diff --git a/zipline/utils/calendars/calendar_utils.py b/zipline/utils/calendars/calendar_utils.py
index <HASH>..<HASH> 100644
--- a/zipline/utils/calendars/calendar_utils.py
+++ b/zipline/utils/calendars/calendar_utils.py
@@ -33,6 +33,7 @@ _default_calendar_aliases = {
     'ICEUS': 'ICE',
     'NYFE': 'ICE',
 }
+default_calendar_names = sorted(_default_calendar_factories.keys())
 
 
 class TradingCalendarDispatcher(object):
BUG/ENH: Allow users to switch between calendars (#<I>)

* BUG: Allow users to switch between calendars



You previously could not switch between different calendars because

the `trading_calendar` parameter was not being passed into run_algo

or `TradingAlgorithm`. You now can pass which calendar you'd like to

use via the CLI using `--trading-calendar`.



* DEV/MAINT: Add pdb++ and change fixtures variable