diff --git a/python/fbprophet/make_holidays.py b/python/fbprophet/make_holidays.py
index 7da7095..27b3c49 100644
--- a/python/fbprophet/make_holidays.py
+++ b/python/fbprophet/make_holidays.py
@@ -34,9 +34,9 @@ def get_holiday_names(country):
     except AttributeError:
         try:
             holiday_names = getattr(hdays_part1, country)(years=years).values()
-        except AttributeError:
+        except AttributeError as e:
             raise AttributeError(
-                "Holidays in {} are not currently supported!".format(country))
+                "Holidays in {} are not currently supported!".format(country)) from e
     return set(holiday_names)
 
 
@@ -58,9 +58,9 @@ def make_holidays_df(year_list, country, province=None):
     except AttributeError:
         try:
             holidays = getattr(hdays_part1, country)(prov=province,years=year_list)
-        except AttributeError:
+        except AttributeError as e:
             raise AttributeError(
-                "Holidays in {} are not currently supported!".format(country))
+                "Holidays in {} are not currently supported!".format(country)) from e
     holidays_df = pd.DataFrame(list(holidays.items()), columns=['ds', 'holiday'])
     holidays_df.reset_index(inplace=True, drop=True)
     holidays_df['ds'] = pd.to_datetime(holidays_df['ds'])
diff --git a/python/fbprophet/models.py b/python/fbprophet/models.py
index de03333..dc77a6b 100644
--- a/python/fbprophet/models.py
+++ b/python/fbprophet/models.py
@@ -271,5 +271,5 @@ class StanBackendEnum(Enum):
     def get_backend_class(name: str) -> IStanBackend:
         try:
             return StanBackendEnum[name].value
-        except KeyError:
-            raise ValueError("Unknown stan backend: {}".format(name))
+        except KeyError as e:
+            raise ValueError("Unknown stan backend: {}".format(name)) from e