[plotters][serializers] Fix key search in dictionaries

beat/web/plotters/serializers.py

@@ -119,7 +119,7 @@ class PlotterParameterCreationSerializer(ContributionCreationSerializer):
     def create(self, validated_data):
         plotterparameter = None
 
-        if not validated_data.has_key("name"):
+        if "name" not in validated_data:
             raise serializers.ValidationError('No name provided')
 
         try:
@@ -130,7 +130,7 @@ class PlotterParameterCreationSerializer(ContributionCreationSerializer):
         if plotterparameter is not None:
             raise serializers.ValidationError('A plotterparameter with this name already exists')
 
-        if not self.data.has_key("plotter"):
+        if "plotter" not in self.data:
             raise serializers.ValidationError('No plotter provided')
 
         plotter = None
@@ -142,11 +142,11 @@ class PlotterParameterCreationSerializer(ContributionCreationSerializer):
         if plotter is None:
             raise serializers.ValidationError('Required plotter does not exist')
 
-        if not validated_data.has_key("data"):
+        if "data" not in validated_data:
             validated_data['data'] = {}
 
         #Only create new version for latest version
-        if validated_data.has_key("previous_version"):
+        if "previous_version" in validated_data:
             if validated_data['previous_version'].version < validated_data['version'] - 1:
                 raise serializers.ValidationError('A new version for this plotterparameter version already exist')
 
@@ -155,7 +155,7 @@ class PlotterParameterCreationSerializer(ContributionCreationSerializer):
             validated_data['description'] = validated_data['previous_version'].description
 
         #Create fork
-        if validated_data.has_key("fork_of"):
+        if "fork_of" in validated_data:
             #add description/short_description to new version
             validated_data['short_description'] = validated_data['fork_of'].short_description
             validated_data['description'] = validated_data['fork_of'].description