diff --git a/moulinette/interfaces/__init__.py b/moulinette/interfaces/__init__.py
index 3b2e69bd..01e57bcc 100644
--- a/moulinette/interfaces/__init__.py
+++ b/moulinette/interfaces/__init__.py
@@ -502,8 +502,8 @@ class _ExtendedSubParsersAction(argparse._SubParsersAction):
 class ExtendedArgumentParser(argparse.ArgumentParser):
 
     def __init__(self, *args, **kwargs):
-        super(ExtendedArgumentParser, self).__init__(
-                formatter_class=PositionalsFirstHelpFormatter, *args, **kwargs)
+        super(ExtendedArgumentParser, self).__init__(formatter_class=PositionalsFirstHelpFormatter,
+                                                     *args, **kwargs)
 
         # Register additional actions
         self.register('action', 'callback', _CallbackAction)
diff --git a/moulinette/utils/filesystem.py b/moulinette/utils/filesystem.py
index 737bdd18..bbea872c 100644
--- a/moulinette/utils/filesystem.py
+++ b/moulinette/utils/filesystem.py
@@ -9,6 +9,7 @@ from moulinette.core import MoulinetteError
 
 # Files & directories --------------------------------------------------
 
+
 def read_file(file_path):
     """
     Read a regular text file
@@ -94,6 +95,7 @@ def write_to_file(file_path, data, file_mode="w"):
                               m18n.g('error_writing_file',
                                      file=file_path, error=str(e)))
 
+
 def append_to_file(file_path, data):
     """
     Append a single string or a list of string to a text file.
diff --git a/moulinette/utils/process.py b/moulinette/utils/process.py
index 6475f056..e48f27a9 100644
--- a/moulinette/utils/process.py
+++ b/moulinette/utils/process.py
@@ -106,7 +106,7 @@ def call_async_output(args, callback, **kwargs):
 # Call multiple commands -----------------------------------------------
 
 def run_commands(cmds, callback=None, separate_stderr=False, shell=True,
-                  **kwargs):
+                 **kwargs):
     """Run multiple commands with error management
 
     Run a list of commands and allow to manage how to treat errors either
diff --git a/moulinette/utils/tests/conftest.py b/moulinette/utils/tests/conftest.py
index 2bc5b2b5..515804ef 100644
--- a/moulinette/utils/tests/conftest.py
+++ b/moulinette/utils/tests/conftest.py
@@ -9,9 +9,13 @@ sys.path.append("..")
 
 
 old_init = moulinette.core.Moulinette18n.__init__
+
+
 def monkey_path_i18n_init(self, package, default_locale="en"):
     old_init(self, package, default_locale)
     self.load_namespace("moulinette")
+
+
 moulinette.core.Moulinette18n.__init__ = monkey_path_i18n_init
 
 
@@ -21,16 +25,23 @@ moulinette.core.Moulinette18n.__init__ = monkey_path_i18n_init
 
 
 old_translate = moulinette.core.Translator.translate
+
+
 def new_translate(self, key, *args, **kwargs):
 
     if key not in self._translations[self.default_locale].keys():
         raise KeyError("Unable to retrieve key %s for default locale !" % key)
 
     return old_translate(self, key, *args, **kwargs)
+
+
 moulinette.core.Translator.translate = new_translate
 
+
 def new_m18nn(self, key, *args, **kwargs):
     return self._global.translate(key, *args, **kwargs)
+
+
 moulinette.core.Moulinette18n.g = new_m18nn
 
 
@@ -93,4 +104,3 @@ def pytest_cmdline_main(config):
 
     # Initialize moulinette
     moulinette.init(logging_config=logging, _from_source=False)
-
diff --git a/moulinette/utils/tests/test_filesystem.py b/moulinette/utils/tests/test_filesystem.py
index c79bee40..bf4b1345 100644
--- a/moulinette/utils/tests/test_filesystem.py
+++ b/moulinette/utils/tests/test_filesystem.py
@@ -3,16 +3,14 @@
 import os
 import pwd
 import pytest
-import requests
-import requests_mock
 
 # Moulinette specific
 from moulinette.core import MoulinetteError
-from moulinette.utils.filesystem import (
-        read_file, read_json,
-        write_to_file, append_to_file, write_to_json,
-        rm,
-        chmod, chown)
+from moulinette.utils.filesystem import (read_file, read_json,
+                                         write_to_file, append_to_file,
+                                         write_to_json,
+                                         rm,
+                                         chmod, chown)
 
 # We define a dummy context with test folders and files
 
@@ -61,7 +59,7 @@ def test_read_file():
 def test_read_file_badfile():
 
     with pytest.raises(MoulinetteError):
-        read_file(TMP_TEST_FILE+"nope")
+        read_file(TMP_TEST_FILE + "nope")
 
 
 def test_read_file_badpermissions():
@@ -295,5 +293,3 @@ def test_setpermissions_badgroup():
 
     with pytest.raises(MoulinetteError):
         set_permissions(TMP_TEST_FILE, NON_ROOT_USER, "foo", 0111)
-
-
diff --git a/moulinette/utils/tests/test_network.py b/moulinette/utils/tests/test_network.py
index 588f7a3c..fd7add78 100644
--- a/moulinette/utils/tests/test_network.py
+++ b/moulinette/utils/tests/test_network.py
@@ -1,7 +1,5 @@
 
 # General python lib
-import os
-import pwd
 import pytest
 import requests
 import requests_mock
@@ -14,10 +12,12 @@ from moulinette.utils.network import download_text, download_json
 
 TEST_URL = "https://some.test.url/yolo.txt"
 
+
 def setup_function(function):
 
     pass
 
+
 def teardown_function(function):
 
     pass
@@ -88,5 +88,3 @@ def test_download_json_badjson():
 
         with pytest.raises(MoulinetteError):
             download_json(TEST_URL)
-
-
diff --git a/moulinette/utils/tests/test_process.py b/moulinette/utils/tests/test_process.py
index a37a0f3b..da77f80d 100644
--- a/moulinette/utils/tests/test_process.py
+++ b/moulinette/utils/tests/test_process.py
@@ -39,6 +39,7 @@ def switch_to_non_root_user():
 #   Test run shell commands                                                   #
 ###############################################################################
 
+
 def test_run_shell_command_list():
 
     commands = ["rm -f %s" % TMP_TEST_FILE]
@@ -63,4 +64,3 @@ def test_run_shell_command_badpermissions():
     switch_to_non_root_user()
     with pytest.raises(CalledProcessError):
         run_commands(commands)
-