[dataformats][api] Fix key search in dictionary

beat/web/dataformats/api.py

@@ -114,14 +114,14 @@ class RetrieveUpdateDestroyDataFormatsView(RetrieveUpdateDestroyContributionView
             if not data:
                 raise serializers.ValidationError({'data': 'Empty'})
 
-        if data.has_key('short_description'):
+        if 'short_description' in data:
             if not(isinstance(data['short_description'], six.string_types)):
                 raise serializers.ValidationError({'short_description': 'Invalid short_description data'})
             short_description = data['short_description']
         else:
             short_description = None
 
-        if data.has_key('description'):
+        if 'description' in data:
             if not(isinstance(data['description'], six.string_types)):
                 raise serializers.ValidationError({'description': 'Invalid description data'})
             description = data['description']
@@ -132,7 +132,7 @@ class RetrieveUpdateDestroyDataFormatsView(RetrieveUpdateDestroyContributionView
         else:
             description = None
 
-        if data.has_key('declaration'):
+        if 'declaration' in data:
             if isinstance(data['declaration'], dict):
                 json_declaration = data['declaration']
                 declaration = json.dumps(json_declaration, indent=4)
@@ -145,7 +145,7 @@ class RetrieveUpdateDestroyDataFormatsView(RetrieveUpdateDestroyContributionView
             else:
                 raise serializers.ValidationError({'declaration': 'Invalid declaration data'})
 
-            if json_declaration.has_key('#description'):
+            if '#description' in json_declaration:
                 if short_description is not None:
                     raise serializers.ValidationError({'short_description': 'A short description is already provided in the data format declaration'})
 
@@ -162,7 +162,7 @@ class RetrieveUpdateDestroyDataFormatsView(RetrieveUpdateDestroyContributionView
 
 
         # Process the query string
-        if request.GET.has_key('fields'):
+        if 'fields' in request.GET:
             fields_to_return = request.GET['fields'].split(',')
         else:
             # Available fields (not returned by default):