diff --git a/edocument.py b/edocument.py
index d196140..395df5d 100644
--- a/edocument.py
+++ b/edocument.py
@@ -70,7 +70,7 @@ class XRechnung(EdocumentMixin, Invoice):
             else:
                 raise ValueError('invalid type-code "%s"' % self.type_code)
         else:
-            return super(XRechnung, self)._get_template(version)
+            return super()._get_template(version)
 
 # end XRechnung
 
@@ -92,6 +92,6 @@ class FacturX(EdocumentMixin, Invoice):
             else:
                 raise ValueError('invalid type-code "%s"' % self.type_code)
         else:
-            return super(FacturX, self)._get_template(version)
+            return super()._get_template(version)
 
 # end FacturX
diff --git a/mixin.py b/mixin.py
index abd7a20..16482e8 100644
--- a/mixin.py
+++ b/mixin.py
@@ -47,7 +47,7 @@ class EdocumentMixin(object):
         Returns:
             record : model party.address
         """
-        result = super(EdocumentMixin, self).seller_trade_address
+        result = super().seller_trade_address
         if not result:
             raise UserError(gettext(
                 'edocument_xrechnung.msg_no_seller_address',
@@ -75,7 +75,7 @@ class EdocumentMixin(object):
                 if self.invoice and self.invoice.party
                 else '-'))
 
-        result = super(EdocumentMixin, self).buyer_trade_address
+        result = super().buyer_trade_address
         if result and not result.country:
             raise UserError(gettext(
                 'edocument_xrechnung.msg_no_address_country',
diff --git a/party.py b/party.py
index cc020c6..1f09a66 100644
--- a/party.py
+++ b/party.py
@@ -45,7 +45,7 @@ class Party(metaclass=PoolMeta):
         Args:
             records (list): records of party.party
         """
-        super(Party, cls).validate(records)
+        super().validate(records)
         for record in records:
             record.get_xrechnung_route_id()
 
@@ -57,7 +57,7 @@ class PartyConfiguration(metaclass=PoolMeta):
 
     @classmethod
     def __setup__(cls):
-        super(PartyConfiguration, cls).__setup__()
+        super().__setup__()
         cls.identifier_types.selection.append(
                 ('edoc_route_id', 'X-Rechnung Route-ID'))