diff --git a/pya2l/classes.py b/pya2l/classes.py
index cc03c59..3eeb43b 100644
--- a/pya2l/classes.py
+++ b/pya2l/classes.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
 
 __copyright__ = """
     pySART - Simplified AUTOSAR-Toolkit for Python.
@@ -25,8 +24,6 @@
 
 from collections import namedtuple
 
-import six
-
 from pya2l.utils import SingletonBase
 
 
@@ -36,11 +33,11 @@ def camel_case(name, upper_first=True):
     result.append(splitty[0])
     if len(splitty) > 1:
         for part in splitty[1:]:
-            xxx = "{0}{1}".format(part[0].upper(), part[1:])
+            xxx = f"{part[0].upper()}{part[1:]}"
             result.append(xxx)
     result = "".join(result)
     if upper_first:
-        result = "{}{}".format(result[0].upper(), result[1:])
+        result = f"{result[0].upper()}{result[1:]}"
     return result
 
 
@@ -165,8 +162,7 @@ def getClass(metacls, name):
         return result
 
 
-@six.add_metaclass(KeywordType)
-class Keyword(object):
+class Keyword(metaclass=KeywordType):
 
     multiple = False
     block = False
@@ -180,7 +176,7 @@ def attributeNames(cls):
         return [attr[1] for attr in cls.attrs if MULTIPLE not in attr]
 
     def __str__(self):
-        return "< %s @%0X >" % (self.__class__.__name__, id(self))
+        return f"< {self.__class__.__name__} @{id(self):0X} >"
 
     @classmethod
     def class_name(cls):
@@ -2073,7 +2069,7 @@ class RootElement(Keyword):
 }
 
 
-class A2LElement(object):
+class A2LElement:
     def __str__(self):
         result = []
         result.append("%s {" % self.__class__.__name__)
diff --git a/pya2l/parserlib.py b/pya2l/parserlib.py
index 401d2ab..91dfa94 100644
--- a/pya2l/parserlib.py
+++ b/pya2l/parserlib.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
 
 __copyright__ = """
    pySART - Simplified AUTOSAR-Toolkit for Python.
@@ -27,20 +26,22 @@
 __author__ = "Christoph Schueler"
 __version__ = "0.1.0"
 
-from collections import namedtuple
 import importlib
 import sys
-
-import antlr4
-from antlr4.error.ErrorListener import ErrorListener
-from antlr4.atn.ParserATNSimulator import ParserATNSimulator
+from collections import namedtuple
 
 from pya2l import model
 
 
+# import antlr4
+# from antlr4.error.ErrorListener import ErrorListener
+# from antlr4.atn.ParserATNSimulator import ParserATNSimulator
+
+
 ResultType = namedtuple("ResultType", "db listener_result")
 
 
+'''
 class MyErrorListener(ErrorListener):
     """ """
 
@@ -58,6 +59,7 @@ def syntaxError(self, recognizer, offendingSymbol, line, column, msg, e):
             )
         else:
             print("line " + str(line) + ":" + str(column) + " " + msg, file=sys.stderr)
+'''
 
 
 class ParserWrapper:
@@ -82,8 +84,8 @@ def __init__(
         self.listener = listener
 
     def _load(self, name):
-        className = "{0}{1}".format(self.grammarName, name)
-        moduleName = "pya2l.{0}".format(className)
+        className = f"{self.grammarName}{name}"
+        moduleName = f"pya2l.{className}"
         module = importlib.import_module(moduleName)
         klass = getattr(module, className)
         return (
diff --git a/pya2l/parsers.py b/pya2l/parsers.py
index aa68fdf..df24302 100644
--- a/pya2l/parsers.py
+++ b/pya2l/parsers.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
 
 __copyright__ = """
    pySART - Simplified AUTOSAR-Toolkit for Python.
@@ -26,10 +25,13 @@
 """
 __author__ = "Christoph Schueler"
 
-from pya2l.aml.listener import AMLListener
-from pya2l.parserlib import ParserWrapper
 from pya2l.a2lparser import A2LParser
-from pya2l.if_data_parser import IfDataParser
+
+# from pya2l.aml.listener import AMLListener
+from pya2l.parserlib import ParserWrapper
+
+
+# from pya2l.if_data_parser import IfDataParser
 
 
 def aml(debug: bool = False, prepro_result=None):