Merge branch 'develop'

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

@@ -0,0 +1,42 @@
+import talib
+import pandas as pd
+
+from catalyst import run_algorithm
+from catalyst.api import symbol
+
+
+def initialize(context):
+    print('initializing')
+    context.asset = symbol('xcp_btc')
+
+
+def handle_data(context, data):
+    print('handling bar: {}'.format(data.current_dt))
+
+    price = data.current(context.asset, 'close')
+    print('got price {price}'.format(price=price))
+
+    try:
+        prices = data.history(
+            context.asset,
+            fields='close',
+            bar_count=1,
+            frequency='1D'
+        )
+        print('got {} price entries\n'.format(len(prices), prices))
+    except Exception as e:
+        print(e)
+
+
+run_algorithm(
+    capital_base=1,
+    start=pd.to_datetime('2015-3-2', utc=True),
+    end=pd.to_datetime('2017-8-31', utc=True),
+    data_frequency='daily',
+    initialize=initialize,
+    handle_data=handle_data,
+    analyze=None,
+    exchange_name='poloniex',
+    algo_namespace='issue_55',
+    base_currency='btc'
+)

docs/source/releases.rst

@@ -2,9 +2,18 @@
 Release Notes
 =============
 
+Version 0.3.6
+^^^^^^^^^^^^^
+**Release Date**: 2017-11-4
+
+Bug Fixes
+~~~~~~~~~
+
+- Fixed an issue with single bar data.history() (:issue:`55`)
+
 Version 0.3.5
 ^^^^^^^^^^^^^
-**Release Date**: 2017-11-2
+**Release Date**: 2017-11-4
 
 Bug Fixes
 ~~~~~~~~~