BUG: fixed on issue #55 with single history bar

catalyst/exchange/exchange_bundle.py

@@ -435,7 +435,7 @@ class ExchangeBundle:
         if end is None or (last_entry is not None and end > last_entry):
             end = last_entry
 
-        if end is None or start is None or start >= end:
+        if end is None or start is None or start > end:
             raise NoDataAvailableOnExchange(
                 exchange=[asset.exchange for asset in assets],
                 symbol=[asset.symbol for asset in assets],

catalyst/support/issue_55.py

@@ -19,11 +19,11 @@ def handle_data(context, data):
     try:
         prices = data.history(
             context.asset,
-            fields='price',
+            fields='close',
             bar_count=1,
             frequency='1D'
         )
-        print('got {} price entries'.format(len(prices)))
+        print('got {} price entries\n'.format(len(prices), prices))
     except Exception as e:
         print(e)