diff --git a/src/trezor/config.py b/src/trezor/config.py
index f9df21944..6462774a0 100644
--- a/src/trezor/config.py
+++ b/src/trezor/config.py
@@ -2,6 +2,7 @@ from TrezorConfig import Config
 
 _config = Config()
 
+
 def get(app: int, key: int) -> bytes:
     return _config.get(app, key)
 
diff --git a/src/trezor/crypto/der.py b/src/trezor/crypto/der.py
index 6019116e1..a6e1bc618 100644
--- a/src/trezor/crypto/der.py
+++ b/src/trezor/crypto/der.py
@@ -1,12 +1,14 @@
+
 def encode_length(l: int) -> bytes:
     if l < 0x80:
-       return bytes([l])
+        return bytes([l])
     elif l <= 0xFF:
-       return bytes([0x81, l])
+        return bytes([0x81, l])
     elif l <= 0xFFFF:
-       return bytes([0x82, l & 0xFF, l >> 8])
+        return bytes([0x82, l & 0xFF, l >> 8])
     else:
-       raise ValueError
+        raise ValueError
+
 
 def encode_int(i: bytes) -> bytes:
     i = i.lstrip(b'\x00')
@@ -14,6 +16,7 @@ def encode_int(i: bytes) -> bytes:
         i = b'\x00' + i
     return b'\x02' + encode_length(len(i)) + i
 
+
 def encode_seq(seq: tuple) -> bytes:
     res = b''
     for i in seq:
diff --git a/src/trezor/crypto/hmac.py b/src/trezor/crypto/hmac.py
index dc4db4295..db1b9916a 100644
--- a/src/trezor/crypto/hmac.py
+++ b/src/trezor/crypto/hmac.py
@@ -1,8 +1,3 @@
-def new(key, msg, digestmod) -> Hmac:
-    '''
-    Creates a HMAC context object.
-    '''
-    return Hmac(key, msg, digestmod)
 
 class Hmac:
     def __init__(self, key, msg, digestmod):
@@ -33,3 +28,8 @@ class Hmac:
         return outer.digest()
 
 
+def new(key, msg, digestmod) -> Hmac:
+    '''
+    Creates a HMAC context object.
+    '''
+    return Hmac(key, msg, digestmod)
diff --git a/src/trezor/crypto/rlp.py b/src/trezor/crypto/rlp.py
index 4105ddfc6..0e5ba5d2e 100644
--- a/src/trezor/crypto/rlp.py
+++ b/src/trezor/crypto/rlp.py
@@ -1,3 +1,4 @@
+
 def int_to_bytes(x: int) -> bytes:
     if x == 0:
         return b''
@@ -7,15 +8,17 @@ def int_to_bytes(x: int) -> bytes:
         x //= 256
     return bytes(reversed(r))
 
+
 def encode_length(l: int, is_list: bool) -> bytes:
     offset = 0xC0 if is_list else 0x80
     if l < 56:
-         return bytes([l + offset])
+        return bytes([l + offset])
     elif l < 256 ** 8:
-         bl = int_to_bytes(l)
-         return bytes([len(bl) + offset + 55]) + bl
+        bl = int_to_bytes(l)
+        return bytes([len(bl) + offset + 55]) + bl
     else:
-         raise ValueError('Input too long')
+        raise ValueError('Input too long')
+
 
 def encode(data) -> bytes:
     if isinstance(data, int):
diff --git a/src/trezor/ui/loader.py b/src/trezor/ui/loader.py
index cce79a10f..1c53718c3 100644
--- a/src/trezor/ui/loader.py
+++ b/src/trezor/ui/loader.py
@@ -19,7 +19,7 @@ DEFAULT_LOADER_ACTIVE = {
 _LOADER_MSEC = const(1000)
 
 
-class Loader():
+class Loader:
 
     def __init__(self, normal_style=None, active_style=None):
         self.start_ticks_ms = None
diff --git a/src/trezor/ui/pin.py b/src/trezor/ui/pin.py
index 028606a13..7c4f79959 100644
--- a/src/trezor/ui/pin.py
+++ b/src/trezor/ui/pin.py
@@ -1,8 +1,8 @@
 from micropython import const
-from trezor.crypto import random
 from trezor import ui, res
-from .button import Button, BTN_CLICKED, CLEAR_BUTTON, CLEAR_BUTTON_ACTIVE
-from . import display
+from trezor.crypto import random
+from trezor.ui import display
+from treozr.ui.button import Button, BTN_CLICKED, CLEAR_BUTTON, CLEAR_BUTTON_ACTIVE
 
 
 def digit_area(i):
diff --git a/src/trezor/ui/scroll.py b/src/trezor/ui/scroll.py
index 201511794..8f408c7cc 100644
--- a/src/trezor/ui/scroll.py
+++ b/src/trezor/ui/scroll.py
@@ -48,5 +48,6 @@ def render_scrollbar(page, page_count):
     for i in range(0, page_count):
         if i != page:
             ui.display.bar_radius(x, y + i * padding, size,
-                           size, ui.DARK_GREY, ui.BLACK, 4)
-    ui.display.bar_radius(x, y + page * padding, size, size, ui.WHITE, ui.BLACK, 4)
+                                  size, ui.DARK_GREY, ui.BLACK, 4)
+    ui.display.bar_radius(x, y + page * padding, size,
+                          size, ui.WHITE, ui.BLACK, 4)
diff --git a/src/trezor/utils.py b/src/trezor/utils.py
index 2f6e958f0..4ec0d830a 100644
--- a/src/trezor/utils.py
+++ b/src/trezor/utils.py
@@ -16,7 +16,6 @@ def _unimport_func(func):
         finally:
             for mod in sys.modules:
                 if mod not in mods:
-                    log.debug(__name__, 'unimport %s', mod)
                     del sys.modules[mod]
             gc.collect()
         return ret
@@ -31,7 +30,6 @@ def _unimport_genfunc(genfunc):
         finally:
             for mod in sys.modules:
                 if mod not in mods:
-                    log.debug(__name__, 'unimport %s', mod)
                     del sys.modules[mod]
             gc.collect()
         return ret