Satisfy new pylint rule raise-missing-from

DiamondLightSource · Sep 18, 2020 · 234c42a · 234c42a
1 parent a595d3c
commit 234c42a
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/aa/fetcher.py b/aa/fetcher.py
@@ -62,9 +62,9 @@ def get_event_at(self, pv, instant, request_params=None):
         try:
             return self.get_values(pv, instant, instant, 1,
                                    request_params).get_event(0)
-        except IndexError:
+        except IndexError as e:
             error_msg = 'No data found for pv {} at timestamp {}'
-            raise ValueError(error_msg.format(pv, instant))
+            raise ValueError(error_msg.format(pv, instant)) from e
 
 
 class AaFetcher(Fetcher):