diff --git a/setup.py b/setup.py
index 11bc12d..fd307e0 100644
--- a/setup.py
+++ b/setup.py
@@ -12,6 +12,8 @@
 from os.path import splitext
 from setuptools import setup
 
+changelog_url = 'https://github.com/ZigRazor/PyStateMachine/blob/master/CHANGELOG.md'
+
 
 def read(*names, **kwargs):
     with io.open(
@@ -27,7 +29,10 @@ def read(*names, **kwargs):
     license='GNU GENERAL PUBLIC LICENSE',
     description='PyStateMachine Package',
     long_description='%s\n%s' % (
-        re.compile('^.. start-badges.*^.. end-badges', re.M | re.S).sub('', read('README.md')),
+        re.compile(
+            '^.. start-badges.*^.. end-badges',
+            re.M | re.S
+        ).sub('', read('README.md')),
         re.sub(':[a-z]+:`~?(.*?)`', r'``\1``', read('CHANGELOG.md'))
     ),
     author='ZigRazor',
@@ -40,7 +45,8 @@ def read(*names, **kwargs):
     include_package_data=True,
     zip_safe=False,
     classifiers=[
-        # complete classifier list: http://pypi.python.org/pypi?%3Aaction=list_classifiers
+        # complete classifier list:
+        # http://pypi.python.org/pypi?%3Aaction=list_classifiers
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: GNU GENERAL PUBLIC LICENSE',
@@ -61,7 +67,7 @@ def read(*names, **kwargs):
         'Topic :: Utilities',
     ],
     project_urls={
-        'Changelog': 'https://github.com/ZigRazor/PyStateMachine/blob/master/CHANGELOG.md',
+        'Changelog': changelog_url,
         'Issue Tracker': 'https://github.com/ZigRazor/PyStateMachine/issues',
     },
     keywords=[
@@ -86,4 +92,4 @@ def read(*names, **kwargs):
             'nameless = nameless.cli:main',
         ]
     },
-)
\ No newline at end of file
+)
diff --git a/src/Event.py b/src/Event.py
index d68e9b1..0992afc 100644
--- a/src/Event.py
+++ b/src/Event.py
@@ -5,7 +5,14 @@
 class Event:
     """Construct an Event class"""
 
-    def __init__(self, name: str, to_state: str, pre_conditions: Conditions, post_conditions: Conditions, pre_actions: Actions, post_actions: Actions):
+    def __init__(
+        self, name: str,
+        to_state: str,
+        pre_conditions: Conditions,
+        post_conditions: Conditions,
+        pre_actions: Actions,
+        post_actions: Actions
+    ):
         """Initialize Event Class"""
         self.name = name
         self.to_state = to_state
diff --git a/src/ReadStateMachine.py b/src/ReadStateMachine.py
index cbb5aab..de535ed 100644
--- a/src/ReadStateMachine.py
+++ b/src/ReadStateMachine.py
@@ -110,7 +110,13 @@ def ReadStateMachineFile(xml_file: str):
                             post_actions = Actions(post_action_elements)
 
                     events[event_name] = Event(
-                        event_name, to_state, pre_conditions, post_conditions, pre_actions, post_actions)
+                        event_name,
+                        to_state,
+                        pre_conditions,
+                        post_conditions,
+                        pre_actions,
+                        post_actions
+                    )
                     # print(event.to_string())
                 elif state_child.tag == "Name":
                     # print("Name element = ", state_child.text)
diff --git a/src/StateMachine.py b/src/StateMachine.py
index 37ed5a1..7adc238 100644
--- a/src/StateMachine.py
+++ b/src/StateMachine.py
@@ -10,7 +10,8 @@ class StateMachine:
         xml_file (str): The name of the xml that defines the state machine.
         states (list): list of possible states of the machine.
         current_state (str): the current state of the machine.
-        context (dict): dictionary that contains the imported module at runtime for state machine operations.
+        context (dict): dictionary that contains the imported module
+            at runtime for state machine operations.
         saved_state (list): list of variables for restore state in case of rollback.
     """
     def __init__(self, xml_file: str):
@@ -25,8 +26,11 @@ def __init__(self, xml_file: str):
         self.current_state = ""
         self.context = {}
         self.saved_state = None
-        logging.basicConfig(filename=xml_file.split(sep=".xml")[
-                            0] + '.log', format='%(asctime)s - %(levelname)s - %(message)s', level=logging.DEBUG)
+        logging.basicConfig(
+            filename=xml_file.split(sep=".xml")[0] + '.log',
+            format='%(asctime)s - %(levelname)s - %(message)s',
+            level=logging.DEBUG
+        )
 
     def __CheckConditions(self, conditions):
         """
@@ -35,7 +39,8 @@ def __CheckConditions(self, conditions):
         Parameters:
            conditions (list): List of condition to check.
         Returns:
-            all_conditions_satisfied: a boolean that indicates if all conditions are satisfied
+            all_conditions_satisfied:
+                a boolean that indicates if all conditions are satisfied
         """
         all_conditions_satisfied = True
         if conditions is not None: