diff --git a/examples/test_client.py b/examples/test_client.py
index 852541d..1fbdff5 100644
--- a/examples/test_client.py
+++ b/examples/test_client.py
@@ -1,14 +1,12 @@
 import os
-import yaml
-
 from asyncio import get_event_loop
 from base64 import b64decode
 
+import yaml
 from nacl.signing import SigningKey
 
 from secret_handshake import SHSClient
 
-
 with open(os.path.expanduser('~/.ssb/secret')) as f:
     config = yaml.load(f)
 
diff --git a/examples/test_server.py b/examples/test_server.py
index 1d0399e..cc9c616 100644
--- a/examples/test_server.py
+++ b/examples/test_server.py
@@ -1,14 +1,12 @@
 import os
-import yaml
-
 from asyncio import get_event_loop
 from base64 import b64decode
 
+import yaml
 from nacl.signing import SigningKey
 
 from secret_handshake import SHSServer
 
-
 with open(os.path.expanduser('~/.ssb/secret')) as f:
     config = yaml.load(f)
 
diff --git a/secret_handshake/boxstream.py b/secret_handshake/boxstream.py
index af948cf..04a42a1 100644
--- a/secret_handshake/boxstream.py
+++ b/secret_handshake/boxstream.py
@@ -2,10 +2,9 @@ import struct
 from asyncio import IncompleteReadError
 
 from async_generator import async_generator, yield_
-
 from nacl.secret import SecretBox
 
-from .util import split_chunks, inc_nonce
+from .util import inc_nonce, split_chunks
 
 HEADER_LENGTH = 2 + 16 + 16
 MAX_SEGMENT_SIZE = 4 * 1024
diff --git a/secret_handshake/crypto.py b/secret_handshake/crypto.py
index dc8f2db..05b1315 100644
--- a/secret_handshake/crypto.py
+++ b/secret_handshake/crypto.py
@@ -23,7 +23,8 @@ import hashlib
 import hmac
 from base64 import b64decode
 
-from nacl.bindings import crypto_scalarmult, crypto_box_afternm, crypto_box_open_afternm
+from nacl.bindings import (crypto_box_afternm, crypto_box_open_afternm,
+                           crypto_scalarmult)
 from nacl.exceptions import CryptoError
 from nacl.public import PrivateKey
 from nacl.signing import VerifyKey
diff --git a/secret_handshake/test_boxstream.py b/secret_handshake/test_boxstream.py
index fc0ad98..d035b58 100644
--- a/secret_handshake/test_boxstream.py
+++ b/secret_handshake/test_boxstream.py
@@ -21,10 +21,11 @@
 
 import pytest
 
-from .test_crypto import (CLIENT_ENCRYPT_KEY, CLIENT_ENCRYPT_NONCE)
-from secret_handshake.boxstream import BoxStream, UnboxStream, HEADER_LENGTH
+from secret_handshake.boxstream import HEADER_LENGTH, BoxStream, UnboxStream
 from secret_handshake.util import AsyncBuffer, async_comprehend
 
+from .test_crypto import CLIENT_ENCRYPT_KEY, CLIENT_ENCRYPT_NONCE
+
 MESSAGE_1 = (b'\xcev\xedE\x06l\x02\x13\xc8\x17V\xfa\x8bZ?\x88B%O\xb0L\x9f\x8e\x8c0y\x1dv\xc0\xc9\xf6\x9d\xc2\xdf\xdb'
              b'\xee\x9d')
 MESSAGE_2 = b"\x141\xd63\x13d\xd1\xecZ\x9b\xd0\xd4\x03\xcdR?'\xaa.\x89I\x92I\xf9guL\xaa\x06?\xea\xca/}\x88*\xb2"
diff --git a/secret_handshake/util.py b/secret_handshake/util.py
index d0df4bd..0b4667e 100644
--- a/secret_handshake/util.py
+++ b/secret_handshake/util.py
@@ -22,7 +22,6 @@
 import struct
 from io import BytesIO
 
-
 NONCE_SIZE = 24
 MAX_NONCE = (8 * NONCE_SIZE)