diff --git a/electrumx/server/db.py b/electrumx/server/db.py
index 6e82a52..89c8d5e 100644
--- a/electrumx/server/db.py
+++ b/electrumx/server/db.py
@@ -31,6 +31,7 @@ from electrumx.server.history import History
 
 UTXO = namedtuple("UTXO", "tx_num tx_pos tx_hash height value")
 
+
 @attr.s(slots=True)
 class FlushData(object):
     height = attr.ib()
@@ -43,6 +44,7 @@ class FlushData(object):
     deletes = attr.ib()
     tip = attr.ib()
 
+
 class DB(object):
     '''Simple wrapper of the backend database for querying.
 
diff --git a/electrumx/wallet/bip32.py b/electrumx/wallet/bip32.py
index 37ba2ed..e8c2274 100644
--- a/electrumx/wallet/bip32.py
+++ b/electrumx/wallet/bip32.py
@@ -271,6 +271,7 @@ def _exponent_to_bytes(exponent):
     '''Convert an exponent to 32 big-endian bytes'''
     return (bytes(32) + int_to_bytes(exponent))[-32:]
 
+
 def _from_extended_key(ekey):
     '''Return a PubKey or PrivKey from an extended key raw bytes.'''
     if not isinstance(ekey, (bytes, bytearray)):
@@ -295,6 +296,7 @@ def _from_extended_key(ekey):
 
     return key, coin
 
+
 def from_extended_key_string(ekey_str):
     '''Given an extended key string, such as