API: DataFrame/Panel sources expect integer sids, not identifiers

This commit modifies the DataFrameSource and DataPanelSource to accept only Int64Indexes on the incoming data and moves the burden of mapping user identifiers to TradingAlgorithm.run().

tests/test_sources.py

@@ -27,6 +27,7 @@ from zipline.sources import (DataFrameSource,
                              RandomWalkSource)
 from zipline.utils import tradingcalendar as calendar_nyse
 from zipline.finance.trading import with_environment
+from zipline.assets import AssetFinder
 
 
 class TestDataFrameSource(TestCase):
@@ -43,7 +44,7 @@ class TestDataFrameSource(TestCase):
 
     def test_df_sid_filtering(self):
         _, df = factory.create_test_df_source()
-        source = DataFrameSource(df, sids=[0])
+        source = DataFrameSource(df)
         assert 1 not in [event.sid for event in source], \
             "DataFrameSource should only stream selected sid 0, not sid 1."
 
@@ -63,8 +64,8 @@ class TestDataFrameSource(TestCase):
             self.assertTrue(isinstance(event['volume'], int))
             self.assertTrue(isinstance(event['arbitrary'], float))
 
-    @with_environment()
-    def test_yahoo_bars_to_panel_source(self, env=None):
+    def test_yahoo_bars_to_panel_source(self):
+        finder = AssetFinder()
         stocks = ['AAPL', 'GE']
         start = pd.datetime(1993, 1, 1, 0, 0, 0, 0, pytz.utc)
         end = pd.datetime(2002, 1, 1, 0, 0, 0, 0, pytz.utc)
@@ -75,10 +76,15 @@ class TestDataFrameSource(TestCase):
 
         check_fields = ['sid', 'open', 'high', 'low', 'close',
                         'volume', 'price']
-        source = DataPanelSource(data)
+
+        copy_panel = data.copy()
+        copy_panel.items = finder.map_identifier_list_to_sids(
+            data.items, data.major_axis[0]
+        )
+        source = DataPanelSource(copy_panel)
         sids = [
             asset.sid for asset in
-            [env.asset_finder.lookup_symbol(symbol, as_of_date=end)
+            [finder.lookup_symbol(symbol, as_of_date=end)
              for symbol in stocks]
         ]
         stocks_iter = cycle(sids)