diff --git a/n2vc/exceptions.py b/n2vc/exceptions.py
index 815d4ea..09f3573 100644
--- a/n2vc/exceptions.py
+++ b/n2vc/exceptions.py
@@ -41,7 +41,7 @@
     """The authentication for the specified user failed."""
 
 
-class NotImplemented(Exception):
+class MethodNotImplemented(Exception):
     """The method is not implemented."""
 
 
@@ -50,7 +50,7 @@
     N2VC exception base class
     """
 
-    def __init__(self, message: str = ''):
+    def __init__(self, message: str = ""):
         Exception.__init__(self, message)
         self.message = message
 
@@ -58,7 +58,7 @@
         return self.message
 
     def __repr__(self):
-        return '{}({})'.format(type(self), self.message)
+        return "{}({})".format(type(self), self.message)
 
 
 class N2VCBadArgumentsException(N2VCException):
@@ -66,12 +66,14 @@
     Bad argument values exception
     """
 
-    def __init__(self, message: str = '', bad_args: list = None):
+    def __init__(self, message: str = "", bad_args: list = None):
         N2VCException.__init__(self, message=message)
         self.bad_args = bad_args
 
     def __str__(self):
-        return '<{}> Bad arguments: {} -> {}'.format(type(self), super().__str__(), self.bad_args)
+        return "<{}> Bad arguments: {} -> {}".format(
+            type(self), super().__str__(), self.bad_args
+        )
 
 
 class N2VCConnectionException(N2VCException):
@@ -79,12 +81,14 @@
     Error connecting to VCA
     """
 
-    def __init__(self, message: str = '', url: str = None):
+    def __init__(self, message: str = "", url: str = None):
         N2VCException.__init__(self, message=message)
         self.url = url
 
     def __str__(self):
-        return '<{}> Connection to {} failed: {}'.format(type(self), self.url, super().__str__())
+        return "<{}> Connection to {} failed: {}".format(
+            type(self), self.url, super().__str__()
+        )
 
 
 class N2VCTimeoutException(N2VCException):
@@ -92,12 +96,12 @@
     Timeout
     """
 
-    def __init__(self, message: str = '', timeout: str = ''):
+    def __init__(self, message: str = "", timeout: str = ""):
         N2VCException.__init__(self, message=message)
         self.timeout = timeout
 
     def __str__(self):
-        return '<{}> {} timeout: {}'.format(type(self), self.timeout, super().__str__())
+        return "<{}> {} timeout: {}".format(type(self), self.timeout, super().__str__())
 
 
 class N2VCExecutionException(N2VCException):
@@ -105,12 +109,14 @@
     Error executing primitive
     """
 
-    def __init__(self, message: str = '', primitive_name: str = ''):
+    def __init__(self, message: str = "", primitive_name: str = ""):
         N2VCException.__init__(self, message=message)
         self.primitive_name = primitive_name
 
     def __str__(self):
-        return '<{}> Error executing primitive {} failed: {}'.format(type(self), self.primitive_name, super().__str__())
+        return "<{}> Error executing primitive {} failed: {}".format(
+            type(self), self.primitive_name, super().__str__()
+        )
 
 
 class N2VCInvalidCertificate(N2VCException):
@@ -118,11 +124,11 @@
     Invalid certificate
     """
 
-    def __init__(self, message: str = ''):
+    def __init__(self, message: str = ""):
         N2VCException.__init__(self, message=message)
 
     def __str__(self):
-        return '<{}> Invalid certificate: {}'.format(type(self), super().__str__())
+        return "<{}> Invalid certificate: {}".format(type(self), super().__str__())
 
 
 class N2VCNotFound(N2VCException):
@@ -130,11 +136,11 @@
     Not found
     """
 
-    def __init__(self, message: str = ''):
+    def __init__(self, message: str = ""):
         N2VCException.__init__(self, message=message)
 
     def __str__(self):
-        return '<{}> Not found: {}'.format(type(self), super().__str__())
+        return "<{}> Not found: {}".format(type(self), super().__str__())
 
 
 class K8sException(Exception):