diff --git a/src/command_parser/flag.py b/src/command_parser/flag.py
index 81ff531..8ddfa81 100644
--- a/src/command_parser/flag.py
+++ b/src/command_parser/flag.py
@@ -1,7 +1,13 @@
 from command_parser.option import Option
 
+
 class Flag(Option):
-    def __init__(self, name: str, default: bool = False, single_char: str | None = None) -> None:
+    def __init__(
+        self,
+        name: str,
+        default: bool = False,
+        single_char: str | None = None,
+    ) -> None:
         super(Flag, self).__init__(name, single_char)
         self.value = default
 
diff --git a/src/command_parser/option.py b/src/command_parser/option.py
index c8898cc..e93f33f 100644
--- a/src/command_parser/option.py
+++ b/src/command_parser/option.py
@@ -1,10 +1,11 @@
 from command_parser import logger
 
+
 class Option:
-    def __init__(self, name: str, single_char: str | None = None) -> None:
-        logger.debug(
-            _("creating new option with the name {name}")
-        )
+    def __init__(
+        self, name: str, single_char: str | None = None
+    ) -> None:
+        logger.debug(_("creating new option with the name {name}"))
         if single_char is None:
             logger.debug(
                 _(
@@ -18,12 +19,10 @@ class Option:
                     _(
                         "char representation should be only one char "
                         + "long"
-                      )
+                    )
                 )
             logger.debug(
-                _(
-                    "single char {char} defined"
-                ).format(char = single_char)
+                _("single char {char} defined").format(char=single_char)
             )
         self.name = name
         self.single_char = single_char
diff --git a/src/command_parser/parser.py b/src/command_parser/parser.py
index 9466bf2..5dde734 100644
--- a/src/command_parser/parser.py
+++ b/src/command_parser/parser.py
@@ -3,6 +3,7 @@ from command_parser import logger
 from command_parser.flag import Flag
 from command_parser.value import Value
 
+
 def parse(line: str, flags: list[Flag], values: list[Value]):
     """
     parse a command line parser
@@ -46,7 +47,7 @@ def parse(line: str, flags: list[Flag], values: list[Value]):
                         index += 1
                 for value in values:
                     if value.long() == element[: len(value.long())]:
-                        value.apply(element[len(value.long()):])
+                        value.apply(element[len(value.long()) :])
                         index += 1
         except IndexError:
             logger.warning(_("empty value"))
diff --git a/src/command_parser/value.py b/src/command_parser/value.py
index 7696e54..6bcc89b 100644
--- a/src/command_parser/value.py
+++ b/src/command_parser/value.py
@@ -15,14 +15,14 @@ class Value(Option):
         if allowlist is None:
             logger.debug(
                 _("every values is accepted for {option}").format(
-                    option = self.name,
+                    option=self.name,
                 )
             )
         else:
             logger.debug(
                 _(
                     "only some values is accepted for {option}".format(
-                        option = self.name
+                        option=self.name
                     )
                 )
             )
@@ -43,7 +43,7 @@ class Value(Option):
                         "{value} is not an accepted value for the "
                         + "option {option}"
                     ).format(
-                        value = value,
-                        option = self.name,
+                        value=value,
+                        option=self.name,
                     )
                 )