style(core/src): use new syntax for typing

core/src/protobuf.py

@@ -212,7 +212,7 @@ def load_message(
         raise ValueError  # experimental messages not enabled
 
     # we need to avoid calling __init__, which enforces required arguments
-    msg = object.__new__(msg_type)  # type: LoadedMessageType
+    msg: LoadedMessageType = object.__new__(msg_type)
     # pre-seed the object with defaults
     for fname, _, fdefault in fields.values():
         if fdefault is FLAG_REPEATED:
@@ -224,7 +224,7 @@ def load_message(
     if False:
         SingularValue = Union[int, bool, bytearray, str, MessageType]
         Value = Union[SingularValue, List[SingularValue]]
-        fvalue = 0  # type: Value
+        fvalue: Value = 0
 
     while True:
         try:

core/src/storage/cache.py

@@ -2,7 +2,7 @@ from trezor import wire
 from trezor.crypto import random
 
 if False:
-    from typing import Optional, Dict, List
+    from typing import Optional, Dict, List, Any
 
 _MAX_SESSIONS_COUNT = 10
 _SESSIONLESS_FLAG = 128
@@ -18,10 +18,10 @@ APP_COMMON_SEED_WITHOUT_PASSPHRASE = 1 | _SESSIONLESS_FLAG
 APP_COMMON_SAFETY_CHECKS_TEMPORARY = 2 | _SESSIONLESS_FLAG
 
 
-_active_session_id = None  # type: Optional[bytes]
-_caches = {}  # type: Dict[bytes, Dict[int, Any]]
-_session_ids = []  # type: List[bytes]
-_sessionless_cache = {}  # type: Dict[int, Any]
+_active_session_id: Optional[bytes] = None
+_caches: Dict[bytes, Dict[int, Any]] = {}
+_session_ids: List[bytes] = []
+_sessionless_cache: Dict[int, Any] = {}
 
 if False:
     from typing import Any, Callable, TypeVar

core/src/storage/device.py

@@ -40,8 +40,8 @@ _EXPERIMENTAL_FEATURES     = const(0x15)  # bool (0x01 or empty)
 
 _DEFAULT_BACKUP_TYPE       = BackupType.Bip39
 
-SAFETY_CHECK_LEVEL_STRICT   = const(0)  # type: Literal[0]
-SAFETY_CHECK_LEVEL_PROMPT   = const(1)  # type: Literal[1]
+SAFETY_CHECK_LEVEL_STRICT  : Literal[0] = const(0)
+SAFETY_CHECK_LEVEL_PROMPT  : Literal[1] = const(1)
 _DEFAULT_SAFETY_CHECK_LEVEL = SAFETY_CHECK_LEVEL_STRICT
 if False:
     StorageSafetyCheckLevel = Literal[0, 1]

core/src/trezor/crypto/slip39.py

@@ -229,7 +229,7 @@ def split_ems(
     # Split the Encrypted Master Secret on the group level.
     group_shares = _split_secret(group_threshold, len(groups), encrypted_master_secret)
 
-    mnemonics = []  # type: List[List[str]]
+    mnemonics: List[List[str]] = []
     for (member_threshold, member_count), (group_index, group_secret) in zip(
         groups, group_shares
     ):
@@ -599,7 +599,7 @@ def _decode_mnemonics(
     group_counts = set()
 
     # { group_index : [threshold, set_of_member_shares] }
-    groups = {}  # type: MnemonicGroups
+    groups: MnemonicGroups = {}
     for mnemonic in mnemonics:
         share = decode_mnemonic(mnemonic)
         identifiers.add(share.identifier)

core/src/trezor/loop.py

@@ -30,23 +30,23 @@ if False:
     Finalizer = Callable[[Task, Any], None]
 
 # function to call after every task step
-after_step_hook = None  # type: Optional[Callable[[], None]]
+after_step_hook: Optional[Callable[[], None]] = None
 
 # tasks scheduled for execution in the future
 _queue = utimeq.utimeq(64)
 
 # tasks paused on I/O
-_paused = {}  # type: Dict[int, Set[Task]]
+_paused: Dict[int, Set[Task]] = {}
 
 # functions to execute after a task is finished
-_finalizers = {}  # type: Dict[int, Finalizer]
+_finalizers: Dict[int, Finalizer] = {}
 
 # reference to the task that is currently executing
-this_task = None  # type: Optional[Task]
+this_task: Optional[Task] = None
 
 if __debug__:
     # synthetic event queue
-    synthetic_events = []  # type: List[Tuple[int, Any]]
+    synthetic_events: List[Tuple[int, Any]] = []
 
 
 class TaskClosed(Exception):
@@ -300,8 +300,8 @@ class race(Syscall):
     def __init__(self, *children: Awaitable, exit_others: bool = True) -> None:
         self.children = children
         self.exit_others = exit_others
-        self.finished = []  # type: List[Awaitable]  # children that finished
-        self.scheduled = []  # type: List[Task]  # scheduled wrapper tasks
+        self.finished: List[Awaitable] = []  # children that finished
+        self.scheduled: List[Task] = []  # scheduled wrapper tasks
 
     def handle(self, task: Task) -> None:
         """
@@ -387,7 +387,7 @@ class chan:
         def __init__(self, ch: "chan", value: Any) -> None:
             self.ch = ch
             self.value = value
-            self.task = None  # type: Optional[Task]
+            self.task: Optional[Task] = None
 
         def handle(self, task: Task) -> None:
             self.task = task
@@ -396,15 +396,15 @@ class chan:
     class Take(Syscall):
         def __init__(self, ch: "chan") -> None:
             self.ch = ch
-            self.task = None  # type: Optional[Task]
+            self.task: Optional[Task] = None
 
         def handle(self, task: Task) -> None:
             self.task = task
             self.ch._schedule_take(task)
 
     def __init__(self) -> None:
-        self.putters = []  # type: List[Tuple[Optional[Task], Any]]
-        self.takers = []  # type: List[Task]
+        self.putters: List[Tuple[Optional[Task], Any]] = []
+        self.takers: List[Task] = []
 
     def put(self, value: Any) -> Awaitable[None]:  # type: ignore
         put = chan.Put(self, value)
@@ -484,10 +484,10 @@ class spawn(Syscall):
 
     def __init__(self, task: Task) -> None:
         self.task = task
-        self.callback = None  # type: Optional[Task]
-        self.finalizer_callback = None  # type: Optional[Callable[["spawn"], None]]
+        self.callback: Optional[Task] = None
+        self.finalizer_callback: Optional[Callable[["spawn"], None]] = None
         self.finished = False
-        self.return_value = None  # type: Any
+        self.return_value: Any = None
 
         # schedule task immediately
         if __debug__:

core/src/trezor/pin.py

@@ -8,9 +8,9 @@ def pin_to_int(pin: str) -> int:
     return int("1" + pin)
 
 
-_previous_progress = None  # type: Optional[int]
-_previous_seconds = None  # type: Optional[int]
-keepalive_callback = None  # type: Any
+_previous_progress: Optional[int] = None
+_previous_seconds: Optional[int] = None
+keepalive_callback: Any = None
 
 
 def show_pin_timeout(seconds: int, progress: int, message: str) -> bool:

core/src/trezor/ui/__init__.py

@@ -308,7 +308,7 @@ class Layout(Component):
     """
 
     BACKLIGHT_LEVEL = style.BACKLIGHT_NORMAL
-    RENDER_SLEEP = loop.sleep(_RENDER_DELAY_MS)  # type: loop.Syscall
+    RENDER_SLEEP: loop.Syscall = loop.sleep(_RENDER_DELAY_MS)
 
     async def __iter__(self) -> ResultValue:
         """

core/src/trezor/ui/checklist.py

@@ -18,7 +18,7 @@ class Checklist(ui.Component):
         super().__init__()
         self.title = title
         self.icon = icon
-        self.items = []  # type: List[ChecklistItem]
+        self.items: List[ChecklistItem] = []
         self.active = 0
 
     def add(self, item: ChecklistItem) -> None:

core/src/trezor/ui/confirm.py

@@ -48,9 +48,7 @@ class Confirm(ui.Layout):
                 area = ui.grid(13, cells_x=2)
             else:
                 area = ui.grid(9, n_x=2)
-            self.confirm = Button(
-                area, confirm, confirm_style
-            )  # type: Optional[Button]
+            self.confirm: Optional[Button] = Button(area, confirm, confirm_style)
             self.confirm.on_click = self.on_confirm  # type: ignore
         else:
             self.confirm = None
@@ -62,7 +60,7 @@ class Confirm(ui.Layout):
                 area = ui.grid(12, cells_x=1)
             else:
                 area = ui.grid(8, n_x=2)
-            self.cancel = Button(area, cancel, cancel_style)  # type: Optional[Button]
+            self.cancel: Optional[Button] = Button(area, cancel, cancel_style)
             self.cancel.on_click = self.on_cancel  # type: ignore
         else:
             self.cancel = None

core/src/trezor/ui/loader.py

@@ -12,8 +12,8 @@ class LoaderDefault:
     class normal:
         bg_color = ui.BG
         fg_color = ui.GREEN
-        icon = None  # type: Optional[str]
-        icon_fg_color = None  # type: Optional[int]
+        icon: Optional[str] = None
+        icon_fg_color: Optional[int] = None
 
     class active(normal):
         bg_color = ui.BG
@@ -43,8 +43,8 @@ class Loader(ui.Component):
         self.normal_style = style.normal
         self.active_style = style.active
         self.target_ms = _TARGET_MS
-        self.start_ms = None  # type: Optional[int]
-        self.stop_ms = None  # type: Optional[int]
+        self.start_ms: Optional[int] = None
+        self.stop_ms: Optional[int] = None
 
     def start(self) -> None:
         self.start_ms = utime.ticks_ms()

core/src/trezor/ui/passphrase.py

@@ -145,7 +145,7 @@ class PassphraseKeyboard(ui.Layout):
         self.done.on_click = self.on_confirm  # type: ignore
 
         self.keys = key_buttons(KEYBOARD_KEYS[self.page], self)
-        self.pending_button = None  # type: Optional[KeyButton]
+        self.pending_button: Optional[KeyButton] = None
         self.pending_index = 0
 
     def dispatch(self, event: int, x: int, y: int) -> None:
@@ -246,11 +246,11 @@ class PassphraseKeyboard(ui.Layout):
         raise ui.Result(self.input.text)
 
     def create_tasks(self) -> Tuple[loop.Task, ...]:
-        tasks = (
+        tasks: Tuple[loop.Task, ...] = (
             self.handle_input(),
             self.handle_rendering(),
             self.handle_paging(),
-        )  # type: Tuple[loop.Task, ...]
+        )
 
         if __debug__:
             from apps.debug import input_signal

core/src/trezor/ui/scroll.py

@@ -98,11 +98,11 @@ class Paginated(ui.Layout):
         self.on_change()
 
     def create_tasks(self) -> Tuple[loop.Task, ...]:
-        tasks = (
+        tasks: Tuple[loop.Task, ...] = (
             self.handle_input(),
             self.handle_rendering(),
             self.handle_paging(),
-        )  # type: Tuple[loop.Task, ...]
+        )
 
         if __debug__:
             # XXX This isn't strictly correct, as it allows *any* Paginated layout to be

core/src/trezor/ui/text.py

@@ -135,7 +135,7 @@ class Text(ui.Component):
         self.icon_color = icon_color
         self.max_lines = max_lines
         self.new_lines = new_lines
-        self.content = []  # type: List[TextContent]
+        self.content: List[TextContent] = []
 
     def normal(self, *content: TextContent) -> None:
         self.content.append(ui.NORMAL)

core/src/trezor/wire/__init__.py

@@ -67,14 +67,14 @@ if False:
 
 
 # Maps a wire type directly to a handler.
-workflow_handlers = {}  # type: Dict[int, Handler]
+workflow_handlers: Dict[int, Handler] = {}
 
 # Maps a wire type to a tuple of package and module.  This allows handlers
 # to be dynamically imported when such message arrives.
-workflow_packages = {}  # type: Dict[int, Tuple[str, str]]
+workflow_packages: Dict[int, Tuple[str, str]] = {}
 
 # If set to False protobuf messages marked with "unstable" option are rejected.
-experimental_enabled = False  # type: bool
+experimental_enabled: bool = False
 
 
 def add(wire_type: int, pkgname: str, modname: str) -> None:
@@ -163,7 +163,7 @@ class Context:
         self.buffer_reader = utils.BufferReader(self.buffer)
         self.buffer_writer = utils.BufferWriter(self.buffer)
 
-        self._field_cache = {}  # type: protobuf.FieldCache
+        self._field_cache: protobuf.FieldCache = {}
 
     async def call(
         self,
@@ -307,8 +307,8 @@ async def handle_session(
     iface: WireInterface, session_id: int, use_workflow: bool = True
 ) -> None:
     ctx = Context(iface, session_id)
-    next_msg = None  # type: Optional[codec_v1.Message]
-    res_msg = None  # type: Optional[protobuf.MessageType]
+    next_msg: Optional[codec_v1.Message] = None
+    res_msg: Optional[protobuf.MessageType] = None
     req_type = None
     req_msg = None
     while True:
@@ -361,7 +361,7 @@ async def handle_session(
                 # We found a valid handler for this message type.
 
                 # Workflow task, declared for the finally block
-                wf_task = None  # type: Optional[HandlerTask]
+                wf_task: Optional[HandlerTask] = None
 
                 # Here we make sure we always respond with a Failure response
                 # in case of any errors.

core/src/trezor/wire/codec_v1.py

@@ -44,7 +44,7 @@ async def read_message(iface: WireInterface, buffer: utils.BufferType) -> Messag
     if msize > len(buffer):
         # allocate a new buffer to fit the message
         try:
-            mdata = bytearray(msize)  # type: utils.BufferType
+            mdata: utils.BufferType = bytearray(msize)
         except MemoryError:
             mdata = bytearray(_REP_LEN)
             read_and_throw_away = True

core/src/trezor/workflow.py

@@ -16,14 +16,14 @@ if __debug__:
 
 
 # Set of workflow tasks.  Multiple workflows can be running at the same time.
-tasks = set()  # type: Set[loop.spawn]
+tasks: Set[loop.spawn] = set()
 
 # Default workflow task, if a default workflow is running.  Default workflow
 # is not contained in the `tasks` set above.
-default_task = None  # type: Optional[loop.spawn]
+default_task: Optional[loop.spawn] = None
 
 # Constructor for the default workflow.  Returns a workflow task.
-default_constructor = None  # type: Optional[Callable[[], loop.Task]]
+default_constructor: Optional[Callable[[], loop.Task]] = None
 
 
 def _on_start(workflow: loop.spawn) -> None:
@@ -159,8 +159,8 @@ class IdleTimer:
     """
 
     def __init__(self) -> None:
-        self.timeouts = {}  # type: Dict[IdleCallback, int]
-        self.tasks = {}  # type: Dict[IdleCallback, loop.Task]
+        self.timeouts: Dict[IdleCallback, int] = {}
+        self.tasks: Dict[IdleCallback, loop.Task] = {}
 
     async def _timeout_task(self, callback: IdleCallback) -> None:
         # This function is async, so the result of self._timeout_task() is an awaitable,