diff --git a/planetmint/backend/localmongodb/connection.py b/planetmint/backend/localmongodb/connection.py
index 359e553..f910f8d 100644
--- a/planetmint/backend/localmongodb/connection.py
+++ b/planetmint/backend/localmongodb/connection.py
@@ -42,7 +42,9 @@ class LocalMongoDBConnection(DBConnection):
         )
         self.crlfile = _kwargs_parser(key="crlfile", kwargs=kwargs) or dbconf["crlfile"]
         self.max_tries = _kwargs_parser(key="max_tries", kwargs=kwargs)
-        self.connection_timeout = _kwargs_parser(key="connection_timeout", kwargs=kwargs) or dbconf["connection_timeout"]
+        self.connection_timeout = (
+            _kwargs_parser(key="connection_timeout", kwargs=kwargs) or dbconf["connection_timeout"]
+        )
         self.__conn = None
         self.connect()
 
diff --git a/planetmint/config.py b/planetmint/config.py
index 7b93187..bfd44db 100644
--- a/planetmint/config.py
+++ b/planetmint/config.py
@@ -5,7 +5,7 @@ import os
 # from planetmint.log import DEFAULT_LOGGING_CONFIG as log_config
 from planetmint.version import __version__  # noqa
 from decouple import config
- 
+
 
 class Singleton(type):
     _instances = {}
@@ -27,7 +27,7 @@ class Config(metaclass=Singleton):
         # _base_database_localmongodb.keys() because dicts are unordered.
         # I tried to configure
         self.log_config = DEFAULT_LOGGING_CONFIG
-        db = config('PLANETMINT_DATABASE_BACKEND', default="tarantool_db")
+        db = config("PLANETMINT_DATABASE_BACKEND", default="tarantool_db")
         self.__private_database_keys_map = {  # TODO Check if it is working after removing 'name' field
             "tarantool_db": ("host", "port"),
             "localmongodb": ("host", "port", "name"),
diff --git a/tests/test_core.py b/tests/test_core.py
index 743327c..6a43b51 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -65,8 +65,9 @@ def test_bigchain_class_default_initialization(config):
 @pytest.mark.bdb
 def test_get_spent_issue_1271(b, alice, bob, carol):
     from planetmint import Planetmint
+
     planet = Planetmint()
-    print( f" CONNECTION HOST : {planet.connection.host}")
+    print(f" CONNECTION HOST : {planet.connection.host}")
     tx_1 = Create.generate(
         [carol.public_key],
         [([carol.public_key], 8)],