diff --git a/graphenebase/account.py b/graphenebase/account.py
index 15d48489..82e2b5ec 100644
--- a/graphenebase/account.py
+++ b/graphenebase/account.py
@@ -452,8 +452,8 @@ def derive_from_seed(self, offset):
         order = ecdsa.SECP256k1.order
         secexp = (seed + z) % order
         secret = "%0x" % secexp
-        if len(secret) < 64: # left-pad with zeroes
-            secret = ("0" * (64-len(secret))) + secret
+        if len(secret) < 64:  # left-pad with zeroes
+            secret = ("0" * (64 - len(secret))) + secret
         return PrivateKey(secret, prefix=self.pubkey.prefix)
 
     def __format__(self, _format):
diff --git a/graphenebase/ecdsa.py b/graphenebase/ecdsa.py
index 8233693b..ee4a22de 100644
--- a/graphenebase/ecdsa.py
+++ b/graphenebase/ecdsa.py
@@ -208,7 +208,7 @@ def sign_message(message, wif, hashfn=hashlib.sha256):
             sigder = bytearray(sigder)
             lenR = sigder[3]
             lenS = sigder[5 + lenR]
-            if lenR is 32 and lenS is 32:
+            if lenR == 32 and lenS == 32:
                 # Derive the recovery parameter
                 #
                 i = recoverPubkeyParameter(message, digest, signature, public_key)
@@ -254,7 +254,7 @@ def sign_message(message, wif, hashfn=hashlib.sha256):
             sigder = bytearray(sigder)
             lenR = sigder[3]
             lenS = sigder[5 + lenR]
-            if lenR is 32 and lenS is 32:
+            if lenR == 32 and lenS == 32:
                 # Derive the recovery parameter
                 #
                 i = recoverPubkeyParameter(
diff --git a/graphenestorage/sqlite.py b/graphenestorage/sqlite.py
index edab327d..2274bc03 100644
--- a/graphenestorage/sqlite.py
+++ b/graphenestorage/sqlite.py
@@ -55,6 +55,7 @@ def __init__(self, *args, **kwargs):
         else:  # pragma: no cover
             os.makedirs(data_dir)
 
+
 class SQLiteCommon(object):
     """ This class abstracts away common sqlite3 operations.
 
@@ -65,6 +66,7 @@ class SQLiteCommon(object):
 
             * ``sqlite_file``: Path to the SQLite Database file
     """
+
     def sql_fetchone(self, query):
         connection = sqlite3.connect(self.sqlite_file)
         try:
@@ -91,7 +93,7 @@ def sql_execute(self, query, lastid=False):
             cursor = connection.cursor()
             cursor.execute(*query)
             connection.commit()
-        except:
+        except Exception:
             connection.close()
             raise
         ret = None
@@ -142,10 +144,10 @@ def _haveKey(self, key):
         """
         query = (
             "SELECT {} FROM {} WHERE {}=?".format(
-                self.__value__,
-                self.__tablename__,
-                self.__key__
-            ), (key,))
+                self.__value__, self.__tablename__, self.__key__
+            ),
+            (key,),
+        )
         return True if self.sql_fetchone(query) else False
 
     def __setitem__(self, key, value):
@@ -177,10 +179,10 @@ def __getitem__(self, key):
         """
         query = (
             "SELECT {} FROM {} WHERE {}=?".format(
-                self.__value__,
-                self.__tablename__,
-                self.__key__
-            ), (key,))
+                self.__value__, self.__tablename__, self.__key__
+            ),
+            (key,),
+        )
         result = self.sql_fetchone(query)
         if result:
             return result[0]
@@ -196,15 +198,13 @@ def __iter__(self):
         return iter(self.keys())
 
     def keys(self):
-        query = ("SELECT {} from {}".format(
-            self.__key__,
-            self.__tablename__), )
+        query = ("SELECT {} from {}".format(self.__key__, self.__tablename__),)
         return [x[0] for x in self.sql_fetchall(query)]
 
     def __len__(self):
         """ return lenght of store
         """
-        query = ("SELECT id from {}".format(self.__tablename__), )
+        query = ("SELECT id from {}".format(self.__tablename__),)
         return len(self.sql_fetchall(query))
 
     def __contains__(self, key):
@@ -222,10 +222,11 @@ def __contains__(self, key):
     def items(self):
         """ returns all items off the store as tuples
         """
-        query = ("SELECT {}, {} from {}".format(
-            self.__key__,
-            self.__value__,
-            self.__tablename__), )
+        query = (
+            "SELECT {}, {} from {}".format(
+                self.__key__, self.__value__, self.__tablename__
+            ),
+        )
         r = []
         for key, value in self.sql_fetchall(query):
             r.append((key, value))
@@ -249,39 +250,37 @@ def delete(self, key):
             :param str value: Value
         """
         query = (
-            "DELETE FROM {} WHERE {}=?".format(
-                self.__tablename__,
-                self.__key__
-            ), (key,))
+            "DELETE FROM {} WHERE {}=?".format(self.__tablename__, self.__key__),
+            (key,),
+        )
         self.sql_execute(query)
 
     def wipe(self):
         """ Wipe the store
         """
-        query = ("DELETE FROM {}".format(self.__tablename__), )
+        query = ("DELETE FROM {}".format(self.__tablename__),)
         self.sql_execute(query)
 
     def exists(self):
         """ Check if the database table exists
         """
-        query = ("SELECT name FROM sqlite_master " +
-                 "WHERE type='table' AND name=?",
-                 (self.__tablename__, ))
+        query = (
+            "SELECT name FROM sqlite_master " + "WHERE type='table' AND name=?",
+            (self.__tablename__,),
+        )
         return True if self.sql_fetchone(query) else False
 
     def create(self):  # pragma: no cover
         """ Create the new table in the SQLite database
         """
-        query = ((
-            """
+        query = (
+            (
+                """
             CREATE TABLE {} (
                 id INTEGER PRIMARY KEY AUTOINCREMENT,
                 {} STRING(256),
                 {} STRING(256)
             )"""
-        ).format(
-            self.__tablename__,
-            self.__key__,
-            self.__value__
-        ), )
+            ).format(self.__tablename__, self.__key__, self.__value__),
+        )
         self.sql_execute(query)