REAL_AMOUNT,
+    HEIR_AMOUNT,
+    Heirs,
+    create_op_return_script,
+    reduce_outputs,
 )
 from bal.core.willexecutors import Willexecutors
 
-
 # ------------------------------------------------------------------ #
 # Heirs db-dependent methods
 # ------------------------------------------------------------------ #
@@ -188,7 +189,7 @@ def test_validate_address_invalid():
         from bal.core.heirs import NotAnAddress
         try:
             Heirs.validate_address("bad")
-            assert False, "should have raised"
+            raise AssertionError("should have raised")
         except NotAnAddress:
             pass
 

tests/test_core_plugin_base.py

@@ -8,14 +8,15 @@ Run:
     python3 tests/test_core_plugin_base.py
 """
 
-import sys
 import os
+import sys
 import time
+
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
-from datetime import datetime, date, timedelta
-from bal.core.plugin_base import BalTimestamp, BalPlugin, BalConfig
+from datetime import date, datetime, timedelta
 
+from bal.core.plugin_base import BalConfig, BalPlugin, BalTimestamp
 
 # ------------------------------------------------------------------ #
 # BalTimestamp

tests/test_core_util.py

@@ -9,13 +9,14 @@ Run:
     python3 tests/test_core_util.py
 """
 
-import sys
 import os
+import sys
+
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
 import pytest
 
-from bal.core.util import Util, LOCKTIME_THRESHOLD
+from bal.core.util import Util
 
 
 def test_locktime_to_str():
@@ -40,7 +41,7 @@ def test_str_to_locktime():
 
     # the block-height suffix "b" was removed (A1): "144b" is no longer a valid
     # relative locktime, so it is NOT passed through unchanged.
-    with pytest.raises(Exception):
+    with pytest.raises(ValueError):
         Util.str_to_locktime("144b")
 
     # integer string -> int
@@ -347,44 +348,44 @@ def test_in_utxo():
 
 
 def test_cmp_output():
-    class O:
+    class Obj:
         def __init__(self, addr, val):
             self.address = addr
             self.value = val
-    assert Util.cmp_output(O("a", 100), O("a", 100)) is True
-    assert Util.cmp_output(O("a", 100), O("b", 100)) is False
-    assert Util.cmp_output(O("a", 100), O("a", 200)) is False
+    assert Util.cmp_output(Obj("a", 100), Obj("a", 100)) is True
+    assert Util.cmp_output(Obj("a", 100), Obj("b", 100)) is False
+    assert Util.cmp_output(Obj("a", 100), Obj("a", 200)) is False
 
 
 def test_in_output():
-    class O:
+    class Obj:
         def __init__(self, addr, val):
             self.address = addr
             self.value = val
-    outputs = [O("a", 100), O("b", 200)]
-    assert Util.in_output(O("a", 100), outputs) is True
-    assert Util.in_output(O("z", 999), outputs) is False
-    assert Util.in_output(O("a", 100), []) is False
+    outputs = [Obj("a", 100), Obj("b", 200)]
+    assert Util.in_output(Obj("a", 100), outputs) is True
+    assert Util.in_output(Obj("z", 999), outputs) is False
+    assert Util.in_output(Obj("a", 100), []) is False
 
 
 def test_din_output():
-    class O:
+    class Obj:
         def __init__(self, addr, val):
             self.address = addr
             self.value = val
 
-    outputs = [O("a", 100), O("b", 200)]
+    outputs = [Obj("a", 100), Obj("b", 200)]
 
     # same amount AND same address
-    same_amt, same_addr = Util.din_output(O("a", 100), outputs)
+    same_amt, same_addr = Util.din_output(Obj("a", 100), outputs)
     assert same_amt is True and same_addr is True
 
     # same amount but different address
-    same_amt, same_addr = Util.din_output(O("c", 100), outputs)
+    same_amt, same_addr = Util.din_output(Obj("c", 100), outputs)
     assert same_amt is True and same_addr is False
 
     # different amount
-    same_amt, same_addr = Util.din_output(O("z", 999), outputs)
+    same_amt, same_addr = Util.din_output(Obj("z", 999), outputs)
     assert same_amt is False and same_addr is False
 
 

tests/test_core_will.py

@@ -8,13 +8,13 @@ Run:
     python3 tests/test_core_will.py
 """
 
-import sys
-import os
 import copy
+import os
+import sys
+
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
-from bal.core.will import WillItem, Will
-from bal.core.willexecutors import Willexecutors
+from bal.core.will import Will, WillItem
 
 # A valid serialized Bitcoin transaction hex (1 input + 1 P2PKH output, version 2)
 _VALID_TX_HEX = (
@@ -332,11 +332,19 @@ def test_will_check_tx_height():
 
 def test_exceptions():
     from bal.core.will import (
-        WillException, WillExpiredException, NotCompleteWillException,
-        HeirChangeException, TxFeesChangedException, HeirNotFoundException,
-        WillexecutorChangeException, NoWillExecutorNotPresent,
-        WillExecutorNotPresent, NoHeirsException,
-        AmountException, PercAmountException, FixedAmountException,
+        AmountException,
+        FixedAmountException,
+        HeirChangeException,
+        HeirNotFoundException,
+        NoHeirsException,
+        NotCompleteWillException,
+        NoWillExecutorNotPresent,
+        PercAmountException,
+        TxFeesChangedException,
+        WillException,
+        WillexecutorChangeException,
+        WillExecutorNotPresent,
+        WillExpiredException,
         WillPostponedException,
     )
 
@@ -375,4 +383,4 @@ if __name__ == "__main__":
         if name.startswith("test_"):
             globals()[name]()
             print(f"  [OK] {name}")
-    print(f"[OK] All Will tests passed")
+    print("[OK] All Will tests passed")

tests/test_core_will_extra.py

@@ -8,15 +8,16 @@ Run:
     QT_QPA_PLATFORM=offscreen python3 tests/test_core_will_extra.py
 """
 
-import sys
 import os
-from unittest.mock import MagicMock, patch, PropertyMock, call
+import sys
+from unittest.mock import MagicMock, patch
 
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
-from bal.core.will import Will, WillItem
 from electrum.transaction import Transaction
 
+from bal.core.will import Will, WillItem
+
 _VALID_TX_HEX = (
     "01000000012a5c9a94fcde98f5581cd00162c60a13936ceb75389ea65b"
     "f38633b424eb4031000000006c493046022100a82bbc57a0136751e543"

tests/test_core_will_invalidate.py

@@ -22,15 +22,14 @@ import os
 import sys
 from unittest.mock import MagicMock, patch
 
-import pytest
-
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
-from bal.core.will import Will, WillItem
-
 # Patch Transaction.add_info_from_wallet so WillItem can parse the tx hex
 # without a live Electrum wallet connection.
 from electrum.transaction import Transaction
+
+from bal.core.will import Will, WillItem
+
 _patcher = patch.object(Transaction, "add_info_from_wallet")
 _patcher.start()
 

tests/test_group_b_auto_sign.py

@@ -28,7 +28,6 @@ sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 from bal.core.plugin_base import BalConfig
 from bal.core.willexecutors import Willexecutors
 
-
 # ------------------------------------------------------------------ #
 # Mocks
 # ------------------------------------------------------------------ #

tests/test_group_c_settings.py

@@ -27,7 +27,6 @@ sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
 from bal.core.plugin_base import BalConfig
 
-
 # ------------------------------------------------------------------ #
 # Mocks
 # ------------------------------------------------------------------ #

tests/test_group_d_alarms.py

@@ -27,7 +27,6 @@ sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 from bal.core.plugin_base import BalConfig
 from bal.gui.qt.widgets import compute_reminder_offsets
 
-
 # ------------------------------------------------------------------ #
 # Mocks
 # ------------------------------------------------------------------ #

tests/test_group_e_karen7_invalidate.py

@@ -25,7 +25,6 @@ import copy
 import json
 import os
 import sys
-import warnings
 
 import pytest
 
@@ -42,15 +41,12 @@ from electrum import bitcoin
 from electrum.transaction import (
     PartialTransaction,
     PartialTxInput,
-    PartialTxOutput,
     TxOutpoint,
 )
 from electrum.util import bfh
 
 from bal.core.heirs import Heirs
 from bal.core.will import Will, WillItem
-from bal.core.willexecutors import Willexecutors
-
 
 # ------------------------------------------------------------------ #
 # Load karen7 wallet data
@@ -166,7 +162,7 @@ def _build_utxo_value_map(data):
     for txid, outputs in txo.items():
         if not isinstance(outputs, dict):
             continue
-        for addr, out_map in outputs.items():
+        for _, out_map in outputs.items():
             if not isinstance(out_map, dict):
                 continue
             for idx, info in out_map.items():
@@ -188,7 +184,7 @@ def _populate_input_values(will, utxo_value_map):
     This is the equivalent of what ``add_info_from_wallet`` does in the
     real flow: looking up the UTXO value and attaching it to the input.
     """
-    for wid, wi in will.items():
+    for _, wi in will.items():
         for txin in wi.tx.inputs():
             prevout_str = txin.prevout.to_str()
             if txin._trusted_value_sats is None and prevout_str in utxo_value_map:

tests/test_group_e_mock_karen7.py

@@ -36,13 +36,12 @@ import pytest
 # below the repo root that contains the ``bal`` package).
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
-from bal.core.will import WillItem, Will, HeirNotFoundException
 from bal.core.heirs import Heirs
+from bal.core.will import HeirNotFoundException, Will, WillItem
 from bal.core.willexecutors import Willexecutors
 from bal.gui.qt.calendar import BalCalendar
 from bal.gui.qt.widgets import compute_reminder_offsets
 
-
 # A valid serialized Bitcoin transaction hex (1 input + 1 P2PKH output,
 # version 2).  Reused from test_core_will.py so WillItem can parse a real tx.
 _VALID_TX_HEX = (
@@ -550,7 +549,7 @@ def test_e5_build_with_real_wallet_heirs_and_utxos():
     for txid, outputs in txo.items():
         if not isinstance(outputs, dict):
             continue
-        for addr, out_map in outputs.items():
+        for _, out_map in outputs.items():
             if not isinstance(out_map, dict):
                 continue
             for idx, info in out_map.items():

tests/test_group_f_heir_change_rebuild.py

@@ -16,8 +16,9 @@ Run:
     python3 tests/test_group_f_heir_change_rebuild.py
 """
 
-import sys
 import os
+import sys
+
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
 from bal.core.will import Will

tests/test_group_g_basic_calendar.py

@@ -24,8 +24,7 @@ import sys
 
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
-from bal.gui.qt.widgets import (BASIC_REMINDER_OFFSETS,
-                                 basic_reminder_offsets)
+from bal.gui.qt.widgets import BASIC_REMINDER_OFFSETS, basic_reminder_offsets
 
 
 def test_basic_offsets_all_future():

tests/test_group_i_basic_checkalive.py

@@ -32,7 +32,6 @@ sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))
 
 from bal.gui.qt.window import BalWindow  # noqa: E402  (path insert above)
 
-
 OFFSET = BalWindow.BASIC_MODE_CHECK_ALIVE_OFFSET_SECONDS
 
 

tests/test_gui_calendar.py

@@ -10,14 +10,12 @@ Run:
 
 import os
 import sys
-import tempfile
 from datetime import datetime, timezone
 
 sys.path.insert(0, __file__.rsplit("/", 2)[0])
 
 from bal.gui.qt.calendar import BalCalendar
 
-
 # ------------------------------------------------------------------ #
 # format_time
 # ------------------------------------------------------------------ #

tests/test_gui_common.py

@@ -8,12 +8,13 @@ Run:
 """
 
 import sys
+
 sys.path.insert(0, __file__.rsplit("/", 2)[0])
 
-from PyQt6.QtWidgets import QApplication, QGridLayout, QLabel, QWidget
+from PyQt6.QtWidgets import QApplication, QGridLayout, QLabel
 
 # Import the module itself, not via "from .common import *"
-import bal.gui.qt.common as C
+import bal.gui.qt.common as common
 
 _app = QApplication.instance() or QApplication(sys.argv)
 
@@ -23,18 +24,18 @@ _app = QApplication.instance() or QApplication(sys.argv)
 # ------------------------------------------------------------------ #
 
 def test_shown_cv_default():
-    cv = C.shown_cv(True)
+    cv = common.shown_cv(True)
     assert cv.get() is True
 
 
 def test_shown_cv_set():
-    cv = C.shown_cv(True)
+    cv = common.shown_cv(True)
     cv.set(False)
     assert cv.get() is False
 
 
 def test_shown_cv_roundtrip():
-    cv = C.shown_cv(False)
+    cv = common.shown_cv(False)
     assert cv.get() is False
     cv.set(True)
     assert cv.get() is True
@@ -47,19 +48,19 @@ def test_shown_cv_roundtrip():
 # ------------------------------------------------------------------ #
 
 def test_check_alive_error_default():
-    err = C.CheckAliveError(1000000)
+    err = common.CheckAliveError(1000000)
     assert err.timestamp_to_check == 1000000
 
 
 def test_check_alive_error_str():
-    err = C.CheckAliveError(1000000)
+    err = common.CheckAliveError(1000000)
     s = str(err)
     assert "Check alive expired" in s
     assert "1970" in s
 
 
 def test_check_alive_error_subclass():
-    assert issubclass(C.CheckAliveError, Exception)
+    assert issubclass(common.CheckAliveError, Exception)
 
 
 # ------------------------------------------------------------------ #
@@ -68,17 +69,15 @@ def test_check_alive_error_subclass():
 
 def test_add_widget():
     grid = QGridLayout()
-    parent = QWidget()
     label = QLabel("test")
-    C.add_widget(grid, "Label", label, 0, "Help text")
+    common.add_widget(grid, "Label", label, 0, "Help text")
     assert grid.count() == 3  # label + widget + help button
 
 
 def test_add_widget_multiple_rows():
     grid = QGridLayout()
-    parent = QWidget()
-    C.add_widget(grid, "A", QLabel("a"), 0, "help_a")
-    C.add_widget(grid, "B", QLabel("b"), 1, "help_b")
+    common.add_widget(grid, "A", QLabel("a"), 0, "help_a")
+    common.add_widget(grid, "B", QLabel("b"), 1, "help_b")
     assert grid.count() == 6
 
 
@@ -87,7 +86,7 @@ def test_add_widget_multiple_rows():
 # ------------------------------------------------------------------ #
 
 def test_log_error_no_window():
-    C.log_error((Exception, Exception("test"), None))
+    common.log_error((Exception, Exception("test"), None))
 
 
 # ------------------------------------------------------------------ #

tests/test_gui_theme.py

@@ -8,11 +8,11 @@ Run:
 """
 
 import sys
+
 sys.path.insert(0, __file__.rsplit("/", 2)[0])
 
 from bal.gui.qt.theme import status_color
 
-
 # ------------------------------------------------------------------ #
 # Helpers
 # ------------------------------------------------------------------ #

tests/test_gui_widgets.py

@@ -13,13 +13,11 @@ Run:
 """
 
 import sys
+
 sys.path.insert(0, __file__.rsplit("/", 2)[0])
 
-from PyQt6.QtCore import QTimer
 from PyQt6.QtWidgets import QApplication, QWidget
 
-from electrum.util import DECIMAL_POINT, decimal_point_to_base_unit_name
-
 _app = QApplication.instance() or QApplication(sys.argv)
 
 

tests/test_gui_window_utils.py

@@ -8,13 +8,18 @@ Run:
 """
 
 import sys
+
 sys.path.insert(0, __file__.rsplit("/", 2)[0])
 
 from PyQt6.QtCore import QTimer
 from PyQt6.QtWidgets import QApplication, QDialog, QWidget
 
 from bal.gui.qt.window_utils import (
-    bring_to_front, show_modal, show_on_top, stop_thread, top_level_of,
+    bring_to_front,
+    show_modal,
+    show_on_top,
+    stop_thread,
+    top_level_of,
 )
 
 _app = QApplication.instance() or QApplication(sys.argv)

tests/test_no_willexecutor_karen7.py

@@ -33,10 +33,9 @@ import logging
 import os
 import sys
 import time
-from unittest.mock import MagicMock, patch
+from unittest.mock import patch
 
 import pytest
-
 from electrum import constants
 
 constants.net = constants.BitcoinRegtest
@@ -48,10 +47,14 @@ from electrum.transaction import PartialTxInput, TxOutpoint
 from electrum.util import bfh
 
 from bal.core.heirs import Heirs
-from bal.core.will import Will, WillItem, NoWillExecutorNotPresent, NotCompleteWillException
+from bal.core.will import (
+    NotCompleteWillException,
+    NoWillExecutorNotPresent,
+    Will,
+    WillItem,
+)
 from bal.core.willexecutors import Willexecutors
 
-
 # ------------------------------------------------------------------ #
 # Load karen7 wallet data
 # ------------------------------------------------------------------ #
@@ -479,11 +482,11 @@ class TestNoWillexecutorKaren7:
         dialog = FakeBuildWillDialog(self.bal_window)
         dialog.task_phase1()
         assert any(
-            "Not present - select one or enable backup mode" in l
-            for l in dialog.labels
+            "Not present - select one or enable backup mode" in label
+            for label in dialog.labels
         ), "dialog labels must contain the 'not present' message"
         assert any(
-            "#ff0000" in l for l in dialog.labels
+            "#ff0000" in label for label in dialog.labels
         ), "dialog labels must use red (COLOR_ERROR)"
 
     def test_task_phase1_adds_action_buttons(self):

tests/test_reproduce_none_type.py

@@ -23,9 +23,15 @@ if os.path.isdir(ELECTRUM_DIR):
     sys.path.insert(0, ELECTRUM_DIR)
 
 from bal.core.heirs import Heirs
-from bal.core.willexecutors import Willexecutors
-from bal.core.will import Will, WillItem, NotCompleteWillException, NoHeirsException, NoWillExecutorNotPresent
 from bal.core.plugin_base import BalPlugin, BalTimestamp
+from bal.core.will import (
+    NoHeirsException,
+    NotCompleteWillException,
+    NoWillExecutorNotPresent,
+    Will,
+    WillItem,
+)
+from bal.core.willexecutors import Willexecutors
 
 # ------------------------------------------------------------------ #
 # Load karen7 wallet data
@@ -53,7 +59,7 @@ def build_utxos(data):
     for txid, outputs in txo.items():
         if not isinstance(outputs, dict):
             continue
-        for addr, out_map in outputs.items():
+        for _, out_map in outputs.items():
             if not isinstance(out_map, dict):
                 continue
             for idx, info in out_map.items():
@@ -85,7 +91,6 @@ class FakeBalWindow:
     def init_class_variables(self):
         if not self.heirs:
             raise NoHeirsException("Heirs are not defined")
-        from bal.core.plugin_base import BalTimestamp
         from datetime import datetime
         self.date_to_check = BalTimestamp(self.will_settings['threshold']).to_timestamp()
         self.no_willexecutor = self.bal_plugin.NO_WILLEXECUTOR.get()

tests/windows_overflow_test.py

@@ -45,10 +45,10 @@ class _WindowsLikeDatetime(_real_datetime):
 
 def main():
     plugin_base = importlib.import_module(f"{PKG}.core.plugin_base")
-    BalTimestamp = plugin_base.BalTimestamp
+    bt_class = plugin_base.BalTimestamp
 
     # 1) Sanity: with the real (Linux 64-bit) datetime, large ts works already.
-    bt = BalTimestamp(NLOCKTIME_MAX)
+    bt = bt_class(NLOCKTIME_MAX)
     d = bt.to_date()
     assert isinstance(d, _real_datetime), d
     print("[OK] BalTimestamp(NLOCKTIME_MAX).to_date() works on this platform")
@@ -59,7 +59,7 @@ def main():
     plugin_base.datetime = _WindowsLikeDatetime
     try:
         # 2a) Absolute sentinel timestamp (the exact crash path from the log).
-        bt = BalTimestamp(NLOCKTIME_MAX)
+        bt = bt_class(NLOCKTIME_MAX)
         d = bt.to_date()  # must NOT raise OverflowError anymore
         assert d.year <= 2038, f"expected clamp to <=2038, got {d!r}"
         print("[OK] to_date(NLOCKTIME_MAX) no longer raises (clamped to INT32_MAX)")
@@ -75,13 +75,13 @@ def main():
         print("[OK] str()/repr() on out-of-range timestamp are safe")
 
         # 2d) Relative durations that overflow when added (e.g. huge 'd').
-        bt_rel = BalTimestamp(f"{10 ** 9}d")  # ~2.7M years -> overflow
+        bt_rel = bt_class(f"{10 ** 9}d")  # ~2.7M years -> overflow
         d2 = bt_rel.to_date()
         assert d2 is not None
         print("[OK] huge relative duration no longer raises")
 
         # 2e) Normal values are unchanged (behaviour-preserving check).
-        bt_norm = BalTimestamp("90d")
+        bt_norm = bt_class("90d")
         d3 = bt_norm.to_date()
         # 90 days from now, normalised to midnight
         assert d3.hour == 0 and d3.minute == 0 and d3.second == 0