diff --git a/tiramisu_cmdline_parser/api.py b/tiramisu_cmdline_parser/api.py
index 2732036..4edc6c3 100644
--- a/tiramisu_cmdline_parser/api.py
+++ b/tiramisu_cmdline_parser/api.py
@@ -27,7 +27,12 @@ from gettext import gettext as _
 
 # try:
 from tiramisu import Config
-from tiramisu.error import PropertiesOptionError, LeadershipError, ConfigError, AttributeOptionError
+from tiramisu.error import (
+    PropertiesOptionError,
+    LeadershipError,
+    ConfigError,
+    AttributeOptionError,
+)
 
 
 def get_choice_list(config, properties, display):
@@ -336,7 +341,9 @@ class TiramisuCmdlineParser(ArgumentParser):
         self.fullpath = fullpath
         self.config = config
         config_properties = config.property.get()
-        self.config_frozen = "frozen" in config_properties or "everything_frozen" in config_properties
+        self.config_frozen = (
+            "frozen" in config_properties or "everything_frozen" in config_properties
+        )
         self.root = root
         self.remove_empty_od = remove_empty_od
         self.unrestraint = unrestraint
@@ -361,7 +368,9 @@ class TiramisuCmdlineParser(ArgumentParser):
         else:
             subconfig = subconfig.option(self.root)
         self.namespace = TiramisuNamespace(self.config, self.root)
-        super().__init__(*args, add_help=add_help, exit_on_error=exit_on_error, **kwargs)
+        super().__init__(
+            *args, add_help=add_help, exit_on_error=exit_on_error, **kwargs
+        )
         self.register("action", "help", _TiramisuHelpAction)
         self._config_to_argparser(
             _forhelp,
@@ -692,7 +701,11 @@ class TiramisuCmdlineParser(ArgumentParser):
                     kwargs["type"] = float
                 else:
                     pass
-                if not _forhelp and option.type() != "boolean" and "nargs" not in kwargs.kwargs:
+                if (
+                    not _forhelp
+                    and option.type() != "boolean"
+                    and "nargs" not in kwargs.kwargs
+                ):
                     kwargs["nargs"] = "?"
             actions.setdefault(kwargs.ga_name, []).append(kwargs)
 
@@ -705,9 +718,11 @@ class TiramisuCmdlineParser(ArgumentParser):
             group.add_argument(*args, **kwargs)
 
     def parse_args(self, *args, valid_mandatory=True, **kwargs):
-        namespaces, unknown = self.parse_known_args(*args, valid_mandatory=valid_mandatory, **kwargs)
+        namespaces, unknown = self.parse_known_args(
+            *args, valid_mandatory=valid_mandatory, **kwargs
+        )
         if unknown:
-            msg_unknown = 'unrecognized arguments: %s' % ' '.join(unknown)
+            msg_unknown = "unrecognized arguments: %s" % " ".join(unknown)
             if self.exit_on_error:
                 self.error(msg_unknown)
             else: