diff --git a/README.md b/README.md
index ee0fe44a..2e7e2fb6 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@
  
 ![Version](https://img.shields.io/github/v/tag/yunohost/moulinette?label=version&sort=semver)
 [![Tests status](https://github.com/YunoHost/moulinette/actions/workflows/tox.yml/badge.svg)](https://github.com/YunoHost/moulinette/actions/workflows/tox.yml)
+[![Language grade: Python](https://img.shields.io/lgtm/grade/python/g/YunoHost/moulinette.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/YunoHost/moulinette/context:python)
 [![GitHub license](https://img.shields.io/github/license/YunoHost/moulinette)](https://github.com/YunoHost/moulinette/blob/dev/LICENSE)
 
  
diff --git a/moulinette/interfaces/__init__.py b/moulinette/interfaces/__init__.py
index d7753eae..02e0447b 100644
--- a/moulinette/interfaces/__init__.py
+++ b/moulinette/interfaces/__init__.py
@@ -331,7 +331,7 @@ class ExtendedArgumentParser(argparse.ArgumentParser):
             c.execute(namespace, v)
         try:
             delattr(namespace, CALLBACKS_PROP)
-        except:
+        except AttributeError:
             pass
 
     def _get_callbacks_queue(self, namespace, create=True):
diff --git a/moulinette/interfaces/api.py b/moulinette/interfaces/api.py
index abc0fd93..60d85ec7 100644
--- a/moulinette/interfaces/api.py
+++ b/moulinette/interfaces/api.py
@@ -237,6 +237,7 @@ class Session:
     secret = random_ascii()
     actionsmap_name = None  # This is later set to the actionsmap name
 
+    @staticmethod
     def set_infos(infos):
 
         assert isinstance(infos, dict)
@@ -250,6 +251,7 @@ class Session:
             # samesite="strict", # Bottle 0.12 doesn't support samesite, to be added in next versions
         )
 
+    @staticmethod
     def get_infos(raise_if_no_session_exists=True):
 
         try:
@@ -673,13 +675,14 @@ class ActionsMapParser(BaseActionsMapParser):
 
         return parser.authentication
 
-    def parse_args(self, args, route, **kwargs):
+    def parse_args(self, args, **kwargs):
         """Parse arguments
 
         Keyword arguments:
             - route -- The action route as a 2-tuple (method, path)
 
         """
+        route = kwargs["route"]
         try:
             # Retrieve the parser for the route
             _, parser = self._parsers[route]
diff --git a/moulinette/utils/log.py b/moulinette/utils/log.py
index 283c121e..02f8a30a 100644
--- a/moulinette/utils/log.py
+++ b/moulinette/utils/log.py
@@ -1,5 +1,4 @@
 import os
-import logging
 
 # import all constants because other modules try to import them from this
 # module because SUCCESS is defined in this module
@@ -70,8 +69,11 @@ def configure_logging(logging_config=None):
 
 def getHandlersByClass(classinfo, limit=0):
     """Retrieve registered handlers of a given class."""
+
+    from logging import _handlers
+
     handlers = []
-    for ref in logging._handlers.itervaluerefs():
+    for ref in _handlers.itervaluerefs():
         o = ref()
         if o is not None and isinstance(o, classinfo):
             if limit == 1:
@@ -102,14 +104,17 @@ class MoulinetteLogger(Logger):
 
     def findCaller(self, *args):
         """Override findCaller method to consider this source file."""
-        f = logging.currentframe()
+
+        from logging import currentframe, _srcfile
+
+        f = currentframe()
         if f is not None:
             f = f.f_back
         rv = "(unknown file)", 0, "(unknown function)"
         while hasattr(f, "f_code"):
             co = f.f_code
             filename = os.path.normcase(co.co_filename)
-            if filename == logging._srcfile or filename == __file__:
+            if filename == _srcfile or filename == __file__:
                 f = f.f_back
                 continue
             rv = (co.co_filename, f.f_lineno, co.co_name)