diff --git a/src/apps/common/cache.py b/src/apps/common/cache.py
index 25bff34d6..b58684bf7 100644
--- a/src/apps/common/cache.py
+++ b/src/apps/common/cache.py
@@ -1,4 +1,5 @@
 from trezor.crypto import hashlib, hmac, random
+
 from apps.common import storage
 
 _cached_seed = None
diff --git a/src/apps/common/display_address.py b/src/apps/common/display_address.py
index 8d8eb74ca..17691fcaf 100644
--- a/src/apps/common/display_address.py
+++ b/src/apps/common/display_address.py
@@ -1,5 +1,5 @@
 from micropython import const
-from apps.common.confirm import confirm
+
 from trezor import ui
 from trezor.messages import ButtonRequestType
 from trezor.ui.container import Container
@@ -7,6 +7,8 @@ from trezor.ui.qr import Qr
 from trezor.ui.text import Text
 from trezor.utils import chunks
 
+from apps.common.confirm import confirm
+
 
 async def show_address(ctx, address: str):
     lines = split_address(address)
diff --git a/src/apps/common/request_passphrase.py b/src/apps/common/request_passphrase.py
index 8527772b6..5faec3229 100644
--- a/src/apps/common/request_passphrase.py
+++ b/src/apps/common/request_passphrase.py
@@ -1,12 +1,12 @@
 from trezor import ui, wire
-from trezor.messages import ButtonRequestType, MessageType
+from trezor.messages import ButtonRequestType, MessageType, PassphraseSourceType
 from trezor.messages.ButtonRequest import ButtonRequest
-from trezor.messages import PassphraseSourceType
 from trezor.messages.PassphraseRequest import PassphraseRequest
 from trezor.messages.PassphraseStateRequest import PassphraseStateRequest
 from trezor.ui.entry_select import DEVICE, EntrySelector
 from trezor.ui.passphrase import CANCELLED, PassphraseKeyboard
 from trezor.ui.text import Text
+
 from apps.common import storage
 from apps.common.cache import get_state
 
diff --git a/src/apps/common/seed.py b/src/apps/common/seed.py
index ee7718666..f774f65b9 100644
--- a/src/apps/common/seed.py
+++ b/src/apps/common/seed.py
@@ -1,5 +1,6 @@
 from trezor import wire
 from trezor.crypto import bip32, bip39
+
 from apps.common import cache, storage
 from apps.common.request_passphrase import protect_by_passphrase
 
diff --git a/src/apps/common/signverify.py b/src/apps/common/signverify.py
index 0bef2ff8e..2db3e5f75 100644
--- a/src/apps/common/signverify.py
+++ b/src/apps/common/signverify.py
@@ -1,8 +1,10 @@
+from ubinascii import hexlify
+
 from trezor import ui
 from trezor.crypto.hashlib import sha256
 from trezor.ui.text import TEXT_MARGIN_LEFT
 from trezor.utils import HashWriter, chunks, split_words
-from ubinascii import hexlify
+
 from apps.wallet.sign_tx.signing import write_varint
 
 
diff --git a/src/apps/common/storage.py b/src/apps/common/storage.py
index b3406cf9e..f27b088b3 100644
--- a/src/apps/common/storage.py
+++ b/src/apps/common/storage.py
@@ -1,7 +1,9 @@
 from micropython import const
 from ubinascii import hexlify
+
 from trezor import config
 from trezor.crypto import random
+
 from apps.common import cache
 
 HOMESCREEN_MAXSIZE = 16384
diff --git a/src/apps/ethereum/__init__.py b/src/apps/ethereum/__init__.py
index 622a6ffd6..4229afbef 100644
--- a/src/apps/ethereum/__init__.py
+++ b/src/apps/ethereum/__init__.py
@@ -1,6 +1,10 @@
-from trezor.wire import register, protobuf_workflow
-from trezor.messages.MessageType import EthereumGetAddress, EthereumSignTx
-from trezor.messages.MessageType import EthereumSignMessage, EthereumVerifyMessage
+from trezor.messages.MessageType import (
+    EthereumGetAddress,
+    EthereumSignMessage,
+    EthereumSignTx,
+    EthereumVerifyMessage,
+)
+from trezor.wire import protobuf_workflow, register
 
 
 def dispatch_EthereumGetAddress(*args, **kwargs):
diff --git a/src/apps/ethereum/layout.py b/src/apps/ethereum/layout.py
index d006a2669..df58fba00 100644
--- a/src/apps/ethereum/layout.py
+++ b/src/apps/ethereum/layout.py
@@ -1,9 +1,9 @@
 from ubinascii import hexlify
 
 from trezor import ui
-from trezor.utils import chunks, format_amount
 from trezor.messages import ButtonRequestType
 from trezor.ui.text import Text
+from trezor.utils import chunks, format_amount
 
 from apps.common.confirm import require_confirm, require_hold_to_confirm
 from apps.ethereum import networks, tokens
diff --git a/src/apps/ethereum/sign_message.py b/src/apps/ethereum/sign_message.py
index 22528dde1..a7cdf85bf 100644
--- a/src/apps/ethereum/sign_message.py
+++ b/src/apps/ethereum/sign_message.py
@@ -1,8 +1,9 @@
+from trezor.crypto.curve import secp256k1
 from trezor.crypto.hashlib import sha3_256
-from trezor.utils import HashWriter
 from trezor.messages.EthereumMessageSignature import EthereumMessageSignature
 from trezor.ui.text import Text
-from trezor.crypto.curve import secp256k1
+from trezor.utils import HashWriter
+
 from apps.common import seed
 from apps.common.confirm import require_confirm
 from apps.common.signverify import split_message
diff --git a/src/apps/ethereum/sign_tx.py b/src/apps/ethereum/sign_tx.py
index bf5e46273..b00cc6377 100644
--- a/src/apps/ethereum/sign_tx.py
+++ b/src/apps/ethereum/sign_tx.py
@@ -1,10 +1,15 @@
 from trezor import wire
+from trezor.crypto import rlp
 from trezor.messages.EthereumSignTx import EthereumSignTx
 from trezor.messages.EthereumTxRequest import EthereumTxRequest
 from trezor.utils import HashWriter
-from trezor.crypto import rlp
+
 from apps.ethereum import tokens
-from apps.ethereum.layout import require_confirm_tx, require_confirm_data, require_confirm_fee
+from apps.ethereum.layout import (
+    require_confirm_data,
+    require_confirm_fee,
+    require_confirm_tx,
+)
 
 # maximum supported chain id
 MAX_CHAIN_ID = 2147483630
diff --git a/src/apps/ethereum/verify_message.py b/src/apps/ethereum/verify_message.py
index b8d7a2dea..806e23ebd 100644
--- a/src/apps/ethereum/verify_message.py
+++ b/src/apps/ethereum/verify_message.py
@@ -1,8 +1,10 @@
 from ubinascii import hexlify
+
 from trezor.crypto.curve import secp256k1
 from trezor.crypto.hashlib import sha3_256
-from trezor.ui.text import Text
 from trezor.messages.Success import Success
+from trezor.ui.text import Text
+
 from apps.common.confirm import require_confirm
 from apps.common.display_address import split_address
 from apps.common.signverify import split_message
diff --git a/src/apps/fido_u2f/__init__.py b/src/apps/fido_u2f/__init__.py
index a676c1d84..8b3ba780a 100644
--- a/src/apps/fido_u2f/__init__.py
+++ b/src/apps/fido_u2f/__init__.py
@@ -1,22 +1,13 @@
-from micropython import const
-
 import uctypes
 import ustruct
 import utime
+from micropython import const
 
-from trezor import log
-from trezor import loop
-from trezor import io
-from trezor import ui
-from trezor import utils
-from trezor import workflow
-from trezor.crypto import der
-from trezor.crypto import hashlib
-from trezor.crypto import hmac
-from trezor.crypto import random
+from trezor import io, log, loop, ui, utils, workflow
+from trezor.crypto import der, hashlib, hmac, random
 from trezor.crypto.curve import nist256p1
-from apps.common import storage, HARDENED
 
+from apps.common import HARDENED, storage
 
 _HID_RPT_SIZE = const(64)
 _CID_BROADCAST = const(0xffffffff)  # broadcast channel id
diff --git a/src/apps/homescreen/__init__.py b/src/apps/homescreen/__init__.py
index 7ee3dc62d..18202302d 100644
--- a/src/apps/homescreen/__init__.py
+++ b/src/apps/homescreen/__init__.py
@@ -1,10 +1,10 @@
 from trezor import config, utils, wire
-from trezor.wire import register, protobuf_workflow
 from trezor.messages import MessageType
 from trezor.messages.Features import Features
 from trezor.messages.Success import Success
+from trezor.wire import protobuf_workflow, register
 
-from apps.common import storage, cache
+from apps.common import cache, storage
 
 
 def get_features():
diff --git a/src/apps/homescreen/homescreen.py b/src/apps/homescreen/homescreen.py
index 2e84f503b..ab5fafc89 100644
--- a/src/apps/homescreen/homescreen.py
+++ b/src/apps/homescreen/homescreen.py
@@ -1,5 +1,6 @@
-from trezor import ui, res, config
+from trezor import config, res, ui
 from trezor.ui.swipe import Swipe, degrees
+
 from apps.common import storage
 
 
diff --git a/src/apps/lisk/__init__.py b/src/apps/lisk/__init__.py
index 153410be6..f20918ca4 100644
--- a/src/apps/lisk/__init__.py
+++ b/src/apps/lisk/__init__.py
@@ -1,6 +1,11 @@
-from trezor.wire import register, protobuf_workflow
-from trezor.messages.MessageType import \
-    LiskGetAddress, LiskSignTx, LiskGetPublicKey, LiskSignMessage, LiskVerifyMessage
+from trezor.messages.MessageType import (
+    LiskGetAddress,
+    LiskGetPublicKey,
+    LiskSignMessage,
+    LiskSignTx,
+    LiskVerifyMessage,
+)
+from trezor.wire import protobuf_workflow, register
 
 
 def dispatch_LiskGetAddress(*args, **kwargs):
diff --git a/src/apps/lisk/get_address.py b/src/apps/lisk/get_address.py
index 5d735fd3f..ba61db76d 100644
--- a/src/apps/lisk/get_address.py
+++ b/src/apps/lisk/get_address.py
@@ -1,9 +1,10 @@
-from apps.common import seed
-from apps.common.display_address import show_address, show_qr
 from trezor.messages.LiskAddress import LiskAddress
 
 from .helpers import LISK_CURVE, get_address_from_public_key
 
+from apps.common import seed
+from apps.common.display_address import show_address, show_qr
+
 
 async def layout_lisk_get_address(ctx, msg):
     address_n = msg.address_n or ()
diff --git a/src/apps/lisk/get_public_key.py b/src/apps/lisk/get_public_key.py
index d79ec6fb1..7fa55e49a 100644
--- a/src/apps/lisk/get_public_key.py
+++ b/src/apps/lisk/get_public_key.py
@@ -1,9 +1,10 @@
-from apps.common import seed
-from apps.wallet.get_public_key import _show_pubkey
 from trezor.messages.LiskPublicKey import LiskPublicKey
 
 from .helpers import LISK_CURVE
 
+from apps.common import seed
+from apps.wallet.get_public_key import _show_pubkey
+
 
 async def lisk_get_public_key(ctx, msg):
     address_n = msg.address_n or ()
diff --git a/src/apps/lisk/layout.py b/src/apps/lisk/layout.py
index f567701ea..25e67c737 100644
--- a/src/apps/lisk/layout.py
+++ b/src/apps/lisk/layout.py
@@ -1,5 +1,3 @@
-from apps.common.confirm import require_confirm, require_hold_to_confirm
-from apps.wallet.get_public_key import _show_pubkey
 from trezor import ui
 from trezor.messages import ButtonRequestType
 from trezor.ui.text import Text
@@ -7,6 +5,9 @@ from trezor.utils import chunks
 
 from .helpers import get_vote_tx_text
 
+from apps.common.confirm import require_confirm, require_hold_to_confirm
+from apps.wallet.get_public_key import _show_pubkey
+
 
 async def require_confirm_tx(ctx, to, value):
     text = Text('Confirm sending', ui.ICON_SEND, icon_color=ui.GREEN)
diff --git a/src/apps/lisk/sign_message.py b/src/apps/lisk/sign_message.py
index 03875a24c..c48066a26 100644
--- a/src/apps/lisk/sign_message.py
+++ b/src/apps/lisk/sign_message.py
@@ -1,7 +1,3 @@
-from apps.common import seed
-from apps.common.confirm import require_confirm
-from apps.common.signverify import split_message
-from apps.wallet.sign_tx.signing import write_varint
 from trezor.crypto.curve import ed25519
 from trezor.crypto.hashlib import sha256
 from trezor.messages.LiskMessageSignature import LiskMessageSignature
@@ -10,6 +6,11 @@ from trezor.utils import HashWriter
 
 from .helpers import LISK_CURVE
 
+from apps.common import seed
+from apps.common.confirm import require_confirm
+from apps.common.signverify import split_message
+from apps.wallet.sign_tx.signing import write_varint
+
 
 def message_digest(message):
     h = HashWriter(sha256)
diff --git a/src/apps/lisk/sign_tx.py b/src/apps/lisk/sign_tx.py
index 28a0167c7..330e7079d 100644
--- a/src/apps/lisk/sign_tx.py
+++ b/src/apps/lisk/sign_tx.py
@@ -1,5 +1,5 @@
 import ustruct
-from apps.common import seed
+
 from trezor import wire
 from trezor.crypto.curve import ed25519
 from trezor.crypto.hashlib import sha256
@@ -10,6 +10,8 @@ from trezor.utils import HashWriter
 from . import layout
 from .helpers import LISK_CURVE, get_address_from_public_key
 
+from apps.common import seed
+
 
 async def lisk_sign_tx(ctx, msg):
     pubkey, seckey = await _get_keys(ctx, msg)
diff --git a/src/apps/lisk/verify_message.py b/src/apps/lisk/verify_message.py
index 53632f089..9fbd1f2a6 100644
--- a/src/apps/lisk/verify_message.py
+++ b/src/apps/lisk/verify_message.py
@@ -1,4 +1,3 @@
-from apps.wallet.verify_message import require_confirm_verify_message
 from trezor import wire
 from trezor.crypto.curve import ed25519
 from trezor.messages.Success import Success
@@ -6,6 +5,8 @@ from trezor.messages.Success import Success
 from .helpers import get_address_from_public_key
 from .sign_message import message_digest
 
+from apps.wallet.verify_message import require_confirm_verify_message
+
 
 async def lisk_verify_message(ctx, msg):
     digest = message_digest(msg.message)
diff --git a/src/apps/management/__init__.py b/src/apps/management/__init__.py
index 07595cb66..7323d6487 100644
--- a/src/apps/management/__init__.py
+++ b/src/apps/management/__init__.py
@@ -1,6 +1,15 @@
-from trezor.wire import register, protobuf_workflow
-from trezor.messages.MessageType import \
-    LoadDevice, ResetDevice, BackupDevice, WipeDevice, RecoveryDevice, ApplySettings, ApplyFlags, ChangePin, SetU2FCounter
+from trezor.messages.MessageType import (
+    ApplyFlags,
+    ApplySettings,
+    BackupDevice,
+    ChangePin,
+    LoadDevice,
+    RecoveryDevice,
+    ResetDevice,
+    SetU2FCounter,
+    WipeDevice,
+)
+from trezor.wire import protobuf_workflow, register
 
 
 def dispatch_LoadDevice(*args, **kwargs):
diff --git a/src/apps/management/apply_flags.py b/src/apps/management/apply_flags.py
index 7effa2cad..a55c8bea7 100644
--- a/src/apps/management/apply_flags.py
+++ b/src/apps/management/apply_flags.py
@@ -1,4 +1,5 @@
 from trezor.messages.Success import Success
+
 from apps.common import storage
 
 
diff --git a/src/apps/management/apply_settings.py b/src/apps/management/apply_settings.py
index 3e225cd48..24f5cb07b 100644
--- a/src/apps/management/apply_settings.py
+++ b/src/apps/management/apply_settings.py
@@ -2,6 +2,7 @@ from trezor import ui, wire
 from trezor.messages import ButtonRequestType, PassphraseSourceType
 from trezor.messages.Success import Success
 from trezor.ui.text import Text
+
 from apps.common import storage
 from apps.common.confirm import require_confirm
 
diff --git a/src/apps/management/backup_device.py b/src/apps/management/backup_device.py
index 175bd171c..d1bf8416b 100644
--- a/src/apps/management/backup_device.py
+++ b/src/apps/management/backup_device.py
@@ -1,5 +1,6 @@
 from trezor import wire
 from trezor.messages.Success import Success
+
 from apps.common import storage
 from apps.management.reset_device import (
     check_mnemonic,
diff --git a/src/apps/management/change_pin.py b/src/apps/management/change_pin.py
index 754ef8e0f..307b69d52 100644
--- a/src/apps/management/change_pin.py
+++ b/src/apps/management/change_pin.py
@@ -1,10 +1,10 @@
 from trezor import config, loop, ui, wire
-from trezor.messages import MessageType
-from trezor.messages import ButtonRequestType
+from trezor.messages import ButtonRequestType, MessageType
 from trezor.messages.ButtonRequest import ButtonRequest
 from trezor.messages.Success import Success
 from trezor.pin import pin_to_int, show_pin_timeout
 from trezor.ui.text import Text
+
 from apps.common.confirm import require_confirm
 from apps.common.request_pin import PinCancelled, request_pin
 
diff --git a/src/apps/management/load_device.py b/src/apps/management/load_device.py
index 3e8e47e77..e97552c3c 100644
--- a/src/apps/management/load_device.py
+++ b/src/apps/management/load_device.py
@@ -3,6 +3,7 @@ from trezor.crypto import bip39
 from trezor.messages.Success import Success
 from trezor.pin import pin_to_int
 from trezor.ui.text import Text
+
 from apps.common import storage
 from apps.common.confirm import require_confirm
 
diff --git a/src/apps/management/recovery_device.py b/src/apps/management/recovery_device.py
index 2a4b77fa1..7ea517521 100644
--- a/src/apps/management/recovery_device.py
+++ b/src/apps/management/recovery_device.py
@@ -1,14 +1,15 @@
 from trezor import config, ui, wire
 from trezor.crypto import bip39
 from trezor.messages.ButtonRequest import ButtonRequest
-from trezor.messages.ButtonRequestType import MnemonicWordCount, MnemonicInput
-from trezor.messages.Success import Success
+from trezor.messages.ButtonRequestType import MnemonicInput, MnemonicWordCount
 from trezor.messages.MessageType import ButtonAck
+from trezor.messages.Success import Success
 from trezor.pin import pin_to_int
 from trezor.ui.mnemonic import MnemonicKeyboard
 from trezor.ui.text import Text
 from trezor.ui.word_select import WordSelector
 from trezor.utils import format_ordinal
+
 from apps.common import storage
 from apps.management.change_pin import request_pin_confirm
 
diff --git a/src/apps/management/reset_device.py b/src/apps/management/reset_device.py
index 4f1ddb8d7..2c9b49f87 100644
--- a/src/apps/management/reset_device.py
+++ b/src/apps/management/reset_device.py
@@ -1,18 +1,19 @@
 from micropython import const
-from trezor import config, ui, wire
+from ubinascii import hexlify
+
+from trezor import config, ui, wire, workflow
 from trezor.crypto import bip39, hashlib, random
 from trezor.messages import ButtonRequestType, MessageType
 from trezor.messages.ButtonRequest import ButtonRequest
 from trezor.messages.EntropyRequest import EntropyRequest
 from trezor.messages.Success import Success
-from trezor import workflow
 from trezor.pin import pin_to_int
 from trezor.ui.confirm import HoldToConfirmDialog
 from trezor.ui.mnemonic import MnemonicKeyboard
 from trezor.ui.scroll import Scrollpage, animate_swipe, paginate
 from trezor.ui.text import Text
 from trezor.utils import chunks, format_ordinal
-from ubinascii import hexlify
+
 from apps.common import storage
 from apps.common.confirm import require_confirm
 from apps.management.change_pin import request_pin_confirm
diff --git a/src/apps/management/set_u2f_counter.py b/src/apps/management/set_u2f_counter.py
index 89e7bc5c4..49a91e6cd 100644
--- a/src/apps/management/set_u2f_counter.py
+++ b/src/apps/management/set_u2f_counter.py
@@ -2,6 +2,7 @@ from trezor import ui, wire
 from trezor.messages import ButtonRequestType
 from trezor.messages.Success import Success
 from trezor.ui.text import Text
+
 from apps.common import storage
 from apps.common.confirm import require_confirm
 
diff --git a/src/apps/management/wipe_device.py b/src/apps/management/wipe_device.py
index a31b459a1..4308d2fe3 100644
--- a/src/apps/management/wipe_device.py
+++ b/src/apps/management/wipe_device.py
@@ -2,6 +2,7 @@ from trezor import ui
 from trezor.messages import ButtonRequestType
 from trezor.messages.Success import Success
 from trezor.ui.text import Text
+
 from apps.common import storage
 from apps.common.confirm import require_hold_to_confirm
 
diff --git a/src/apps/nem/__init__.py b/src/apps/nem/__init__.py
index 995ba5565..ea68af2c5 100644
--- a/src/apps/nem/__init__.py
+++ b/src/apps/nem/__init__.py
@@ -1,5 +1,5 @@
-from trezor.wire import register, protobuf_workflow
 from trezor.messages.MessageType import NEMGetAddress, NEMSignTx
+from trezor.wire import protobuf_workflow, register
 
 
 def dispatch_NemGetAddress(*args, **kwargs):
diff --git a/src/apps/nem/get_address.py b/src/apps/nem/get_address.py
index b4799d663..cdbdb001a 100644
--- a/src/apps/nem/get_address.py
+++ b/src/apps/nem/get_address.py
@@ -3,14 +3,14 @@ from trezor.messages import ButtonRequestType
 from trezor.messages.NEMAddress import NEMAddress
 from trezor.ui.text import Text
 
+from .helpers import NEM_CURVE, get_network_str
+from .layout import split_address
+from .validators import validate_network
+
 from apps.common import seed
 from apps.common.confirm import confirm
 from apps.common.display_address import show_qr
 
-from .layout import split_address
-from .helpers import get_network_str, NEM_CURVE
-from .validators import validate_network
-
 
 async def get_address(ctx, msg):
     network = validate_network(msg.network)
diff --git a/src/apps/nem/layout.py b/src/apps/nem/layout.py
index f6b62157a..d1fb77cdf 100644
--- a/src/apps/nem/layout.py
+++ b/src/apps/nem/layout.py
@@ -3,10 +3,10 @@ from trezor.messages import ButtonRequestType
 from trezor.ui.text import Text
 from trezor.utils import chunks, format_amount, split_words
 
-from apps.common.confirm import require_confirm, require_hold_to_confirm
-
 from .helpers import NEM_MAX_DIVISIBILITY
 
+from apps.common.confirm import require_confirm, require_hold_to_confirm
+
 
 async def require_confirm_text(ctx, action: str):
     words = split_words(action, 18)
diff --git a/src/apps/nem/mosaic/__init__.py b/src/apps/nem/mosaic/__init__.py
index da6ba45d5..cf53c24e3 100644
--- a/src/apps/nem/mosaic/__init__.py
+++ b/src/apps/nem/mosaic/__init__.py
@@ -1,6 +1,6 @@
-from trezor.messages.NEMTransactionCommon import NEMTransactionCommon
 from trezor.messages.NEMMosaicCreation import NEMMosaicCreation
 from trezor.messages.NEMMosaicSupplyChange import NEMMosaicSupplyChange
+from trezor.messages.NEMTransactionCommon import NEMTransactionCommon
 
 from . import layout, serialize
 
diff --git a/src/apps/nem/mosaic/layout.py b/src/apps/nem/mosaic/layout.py
index 2a4f29b2e..a0f76038c 100644
--- a/src/apps/nem/mosaic/layout.py
+++ b/src/apps/nem/mosaic/layout.py
@@ -1,16 +1,27 @@
 from micropython import const
+
 from trezor import ui
-from trezor.messages import (NEMMosaicCreation, NEMMosaicDefinition,
-                             NEMMosaicLevy, NEMMosaicSupplyChange,
-                             NEMSupplyChangeType, NEMTransactionCommon)
+from trezor.messages import (
+    NEMMosaicCreation,
+    NEMMosaicDefinition,
+    NEMMosaicLevy,
+    NEMMosaicSupplyChange,
+    NEMSupplyChangeType,
+    NEMTransactionCommon,
+)
 from trezor.ui.confirm import ConfirmDialog
 from trezor.ui.scroll import Scrollpage, animate_swipe, paginate
 from trezor.ui.text import Text
 from trezor.utils import split_words
 
-from ..layout import (require_confirm_content, require_confirm_fee,
-                      require_confirm_final, require_confirm_text,
-                      split_address, trim)
+from ..layout import (
+    require_confirm_content,
+    require_confirm_fee,
+    require_confirm_final,
+    require_confirm_text,
+    split_address,
+    trim,
+)
 
 
 async def ask_mosaic_creation(ctx, common: NEMTransactionCommon, creation: NEMMosaicCreation):
diff --git a/src/apps/nem/mosaic/serialize.py b/src/apps/nem/mosaic/serialize.py
index aee2a97d4..24cb62e72 100644
--- a/src/apps/nem/mosaic/serialize.py
+++ b/src/apps/nem/mosaic/serialize.py
@@ -2,10 +2,11 @@ from trezor.messages.NEMMosaicCreation import NEMMosaicCreation
 from trezor.messages.NEMMosaicSupplyChange import NEMMosaicSupplyChange
 from trezor.messages.NEMTransactionCommon import NEMTransactionCommon
 
-from ..helpers import (NEM_TRANSACTION_TYPE_MOSAIC_CREATION,
-                       NEM_TRANSACTION_TYPE_MOSAIC_SUPPLY_CHANGE)
-from ..writers import (write_bytes_with_length, write_common, write_uint32,
-                       write_uint64)
+from ..helpers import (
+    NEM_TRANSACTION_TYPE_MOSAIC_CREATION,
+    NEM_TRANSACTION_TYPE_MOSAIC_SUPPLY_CHANGE,
+)
+from ..writers import write_bytes_with_length, write_common, write_uint32, write_uint64
 
 
 def serialize_mosaic_creation(common: NEMTransactionCommon, creation: NEMMosaicCreation, public_key: bytes):
diff --git a/src/apps/nem/multisig/layout.py b/src/apps/nem/multisig/layout.py
index ff4ebf182..25e3c0131 100644
--- a/src/apps/nem/multisig/layout.py
+++ b/src/apps/nem/multisig/layout.py
@@ -1,13 +1,21 @@
 from trezor import ui
 from trezor.crypto import nem
-from trezor.messages import (ButtonRequestType, NEMAggregateModification,
-                             NEMModificationType, NEMSignTx,
-                             NEMTransactionCommon)
+from trezor.messages import (
+    ButtonRequestType,
+    NEMAggregateModification,
+    NEMModificationType,
+    NEMSignTx,
+    NEMTransactionCommon,
+)
 from trezor.ui.text import Text
 
-from ..layout import (require_confirm, require_confirm_fee,
-                      require_confirm_final, require_confirm_text,
-                      split_address)
+from ..layout import (
+    require_confirm,
+    require_confirm_fee,
+    require_confirm_final,
+    require_confirm_text,
+    split_address,
+)
 
 
 async def ask_multisig(ctx, msg: NEMSignTx):
diff --git a/src/apps/nem/multisig/serialize.py b/src/apps/nem/multisig/serialize.py
index 98358fa9c..7f6515471 100644
--- a/src/apps/nem/multisig/serialize.py
+++ b/src/apps/nem/multisig/serialize.py
@@ -2,9 +2,11 @@ from trezor.crypto import hashlib, nem
 from trezor.messages.NEMAggregateModification import NEMAggregateModification
 from trezor.messages.NEMTransactionCommon import NEMTransactionCommon
 
-from ..helpers import (NEM_TRANSACTION_TYPE_AGGREGATE_MODIFICATION,
-                       NEM_TRANSACTION_TYPE_MULTISIG,
-                       NEM_TRANSACTION_TYPE_MULTISIG_SIGNATURE)
+from ..helpers import (
+    NEM_TRANSACTION_TYPE_AGGREGATE_MODIFICATION,
+    NEM_TRANSACTION_TYPE_MULTISIG,
+    NEM_TRANSACTION_TYPE_MULTISIG_SIGNATURE,
+)
 from ..writers import write_bytes_with_length, write_common, write_uint32
 
 
diff --git a/src/apps/nem/namespace/__init__.py b/src/apps/nem/namespace/__init__.py
index 662c30b5c..75dd27008 100644
--- a/src/apps/nem/namespace/__init__.py
+++ b/src/apps/nem/namespace/__init__.py
@@ -1,5 +1,5 @@
-from trezor.messages.NEMTransactionCommon import NEMTransactionCommon
 from trezor.messages.NEMProvisionNamespace import NEMProvisionNamespace
+from trezor.messages.NEMTransactionCommon import NEMTransactionCommon
 
 from . import layout, serialize
 
diff --git a/src/apps/nem/namespace/layout.py b/src/apps/nem/namespace/layout.py
index 012cdec93..8e262501e 100644
--- a/src/apps/nem/namespace/layout.py
+++ b/src/apps/nem/namespace/layout.py
@@ -1,8 +1,7 @@
 from trezor import ui
 from trezor.messages import NEMProvisionNamespace, NEMTransactionCommon
 
-from ..layout import (require_confirm_content, require_confirm_fee,
-                      require_confirm_final)
+from ..layout import require_confirm_content, require_confirm_fee, require_confirm_final
 
 
 async def ask_provision_namespace(ctx, common: NEMTransactionCommon, namespace: NEMProvisionNamespace):
diff --git a/src/apps/nem/signing.py b/src/apps/nem/signing.py
index d6739a487..00d8c601d 100644
--- a/src/apps/nem/signing.py
+++ b/src/apps/nem/signing.py
@@ -1,12 +1,13 @@
 from trezor.crypto.curve import ed25519
 from trezor.messages.NEMSignedTx import NEMSignedTx
 from trezor.messages.NEMSignTx import NEMSignTx
-from apps.common import seed
 
 from . import mosaic, multisig, namespace, transfer
 from .helpers import NEM_CURVE, NEM_HASH_ALG
 from .validators import validate
 
+from apps.common import seed
+
 
 async def sign_tx(ctx, msg: NEMSignTx):
     validate(msg)
diff --git a/src/apps/nem/transfer/__init__.py b/src/apps/nem/transfer/__init__.py
index f9fcc4173..3986d1418 100644
--- a/src/apps/nem/transfer/__init__.py
+++ b/src/apps/nem/transfer/__init__.py
@@ -1,6 +1,6 @@
-from trezor.messages.NEMTransfer import NEMTransfer
-from trezor.messages.NEMTransactionCommon import NEMTransactionCommon
 from trezor.messages.NEMImportanceTransfer import NEMImportanceTransfer
+from trezor.messages.NEMTransactionCommon import NEMTransactionCommon
+from trezor.messages.NEMTransfer import NEMTransfer
 
 from . import layout, serialize
 
diff --git a/src/apps/nem/transfer/layout.py b/src/apps/nem/transfer/layout.py
index b4292d07e..1e03f8a41 100644
--- a/src/apps/nem/transfer/layout.py
+++ b/src/apps/nem/transfer/layout.py
@@ -1,17 +1,26 @@
 from trezor import ui
-from trezor.messages import (ButtonRequestType, NEMImportanceTransfer,
-                             NEMImportanceTransferMode, NEMMosaic,
-                             NEMMosaicLevy, NEMTransactionCommon, NEMTransfer)
+from trezor.messages import (
+    ButtonRequestType,
+    NEMImportanceTransfer,
+    NEMImportanceTransferMode,
+    NEMMosaic,
+    NEMMosaicLevy,
+    NEMTransactionCommon,
+    NEMTransfer,
+)
 from trezor.ui.text import Text
 from trezor.utils import format_amount, split_words
 
-from apps.common.confirm import require_confirm
-
-from ..helpers import (NEM_LEVY_PERCENTILE_DIVISOR_ABSOLUTE,
-                       NEM_MAX_DIVISIBILITY, NEM_MOSAIC_AMOUNT_DIVISOR)
+from ..helpers import (
+    NEM_LEVY_PERCENTILE_DIVISOR_ABSOLUTE,
+    NEM_MAX_DIVISIBILITY,
+    NEM_MOSAIC_AMOUNT_DIVISOR,
+)
 from ..layout import require_confirm_final, require_confirm_text, split_address
 from ..mosaic.helpers import get_mosaic_definition, is_nem_xem_mosaic
 
+from apps.common.confirm import require_confirm
+
 
 async def ask_transfer(ctx, common: NEMTransactionCommon, transfer: NEMTransfer, payload: bytes, encrypted: bool):
     if payload:
diff --git a/src/apps/nem/transfer/serialize.py b/src/apps/nem/transfer/serialize.py
index 9086c32bb..ef6943d7b 100644
--- a/src/apps/nem/transfer/serialize.py
+++ b/src/apps/nem/transfer/serialize.py
@@ -4,9 +4,12 @@ from trezor.messages.NEMMosaic import NEMMosaic
 from trezor.messages.NEMTransactionCommon import NEMTransactionCommon
 from trezor.messages.NEMTransfer import NEMTransfer
 
-from ..helpers import (AES_BLOCK_SIZE, NEM_SALT_SIZE,
-                       NEM_TRANSACTION_TYPE_IMPORTANCE_TRANSFER,
-                       NEM_TRANSACTION_TYPE_TRANSFER)
+from ..helpers import (
+    AES_BLOCK_SIZE,
+    NEM_SALT_SIZE,
+    NEM_TRANSACTION_TYPE_IMPORTANCE_TRANSFER,
+    NEM_TRANSACTION_TYPE_TRANSFER,
+)
 from ..writers import write_bytes_with_length, write_common, write_uint32, write_uint64
 
 
diff --git a/src/apps/nem/validators.py b/src/apps/nem/validators.py
index 764e5c540..702ebb814 100644
--- a/src/apps/nem/validators.py
+++ b/src/apps/nem/validators.py
@@ -1,18 +1,27 @@
 from trezor.crypto import nem
+from trezor.messages import NEMModificationType, NEMSupplyChangeType
+from trezor.messages.NEMSignTx import (
+    NEMAggregateModification,
+    NEMImportanceTransfer,
+    NEMMosaicCreation,
+    NEMMosaicSupplyChange,
+    NEMProvisionNamespace,
+    NEMSignTx,
+    NEMTransactionCommon,
+    NEMTransfer,
+)
 from trezor.wire import ProcessError
-from trezor.messages import NEMModificationType
-from trezor.messages import NEMSupplyChangeType
-from trezor.messages.NEMSignTx import (NEMAggregateModification,
-                                       NEMImportanceTransfer,
-                                       NEMMosaicCreation,
-                                       NEMMosaicSupplyChange,
-                                       NEMProvisionNamespace, NEMSignTx,
-                                       NEMTransactionCommon, NEMTransfer)
-
-from .helpers import (NEM_MAX_DIVISIBILITY, NEM_MAX_ENCRYPTED_PAYLOAD_SIZE,
-                      NEM_MAX_PLAIN_PAYLOAD_SIZE, NEM_MAX_SUPPLY,
-                      NEM_NETWORK_MAINNET, NEM_NETWORK_MIJIN,
-                      NEM_NETWORK_TESTNET, NEM_PUBLIC_KEY_SIZE)
+
+from .helpers import (
+    NEM_MAX_DIVISIBILITY,
+    NEM_MAX_ENCRYPTED_PAYLOAD_SIZE,
+    NEM_MAX_PLAIN_PAYLOAD_SIZE,
+    NEM_MAX_SUPPLY,
+    NEM_NETWORK_MAINNET,
+    NEM_NETWORK_MIJIN,
+    NEM_NETWORK_TESTNET,
+    NEM_PUBLIC_KEY_SIZE,
+)
 
 
 def validate(msg: NEMSignTx):
diff --git a/src/apps/wallet/__init__.py b/src/apps/wallet/__init__.py
index 187f712b1..3a9ee0667 100644
--- a/src/apps/wallet/__init__.py
+++ b/src/apps/wallet/__init__.py
@@ -1,12 +1,15 @@
-from trezor.wire import register, protobuf_workflow
-from trezor.messages.MessageType import \
-    GetPublicKey, GetAddress, \
-    GetEntropy, \
-    SignTx, \
-    SignMessage, VerifyMessage, \
-    SignIdentity, \
-    GetECDHSessionKey, \
-    CipherKeyValue
+from trezor.messages.MessageType import (
+    CipherKeyValue,
+    GetAddress,
+    GetECDHSessionKey,
+    GetEntropy,
+    GetPublicKey,
+    SignIdentity,
+    SignMessage,
+    SignTx,
+    VerifyMessage,
+)
+from trezor.wire import protobuf_workflow, register
 
 
 def dispatch_GetPublicKey(*args, **kwargs):
diff --git a/src/apps/wallet/cipher_key_value.py b/src/apps/wallet/cipher_key_value.py
index ce4fa216d..b01948679 100644
--- a/src/apps/wallet/cipher_key_value.py
+++ b/src/apps/wallet/cipher_key_value.py
@@ -4,6 +4,7 @@ from trezor.crypto.aes import AES_CBC_Decrypt, AES_CBC_Encrypt
 from trezor.crypto.hashlib import sha512
 from trezor.messages.CipheredKeyValue import CipheredKeyValue
 from trezor.ui.text import Text
+
 from apps.common import seed
 from apps.common.confirm import require_confirm
 
diff --git a/src/apps/wallet/ecdh.py b/src/apps/wallet/ecdh.py
index 81e162999..4b62beea6 100644
--- a/src/apps/wallet/ecdh.py
+++ b/src/apps/wallet/ecdh.py
@@ -1,12 +1,16 @@
+from ustruct import pack, unpack
+
 from trezor.crypto.hashlib import sha256
 from trezor.messages.ECDHSessionKey import ECDHSessionKey
-from ustruct import pack, unpack
-from trezor.utils import chunks
-from apps.common.confirm import require_confirm
-from apps.wallet.sign_identity import serialize_identity, serialize_identity_without_proto
 from trezor.ui.text import Text
+from trezor.utils import chunks
 
-from apps.common import seed, HARDENED
+from apps.common import HARDENED, seed
+from apps.common.confirm import require_confirm
+from apps.wallet.sign_identity import (
+    serialize_identity,
+    serialize_identity_without_proto,
+)
 
 
 async def get_ecdh_session_key(ctx, msg):
diff --git a/src/apps/wallet/get_address.py b/src/apps/wallet/get_address.py
index 72ddd7b2e..f9e740d8c 100644
--- a/src/apps/wallet/get_address.py
+++ b/src/apps/wallet/get_address.py
@@ -1,7 +1,8 @@
 from trezor.messages import InputScriptType
 from trezor.messages.Address import Address
+
 from apps.common import coins, seed
-from apps.common.display_address import show_qr, show_address
+from apps.common.display_address import show_address, show_qr
 from apps.wallet.sign_tx import addresses
 
 
diff --git a/src/apps/wallet/get_entropy.py b/src/apps/wallet/get_entropy.py
index 865772245..350631fad 100644
--- a/src/apps/wallet/get_entropy.py
+++ b/src/apps/wallet/get_entropy.py
@@ -2,6 +2,7 @@ from trezor.crypto import random
 from trezor.messages import ButtonRequestType
 from trezor.messages.Entropy import Entropy
 from trezor.ui.text import Text
+
 from apps.common.confirm import require_confirm
 
 
diff --git a/src/apps/wallet/get_public_key.py b/src/apps/wallet/get_public_key.py
index 3abcf9280..914ed9a81 100644
--- a/src/apps/wallet/get_public_key.py
+++ b/src/apps/wallet/get_public_key.py
@@ -1,12 +1,14 @@
-from trezor.messages.HDNodeType import HDNodeType
-from trezor.messages.PublicKey import PublicKey
+from ubinascii import hexlify
+
 from trezor import ui
 from trezor.messages import ButtonRequestType
+from trezor.messages.HDNodeType import HDNodeType
+from trezor.messages.PublicKey import PublicKey
 from trezor.ui.text import Text
 from trezor.utils import chunks
+
 from apps.common import coins, seed
 from apps.common.confirm import require_confirm
-from ubinascii import hexlify
 
 
 async def get_public_key(ctx, msg):
diff --git a/src/apps/wallet/sign_identity.py b/src/apps/wallet/sign_identity.py
index d661d24b5..020663bbb 100644
--- a/src/apps/wallet/sign_identity.py
+++ b/src/apps/wallet/sign_identity.py
@@ -3,10 +3,10 @@ from ustruct import pack, unpack
 from trezor import ui
 from trezor.crypto.hashlib import sha256
 from trezor.messages.SignedIdentity import SignedIdentity
-from trezor.utils import chunks
 from trezor.ui.text import Text
+from trezor.utils import chunks
 
-from apps.common import coins, seed, HARDENED
+from apps.common import HARDENED, coins, seed
 from apps.common.confirm import require_confirm
 
 
diff --git a/src/apps/wallet/sign_message.py b/src/apps/wallet/sign_message.py
index 1ff7b0e2f..7f3265f3b 100644
--- a/src/apps/wallet/sign_message.py
+++ b/src/apps/wallet/sign_message.py
@@ -3,6 +3,7 @@ from trezor.crypto.curve import secp256k1
 from trezor.messages.InputScriptType import SPENDADDRESS, SPENDP2SHWITNESS, SPENDWITNESS
 from trezor.messages.MessageSignature import MessageSignature
 from trezor.ui.text import Text
+
 from apps.common import coins, seed
 from apps.common.confirm import require_confirm
 from apps.common.signverify import message_digest, split_message
diff --git a/src/apps/wallet/sign_tx/__init__.py b/src/apps/wallet/sign_tx/__init__.py
index 47749667c..24d889a6c 100644
--- a/src/apps/wallet/sign_tx/__init__.py
+++ b/src/apps/wallet/sign_tx/__init__.py
@@ -1,16 +1,22 @@
 from trezor import ui, wire
 from trezor.messages.MessageType import TxAck
-from trezor.messages.TxRequest import TxRequest
 from trezor.messages.RequestType import TXFINISHED
-from apps.common import seed, coins
-from apps.wallet.sign_tx.helpers import UiConfirmOutput, UiConfirmTotal, UiConfirmFeeOverThreshold, UiConfirmForeignAddress
+from trezor.messages.TxRequest import TxRequest
+
+from apps.common import coins, seed
+from apps.wallet.sign_tx.helpers import (
+    UiConfirmFeeOverThreshold,
+    UiConfirmForeignAddress,
+    UiConfirmOutput,
+    UiConfirmTotal,
+)
 
 
 @ui.layout
 async def sign_tx(ctx, msg):
     from apps.wallet.sign_tx import layout, progress, signing
 
-    coin_name = msg.coin_name or 'Bitcoin'
+    coin_name = msg.coin_name or "Bitcoin"
     coin = coins.by_name(coin_name)
     # TODO: rework this so we don't have to pass root to signing.sign_tx
     root = await seed.derive_node(ctx, [], curve_name=coin.curve_name)
@@ -46,5 +52,5 @@ async def sign_tx(ctx, msg):
         elif isinstance(req, UiConfirmForeignAddress):
             res = await layout.confirm_foreign_address(ctx, req.address_n, req.coin)
         else:
-            raise TypeError('Invalid signing instruction')
+            raise TypeError("Invalid signing instruction")
     return req
diff --git a/src/apps/wallet/sign_tx/addresses.py b/src/apps/wallet/sign_tx/addresses.py
index 077885b64..d532e7f99 100644
--- a/src/apps/wallet/sign_tx/addresses.py
+++ b/src/apps/wallet/sign_tx/addresses.py
@@ -1,16 +1,18 @@
 from micropython import const
 
-from trezor.crypto.hashlib import sha256, ripemd160
 from trezor.crypto import base58, bech32, cashaddr
+from trezor.crypto.hashlib import ripemd160, sha256
+from trezor.messages import FailureType, InputScriptType
 from trezor.utils import ensure
 
-from trezor.messages import FailureType
-from trezor.messages import InputScriptType
-
-from apps.common.coininfo import CoinInfo
 from apps.common.address_type import addrtype_bytes
-from apps.wallet.sign_tx.scripts import output_script_multisig, sha256_ripemd160_digest, output_script_native_p2wpkh_or_p2wsh
-from apps.wallet.sign_tx.multisig import multisig_pubkey_index, multisig_get_pubkeys
+from apps.common.coininfo import CoinInfo
+from apps.wallet.sign_tx.multisig import multisig_get_pubkeys, multisig_pubkey_index
+from apps.wallet.sign_tx.scripts import (
+    output_script_multisig,
+    output_script_native_p2wpkh_or_p2wsh,
+    sha256_ripemd160_digest,
+)
 
 # supported witness version for bech32 addresses
 _BECH32_WITVER = const(0x00)
diff --git a/src/apps/wallet/sign_tx/helpers.py b/src/apps/wallet/sign_tx/helpers.py
index 81689331a..0d946b523 100644
--- a/src/apps/wallet/sign_tx/helpers.py
+++ b/src/apps/wallet/sign_tx/helpers.py
@@ -1,11 +1,17 @@
-from trezor.messages.TxOutputType import TxOutputType
-from trezor.messages.TxOutputBinType import TxOutputBinType
-from trezor.messages.TxInputType import TxInputType
+from trezor.messages import InputScriptType
+from trezor.messages.RequestType import (
+    TXEXTRADATA,
+    TXFINISHED,
+    TXINPUT,
+    TXMETA,
+    TXOUTPUT,
+)
 from trezor.messages.SignTx import SignTx
-from trezor.messages.TxRequest import TxRequest
 from trezor.messages.TransactionType import TransactionType
-from trezor.messages.RequestType import TXINPUT, TXOUTPUT, TXMETA, TXEXTRADATA, TXFINISHED
-from trezor.messages import InputScriptType
+from trezor.messages.TxInputType import TxInputType
+from trezor.messages.TxOutputBinType import TxOutputBinType
+from trezor.messages.TxOutputType import TxOutputType
+from trezor.messages.TxRequest import TxRequest
 
 from apps.common.coininfo import CoinInfo
 
diff --git a/src/apps/wallet/sign_tx/layout.py b/src/apps/wallet/sign_tx/layout.py
index 8ad9e9c9b..523289d0f 100644
--- a/src/apps/wallet/sign_tx/layout.py
+++ b/src/apps/wallet/sign_tx/layout.py
@@ -1,11 +1,11 @@
 from ubinascii import hexlify
+
 from trezor import ui
-from trezor.utils import chunks, format_amount
+from trezor.messages import ButtonRequestType, OutputScriptType
 from trezor.ui.text import Text
-from trezor.messages import ButtonRequestType
-from trezor.messages import OutputScriptType
-from apps.common.confirm import confirm
-from apps.common.confirm import hold_to_confirm
+from trezor.utils import chunks, format_amount
+
+from apps.common.confirm import confirm, hold_to_confirm
 from apps.wallet.sign_tx import addresses
 
 
diff --git a/src/apps/wallet/sign_tx/multisig.py b/src/apps/wallet/sign_tx/multisig.py
index ffb720536..a9aa1804c 100644
--- a/src/apps/wallet/sign_tx/multisig.py
+++ b/src/apps/wallet/sign_tx/multisig.py
@@ -1,10 +1,9 @@
-from trezor.crypto.hashlib import sha256
 from trezor.crypto import bip32
-from trezor.utils import HashWriter
-
-from trezor.messages.MultisigRedeemScriptType import MultisigRedeemScriptType
-from trezor.messages.HDNodePathType import HDNodePathType
+from trezor.crypto.hashlib import sha256
 from trezor.messages import FailureType
+from trezor.messages.HDNodePathType import HDNodePathType
+from trezor.messages.MultisigRedeemScriptType import MultisigRedeemScriptType
+from trezor.utils import HashWriter
 
 from apps.wallet.sign_tx.writers import write_bytes, write_uint32
 
diff --git a/src/apps/wallet/sign_tx/overwinter_zip143.py b/src/apps/wallet/sign_tx/overwinter_zip143.py
index 553a0aa12..4b2e03da4 100644
--- a/src/apps/wallet/sign_tx/overwinter_zip143.py
+++ b/src/apps/wallet/sign_tx/overwinter_zip143.py
@@ -1,17 +1,24 @@
 from micropython import const
 
 from trezor.crypto.hashlib import blake2b
+from trezor.messages import FailureType, InputScriptType
 from trezor.messages.SignTx import SignTx
 from trezor.messages.TxInputType import TxInputType
 from trezor.messages.TxOutputBinType import TxOutputBinType
-from trezor.messages import InputScriptType, FailureType
 from trezor.utils import HashWriter
 
 from apps.common.coininfo import CoinInfo
-from apps.wallet.sign_tx.writers import write_bytes, write_bytes_rev, write_uint32, write_uint64, write_varint, write_tx_output, get_tx_hash
-from apps.wallet.sign_tx.scripts import output_script_p2pkh, output_script_multisig
 from apps.wallet.sign_tx.multisig import multisig_get_pubkeys
-
+from apps.wallet.sign_tx.scripts import output_script_multisig, output_script_p2pkh
+from apps.wallet.sign_tx.writers import (
+    get_tx_hash,
+    write_bytes,
+    write_bytes_rev,
+    write_tx_output,
+    write_uint32,
+    write_uint64,
+    write_varint,
+)
 
 OVERWINTERED = const(0x80000000)
 
diff --git a/src/apps/wallet/sign_tx/scripts.py b/src/apps/wallet/sign_tx/scripts.py
index 8fd5ed2bd..568251291 100644
--- a/src/apps/wallet/sign_tx/scripts.py
+++ b/src/apps/wallet/sign_tx/scripts.py
@@ -1,7 +1,14 @@
 from trezor.crypto.hashlib import ripemd160, sha256
 from trezor.messages.MultisigRedeemScriptType import MultisigRedeemScriptType
+
 from apps.wallet.sign_tx.multisig import multisig_get_pubkeys
-from apps.wallet.sign_tx.writers import bytearray_with_cap, write_bytes, write_varint, write_op_push, write_scriptnum
+from apps.wallet.sign_tx.writers import (
+    bytearray_with_cap,
+    write_bytes,
+    write_op_push,
+    write_scriptnum,
+    write_varint,
+)
 
 
 class ScriptsError(ValueError):
@@ -13,7 +20,9 @@ class ScriptsError(ValueError):
 # https://github.com/bitcoin/bips/blob/master/bip-0016.mediawiki
 
 
-def input_script_p2pkh_or_p2sh(pubkey: bytes, signature: bytes, sighash: int) -> bytearray:
+def input_script_p2pkh_or_p2sh(
+    pubkey: bytes, signature: bytes, sighash: int
+) -> bytearray:
     w = bytearray_with_cap(5 + len(signature) + 1 + 5 + len(pubkey))
     append_signature(w, signature, sighash)
     append_pubkey(w, pubkey)
@@ -116,7 +125,7 @@ def input_script_p2wsh_in_p2sh(script_hash: bytes) -> bytearray:
     # Signature is moved to the witness.
 
     if len(script_hash) != 32:
-        raise ScriptsError('Redeem script hash should be 32 bytes long')
+        raise ScriptsError("Redeem script hash should be 32 bytes long")
 
     w = bytearray_with_cap(3 + len(script_hash))
     w.append(0x22)  # length of the data
@@ -138,10 +147,15 @@ def witness_p2wpkh(signature: bytes, pubkey: bytes, sighash: int):
     return w
 
 
-def witness_p2wsh(multisig: MultisigRedeemScriptType, signature: bytes, signature_index: int, sighash: int):
+def witness_p2wsh(
+    multisig: MultisigRedeemScriptType,
+    signature: bytes,
+    signature_index: int,
+    sighash: int,
+):
     signatures = multisig.signatures  # other signatures
     if len(signatures[signature_index]) > 0:
-        raise ScriptsError('Invalid multisig parameters')
+        raise ScriptsError("Invalid multisig parameters")
     signatures[signature_index] = signature  # our signature
 
     # filter empty
@@ -171,10 +185,15 @@ def witness_p2wsh(multisig: MultisigRedeemScriptType, signature: bytes, signatur
 # Used either as P2SH, P2WSH, or P2WSH nested in P2SH.
 
 
-def input_script_multisig(multisig: MultisigRedeemScriptType, signature: bytes, signature_index: int, sighash: int):
+def input_script_multisig(
+    multisig: MultisigRedeemScriptType,
+    signature: bytes,
+    signature_index: int,
+    sighash: int,
+):
     signatures = multisig.signatures  # other signatures
     if len(signatures[signature_index]) > 0:
-        raise ScriptsError('Invalid multisig parameters')
+        raise ScriptsError("Invalid multisig parameters")
     signatures[signature_index] = signature  # our signature
 
     w = bytearray()
@@ -199,10 +218,10 @@ def input_script_multisig(multisig: MultisigRedeemScriptType, signature: bytes,
 def output_script_multisig(pubkeys, m: int) -> bytearray:
     n = len(pubkeys)
     if n < 1 or n > 15 or m < 1 or m > 15:
-        raise ScriptsError('Invalid multisig parameters')
+        raise ScriptsError("Invalid multisig parameters")
     for pubkey in pubkeys:
         if len(pubkey) != 33:
-            raise ScriptsError('Invalid multisig parameters')
+            raise ScriptsError("Invalid multisig parameters")
 
     w = bytearray()
     w.append(0x50 + m)  # numbers 1 to 16 are pushed as 0x50 + value
diff --git a/src/apps/wallet/sign_tx/segwit_bip143.py b/src/apps/wallet/sign_tx/segwit_bip143.py
index 548fe5953..63ed06b90 100644
--- a/src/apps/wallet/sign_tx/segwit_bip143.py
+++ b/src/apps/wallet/sign_tx/segwit_bip143.py
@@ -1,14 +1,22 @@
 from trezor.crypto.hashlib import sha256
+from trezor.messages import FailureType, InputScriptType
 from trezor.messages.SignTx import SignTx
 from trezor.messages.TxInputType import TxInputType
 from trezor.messages.TxOutputBinType import TxOutputBinType
-from trezor.messages import InputScriptType, FailureType
 from trezor.utils import HashWriter
 
 from apps.common.coininfo import CoinInfo
-from apps.wallet.sign_tx.writers import write_bytes, write_bytes_rev, write_uint32, write_uint64, write_varint, write_tx_output, get_tx_hash
-from apps.wallet.sign_tx.scripts import output_script_p2pkh, output_script_multisig
 from apps.wallet.sign_tx.multisig import multisig_get_pubkeys
+from apps.wallet.sign_tx.scripts import output_script_multisig, output_script_p2pkh
+from apps.wallet.sign_tx.writers import (
+    get_tx_hash,
+    write_bytes,
+    write_bytes_rev,
+    write_tx_output,
+    write_uint32,
+    write_uint64,
+    write_varint,
+)
 
 
 class Bip143Error(ValueError):
diff --git a/src/apps/wallet/sign_tx/signing.py b/src/apps/wallet/sign_tx/signing.py
index 3fd5cc206..67bad7a79 100644
--- a/src/apps/wallet/sign_tx/signing.py
+++ b/src/apps/wallet/sign_tx/signing.py
@@ -1,26 +1,28 @@
 from micropython import const
 
-from trezor.crypto import base58, bip32, der, cashaddr
+from trezor.crypto import base58, bip32, cashaddr, der
 from trezor.crypto.curve import secp256k1
 from trezor.crypto.hashlib import sha256
-from trezor.utils import HashWriter
-
 from trezor.messages import OutputScriptType
 from trezor.messages.TxRequestDetailsType import TxRequestDetailsType
 from trezor.messages.TxRequestSerializedType import TxRequestSerializedType
+from trezor.utils import HashWriter
 
 from apps.common import address_type, coins
 from apps.common.coininfo import CoinInfo
+from apps.wallet.sign_tx import progress
 from apps.wallet.sign_tx.addresses import *
 from apps.wallet.sign_tx.helpers import *
 from apps.wallet.sign_tx.multisig import *
+from apps.wallet.sign_tx.overwinter_zip143 import (  # noqa:F401
+    OVERWINTERED,
+    Zip143,
+    Zip143Error,
+)
 from apps.wallet.sign_tx.scripts import *
 from apps.wallet.sign_tx.segwit_bip143 import Bip143, Bip143Error  # noqa:F401
-from apps.wallet.sign_tx.overwinter_zip143 import Zip143, Zip143Error, OVERWINTERED  # noqa:F401
 from apps.wallet.sign_tx.tx_weight_calculator import *
 from apps.wallet.sign_tx.writers import *
-from apps.wallet.sign_tx import progress
-
 
 # the number of bip32 levels used in a wallet (chain and address)
 _BIP32_WALLET_DEPTH = const(2)
diff --git a/src/apps/wallet/sign_tx/writers.py b/src/apps/wallet/sign_tx/writers.py
index a59e72a7e..192abde43 100644
--- a/src/apps/wallet/sign_tx/writers.py
+++ b/src/apps/wallet/sign_tx/writers.py
@@ -2,7 +2,6 @@ from trezor.crypto.hashlib import sha256
 from trezor.messages.TxInputType import TxInputType
 from trezor.messages.TxOutputBinType import TxOutputBinType
 
-
 # TX Serialization
 # ===
 
diff --git a/src/apps/wallet/verify_message.py b/src/apps/wallet/verify_message.py
index f6e4c4efd..766ef8a09 100644
--- a/src/apps/wallet/verify_message.py
+++ b/src/apps/wallet/verify_message.py
@@ -3,11 +3,18 @@ from trezor.crypto.curve import secp256k1
 from trezor.messages.InputScriptType import SPENDADDRESS, SPENDP2SHWITNESS, SPENDWITNESS
 from trezor.messages.Success import Success
 from trezor.ui.text import Text
+
 from apps.common import coins
 from apps.common.confirm import require_confirm
 from apps.common.display_address import split_address
 from apps.common.signverify import message_digest, split_message
-from apps.wallet.sign_tx.addresses import address_pkh, address_p2wpkh_in_p2sh, address_p2wpkh, address_to_cashaddr, address_short
+from apps.wallet.sign_tx.addresses import (
+    address_p2wpkh,
+    address_p2wpkh_in_p2sh,
+    address_pkh,
+    address_short,
+    address_to_cashaddr,
+)
 
 
 async def verify_message(ctx, msg):
diff --git a/src/boot.py b/src/boot.py
index 751c490f1..fa59913a3 100644
--- a/src/boot.py
+++ b/src/boot.py
@@ -1,5 +1,6 @@
 from trezor import config, loop, res, ui
 from trezor.pin import pin_to_int, show_pin_timeout
+
 from apps.common.request_pin import request_pin
 
 
diff --git a/src/trezor/__init__.py b/src/trezor/__init__.py
index ddf3109ce..80c7ec815 100644
--- a/src/trezor/__init__.py
+++ b/src/trezor/__init__.py
@@ -1,2 +1,2 @@
 import trezorconfig as config  # noqa: F401
-import trezorio as io          # noqa: F401
+import trezorio as io  # noqa: F401
diff --git a/src/trezor/crypto/__init__.py b/src/trezor/crypto/__init__.py
index 1041d98cf..7eb67a3d9 100644
--- a/src/trezor/crypto/__init__.py
+++ b/src/trezor/crypto/__init__.py
@@ -1 +1,10 @@
-from trezorcrypto import bip32, bip39, chacha20poly1305, crc, pbkdf2, random, rfc6979, nem  # noqa: F401
+from trezorcrypto import (  # noqa: F401
+    bip32,
+    bip39,
+    chacha20poly1305,
+    crc,
+    nem,
+    pbkdf2,
+    random,
+    rfc6979,
+)
diff --git a/src/trezor/crypto/base32.py b/src/trezor/crypto/base32.py
index 0c6bf47e5..b70b4a9d8 100644
--- a/src/trezor/crypto/base32.py
+++ b/src/trezor/crypto/base32.py
@@ -5,7 +5,6 @@
 from ubinascii import unhexlify
 from ustruct import unpack
 
-
 _b32alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567'
 
 _b32tab = [ord(c) for c in _b32alphabet]
diff --git a/src/trezor/crypto/hashlib.py b/src/trezor/crypto/hashlib.py
index 526adfd7a..388c004db 100644
--- a/src/trezor/crypto/hashlib.py
+++ b/src/trezor/crypto/hashlib.py
@@ -1 +1,12 @@
-from trezorcrypto import blake256, blake2b, blake2s, groestl512, ripemd160, sha1, sha256, sha512, sha3_256, sha3_512  # noqa: F401
+from trezorcrypto import (  # noqa: F401
+    blake2b,
+    blake2s,
+    blake256,
+    groestl512,
+    ripemd160,
+    sha1,
+    sha3_256,
+    sha3_512,
+    sha256,
+    sha512,
+)
diff --git a/src/trezor/log.py b/src/trezor/log.py
index 4a4f40a0b..1c5f47c07 100644
--- a/src/trezor/log.py
+++ b/src/trezor/log.py
@@ -1,6 +1,6 @@
-from micropython import const
 import sys
 import utime
+from micropython import const
 
 NOTSET = const(0)
 DEBUG = const(10)
diff --git a/src/trezor/loop.py b/src/trezor/loop.py
index e6c9939cb..c1dc6c450 100644
--- a/src/trezor/loop.py
+++ b/src/trezor/loop.py
@@ -10,8 +10,8 @@ See `schedule`, `run`, and syscalls `sleep`, `wait`, `signal` and `spawn`.
 import utime
 import utimeq
 from micropython import const
-from trezor import log
-from trezor import io
+
+from trezor import io, log
 
 after_step_hook = None  # function, called after each task step
 
diff --git a/src/trezor/ui/button.py b/src/trezor/ui/button.py
index f51ade51d..2e25cee88 100644
--- a/src/trezor/ui/button.py
+++ b/src/trezor/ui/button.py
@@ -1,12 +1,7 @@
 from micropython import const
 
-from trezor import io
-from trezor import ui
-
-from trezor.ui import contains
-from trezor.ui import display
-from trezor.ui import rotate
-from trezor.ui import LazyWidget
+from trezor import io, ui
+from trezor.ui import LazyWidget, contains, display, rotate
 
 # button events
 BTN_CLICKED = const(1)
diff --git a/src/trezor/ui/confirm.py b/src/trezor/ui/confirm.py
index d27fd35ce..5e1227e6e 100644
--- a/src/trezor/ui/confirm.py
+++ b/src/trezor/ui/confirm.py
@@ -1,4 +1,5 @@
 from micropython import const
+
 from trezor import loop, res, ui
 from trezor.ui import Widget
 from trezor.ui.button import BTN_ACTIVE, BTN_CLICKED, Button
diff --git a/src/trezor/ui/entry_select.py b/src/trezor/ui/entry_select.py
index ea464cc8c..42531953d 100644
--- a/src/trezor/ui/entry_select.py
+++ b/src/trezor/ui/entry_select.py
@@ -1,8 +1,8 @@
 from micropython import const
-from trezor import loop
-from trezor import ui
+
+from trezor import loop, ui
 from trezor.ui import Widget
-from trezor.ui.button import Button, BTN_CLICKED
+from trezor.ui.button import BTN_CLICKED, Button
 
 DEVICE = const(0)
 HOST = const(1)
diff --git a/src/trezor/ui/loader.py b/src/trezor/ui/loader.py
index 601b6760c..d16531ddc 100644
--- a/src/trezor/ui/loader.py
+++ b/src/trezor/ui/loader.py
@@ -1,5 +1,6 @@
 import utime
 from micropython import const
+
 from trezor import loop, res, ui
 
 _TARGET_MS = const(1000)
diff --git a/src/trezor/ui/passphrase.py b/src/trezor/ui/passphrase.py
index aa139ec3c..a3ea4f32c 100644
--- a/src/trezor/ui/passphrase.py
+++ b/src/trezor/ui/passphrase.py
@@ -1,5 +1,6 @@
 from micropython import const
-from trezor import io, loop, ui, res
+
+from trezor import io, loop, res, ui
 from trezor.ui import display
 from trezor.ui.button import BTN_CLICKED, Button
 from trezor.ui.swipe import SWIPE_HORIZONTAL, SWIPE_LEFT, Swipe
diff --git a/src/trezor/ui/pin.py b/src/trezor/ui/pin.py
index 37da9eaa8..8b1cd36aa 100644
--- a/src/trezor/ui/pin.py
+++ b/src/trezor/ui/pin.py
@@ -1,8 +1,9 @@
 from micropython import const
+
 from trezor import ui
 from trezor.crypto import random
 from trezor.ui import display
-from trezor.ui.button import Button, BTN_CLICKED
+from trezor.ui.button import BTN_CLICKED, Button
 
 
 def digit_area(i):
diff --git a/src/trezor/ui/scroll.py b/src/trezor/ui/scroll.py
index e582efa6c..6594affef 100644
--- a/src/trezor/ui/scroll.py
+++ b/src/trezor/ui/scroll.py
@@ -1,6 +1,7 @@
 from micropython import const
-from trezor import loop, ui, res
-from trezor.ui.swipe import Swipe, SWIPE_UP, SWIPE_DOWN, SWIPE_VERTICAL
+
+from trezor import loop, res, ui
+from trezor.ui.swipe import SWIPE_DOWN, SWIPE_UP, SWIPE_VERTICAL, Swipe
 
 if __debug__:
     from apps.debug import swipe_signal
diff --git a/src/trezor/ui/style.py b/src/trezor/ui/style.py
index 7342ecc16..f3722fc3a 100644
--- a/src/trezor/ui/style.py
+++ b/src/trezor/ui/style.py
@@ -1,6 +1,6 @@
 from micropython import const
-from trezor.ui import rgb
-from trezor.ui import NORMAL, BOLD, MONO
+
+from trezor.ui import BOLD, MONO, NORMAL, rgb
 
 # radius for buttons and other elements
 RADIUS = const(2)
diff --git a/src/trezor/ui/swipe.py b/src/trezor/ui/swipe.py
index 70c775e5d..941c2cb3a 100644
--- a/src/trezor/ui/swipe.py
+++ b/src/trezor/ui/swipe.py
@@ -1,4 +1,5 @@
 from micropython import const
+
 from trezor import io, ui
 from trezor.ui import contains, rotate
 
diff --git a/src/trezor/ui/text.py b/src/trezor/ui/text.py
index fa20ffb41..60a0b9a1b 100644
--- a/src/trezor/ui/text.py
+++ b/src/trezor/ui/text.py
@@ -1,4 +1,5 @@
 from micropython import const
+
 from trezor import ui
 
 TEXT_HEADER_HEIGHT = const(48)
diff --git a/src/trezor/ui/word_select.py b/src/trezor/ui/word_select.py
index 96aa97bc4..49963f9a4 100644
--- a/src/trezor/ui/word_select.py
+++ b/src/trezor/ui/word_select.py
@@ -1,4 +1,5 @@
 from micropython import const
+
 from trezor import loop, ui
 from trezor.ui import Widget
 from trezor.ui.button import BTN_CLICKED, Button
diff --git a/src/trezor/utils.py b/src/trezor/utils.py
index 9ff4f381e..abef8828c 100644
--- a/src/trezor/utils.py
+++ b/src/trezor/utils.py
@@ -1,7 +1,6 @@
-import sys
 import gc
-
-from trezorutils import halt, memcpy, set_mode_unprivileged, symbol, model  # noqa: F401
+import sys
+from trezorutils import halt, memcpy, model, set_mode_unprivileged, symbol  # noqa: F401
 
 
 def unimport_begin():
diff --git a/src/trezor/wire/codec_v1.py b/src/trezor/wire/codec_v1.py
index de0e5c796..dae134d71 100644
--- a/src/trezor/wire/codec_v1.py
+++ b/src/trezor/wire/codec_v1.py
@@ -1,9 +1,7 @@
-from micropython import const
 import ustruct
+from micropython import const
 
-from trezor import io
-from trezor import loop
-from trezor import utils
+from trezor import io, loop, utils
 
 _REP_LEN = const(64)