diff --git a/tangostationcontrol/tangostationcontrol/toolkit/archiver.py b/tangostationcontrol/tangostationcontrol/toolkit/archiver.py
index f68e291948d8048ef0b88f1bbedfb2c6194960eb..cea9a016a36c1ae2c037716d7817727ee587000e 100644
--- a/tangostationcontrol/tangostationcontrol/toolkit/archiver.py
+++ b/tangostationcontrol/tangostationcontrol/toolkit/archiver.py
@@ -373,7 +373,7 @@ class Archiver():
             es = DeviceProxy(es_name)
             attrs.extend(list(es.AttributeList or []))
             errs.extend(list(es.AttributeErrorList or []))
-        return dict((a,e) for a,e in zip(attrs,errs) if e) or {}
+        return {a: e for a,e in zip(attrs,errs) if e}
    
     def get_attribute_errors(self,attribute_name:str):
         """
@@ -419,7 +419,7 @@ class Archiver():
         attribute_name = attribute_name_from_url(attribute_name)
         if self.is_attribute_archived(attribute_name):
             es = DeviceProxy(self.get_attribute_subscriber(attribute_name))
-            freq_dict = dict((a,r) for a,r in zip(es.AttributeList,es.AttributeRecordFreqList))
+            freq_dict = {a: r for a,r in zip(es.AttributeList,es.AttributeRecordFreqList)}
             for f in freq_dict:
                 if attribute_name.lower() in f:
                     return freq_dict.get(f,0.)
@@ -433,7 +433,7 @@ class Archiver():
         attribute_name = attribute_name_from_url(attribute_name)
         if self.is_attribute_archived(attribute_name):
             es = DeviceProxy(self.get_attribute_subscriber(attribute_name))
-            fail_dict = dict((a,r) for a,r in zip(es.AttributeList,es.AttributeFailureFreqList))
+            fail_dict = {a: r for a,r in zip(es.AttributeList,es.AttributeFailureFreqList)}
             for f in fail_dict:
                 if attribute_name.lower() in f:
                     return fail_dict.get(f,0.)