diff --git a/bigchaindb/web/views/parameters.py b/bigchaindb/web/views/parameters.py
index 9968a659..222adb97 100644
--- a/bigchaindb/web/views/parameters.py
+++ b/bigchaindb/web/views/parameters.py
@@ -17,7 +17,7 @@ def valid_bool(val):
 
 def valid_ed25519(key):
     if (re.match('^[1-9a-zA-Z]{43,44}$', key) and not
-        re.match('.*[Il0O]', key)):
+       re.match('.*[Il0O]', key)):
         return key
     raise ValueError("Invalid base58 ed25519 key")
 
diff --git a/bigchaindb/web/views/transactions.py b/bigchaindb/web/views/transactions.py
index bc828df7..a2b6cd30 100644
--- a/bigchaindb/web/views/transactions.py
+++ b/bigchaindb/web/views/transactions.py
@@ -5,7 +5,6 @@ For more information please refer to the documentation on ReadTheDocs:
    http-client-server-api.html
 """
 import logging
-import re
 
 from flask import current_app, request
 from flask_restful import Resource, reqparse
diff --git a/tests/test_txlist.py b/tests/test_txlist.py
index 6f9f203a..e7de8c98 100644
--- a/tests/test_txlist.py
+++ b/tests/test_txlist.py
@@ -28,9 +28,8 @@ def txlist(b, user_pk, user2_pk, user_sk, user2_sk, genesis_block):
     b.write_block(block2)
 
     # Create block with double spend
-    tx_doublespend = Transaction.transfer(create1.to_inputs(),
-                                   [([user_pk], 9)],
-                                   create1.id).sign([user2_sk])
+    tx_doublespend = Transaction.transfer(create1.to_inputs(), [([user_pk], 9)],
+                                          create1.id).sign([user2_sk])
     block_doublespend = b.create_block([tx_doublespend])
     b.write_block(block_doublespend)
 
@@ -43,7 +42,7 @@ def txlist(b, user_pk, user2_pk, user_sk, user2_sk, genesis_block):
 
     # Create undecided block
     untx = Transaction.create([user_pk], [([user2_pk], 7)]) \
-                       .sign([user_sk])
+        .sign([user_sk])
     block_undecided = b.create_block([untx])
     b.write_block(block_undecided)
 
diff --git a/tests/web/test_parameters.py b/tests/web/test_parameters.py
index 4044a273..d39c6f38 100644
--- a/tests/web/test_parameters.py
+++ b/tests/web/test_parameters.py
@@ -22,8 +22,8 @@ def test_valid_txid():
 def test_valid_bool():
     from bigchaindb.web.views.parameters import valid_bool
 
-    assert valid_bool('true') == True
-    valid_bool('false') == False
+    assert valid_bool('true') is True
+    assert valid_bool('false') is False
 
     with pytest.raises(ValueError):
         valid_bool('TRUE')
diff --git a/tests/web/test_transactions.py b/tests/web/test_transactions.py
index f40bc924..fb0f8cb2 100644
--- a/tests/web/test_transactions.py
+++ b/tests/web/test_transactions.py
@@ -1,6 +1,6 @@
 import builtins
 import json
-from unittest.mock import Mock, patch
+from unittest.mock import patch
 
 import pytest
 from bigchaindb.common import crypto
@@ -185,6 +185,7 @@ def test_post_invalid_transfer_transaction_returns_400(b, client, user_pk):
 
 def test_transactions_get_list_good(client):
     from functools import partial
+
     def gtf(conn, **args):
         return [type('', (), {'to_dict': partial(lambda a: a, arg)})
                 for arg in sorted(args.items())]
@@ -205,6 +206,8 @@ def test_transactions_get_list_good(client):
 
 
 def test_transactions_get_list_bad(client):
+    def should_not_be_called():
+        assert False
     with patch('bigchaindb.core.Bigchain.get_transactions_filtered',
                lambda *_, **__: should_not_be_called()):
         # Test asset id validated